272 results on '"Sterlacchini, S"'
Search Results
2. The contribution of Geosciences in teaching of Civic Education in secondary schools: experiences of Citizen Science & Engagement in the context of the National Strategies for Sustainable Development (Strategie Aree Interne Valchiavenna)
- Author
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Bajni, G., Apuani, T., and Sterlacchini, S.
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Settore GEO/05 - Geologia Applicata - Published
- 2022
3. Choosing between linear and nonlinear models and avoiding overfitting for short and long term groundwater level forecasting in a linear system
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Zanotti, C, Rotiroti, M, Sterlacchini, S, Cappellini, G, Fumagalli, L, Stefania, G, Nannucci, M, Leoni, B, Bonomi, T, Zanotti C., Rotiroti M., Sterlacchini S., Cappellini G., Fumagalli L., Stefania G. A., Nannucci M. S., Leoni B., Bonomi T., Zanotti, C, Rotiroti, M, Sterlacchini, S, Cappellini, G, Fumagalli, L, Stefania, G, Nannucci, M, Leoni, B, Bonomi, T, Zanotti C., Rotiroti M., Sterlacchini S., Cappellini G., Fumagalli L., Stefania G. A., Nannucci M. S., Leoni B., and Bonomi T.
- Abstract
Groundwater level forecasting is a useful tool for a more efficient and sustainable groundwater resource management. Developing models that can accurately reproduce groundwater level response to meteorological conditions can lead to a better understanding of the groundwater resource availability. Here an autoregressive neural network (NNARx) approach is proposed and compared with autoregressive linear models with exogenous input (ARx) in order to forecast groundwater level in an aquifer system where a linear groundwater level response to recharge by rainfall is observed. A well known problem regarding neural networks consists in the high risk of overfitting. Here, three NNARx model were trained using different methods to avoid overfitting: Early stopping, Bayesian regularization and a combination of both. The results show that on the short term forecasting (up to 15 days) the performance of NNARx and ARx are comparable but the ARx model generalizes better, while the NNARx trained with Bayesian regularization outperforms the linear models and the other NNARx models on longer scenarios on the test set. As linear models are less time demanding and do not require high computational power, they can be considered as suitable tools for short term groundwater level forecasting in linear systems while when longer scenarios are needed neural networks can be considered more reliable, and training them with Bayesian regularization allows to minimize the risk of overfitting.
- Published
- 2019
4. The Use of the Weights-of-Evidence Modeling Technique to Estimate the Vulnerability of Groundwater to Nitrate Contamination
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Masetti, M., Poli, S., and Sterlacchini, S.
- Published
- 2007
- Full Text
- View/download PDF
5. Landslide Representation Strategies in Susceptibility Studies using Weights-of-Evidence Modeling Technique
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Poli, S. and Sterlacchini, S.
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- 2007
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6. Review of the current risk management strategies in Europe for hydro-meteorological hazards at protection and emergency level
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Cortes, V, primary, Frigerio, S, additional, Schenato, L, additional, Pasuto, A, additional, and Sterlacchini, S, additional
- Published
- 2012
- Full Text
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7. Spatial integration of thematic data for predictive landslide mapping: a case study from Oltrepo Pavese area, Italy
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Sterlacchini, S, primary, Masetti, M, additional, and Poli, S, additional
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- 2004
- Full Text
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8. Prendere sul serio la RRI. Riflessioni a partire dal progetto STRESS
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L'Astorina A., Bordogna G., and Sterlacchini S.
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rri ,citizen science ,vgi ,rischio idrogeologico - Abstract
Da molti anni la Commissione - nell'ambito delle azioni dedicate a rafforzare il legame tra scienza e società - invita i ricercatori a promuovere la cooperazione con soggetti esterni, dagli stakeholder ai cittadini, a comunicare di più e meglio, a valorizzare i risultati della propria ricerca dimostrando che essa può avere un impatto (sociale ed economico) sulla società. Ma ancora oggi queste attività sono considerate come non strettamente attinenti allo sviluppo della ricerca, se non proprio estranee, dalla maggior parte dei ricercatori, che spesso le delegano a figure esterne, ritenendosi poco adeguati (o non tenuti) a svolgerle. Con il risultato di acuire la separazione invece di rafforzare il legame tra scienza e società. 1 Questo atteggiamento, con il nuovo approccio della RRI, richiesto in tutti i progetti finanziati nell'ambito del programma Horizon2020 (H2020), non è più possibile, almeno in via teorica. Nella RRI si chiede infatti ai ricercatori di attuare un cambio del proprio modo di operare, "anticipando" i possibili impatti delle attività, "riflettendo" sulle azioni intraprese o da programmare durante le fasi, da quelle svolte quotidianamente fino alle interazioni personali con tutti gli attori dell'innovazione. Nella nuova configurazione del rapporto tra scienza e società auspicato da H2020 ci si aspetta dunque qualcosa di diverso e di più di una semplice adesione formale a delle norme o strumentale per accedere a un finanziamento comunitario. Per parafrasare il titolo di un report europeo (Felt 2007), la RRI chiede a tutti gli attori di "prendere sul serio" la responsabilità nella società della conoscenza, a cominciare dalla riflessione su come sta cambiando il proprio specifico ambito di ricerca e sulle implicazioni che il cambiamento e l'innovazione proposta possono avere per le responsabilità di tutti gli attori. E' quanto abbiamo provato a fare con il progetto "Strategies and Tools for REsilient Smart Societies" (dall'acronimo STRESS) che descriviamo brevemente in questo capitolo.
- Published
- 2018
9. Using Different Thresholds in Assessing Groundwater Vulnerability through Statistical Methods
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MASETTI, M., primary, SORICHETTA, A., additional, BALLABIO, C., additional, STERLACCHINI, S., additional, and POZZI, M., additional
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- 2011
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10. A Flexible Desktop Tool for the Deployment of Periodic Downstream Services
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Ceresi, A., primary, Antoninetti, M., additional, Sterlacchini, S., additional, Goffi, A., additional, Ranghetti, L., additional, Busetto, L., additional, Stroppiana, D., additional, Bordogna, G., additional, Boschetti, M., additional, Brivio, P. A., additional, and Pepe, M., additional
- Published
- 2018
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11. Evacuation study by crowd dynamics micro-simulation to support disaster prevention and management: The case of SIMULATOR project
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Manzoni, S, Sterlacchini, S, MANZONI, SARA LUCIA, Sterlacchini, S., Manzoni, S, Sterlacchini, S, MANZONI, SARA LUCIA, and Sterlacchini, S.
- Abstract
The paper presents an ongoing research within a multidisciplinary collaboration aiming at improving information and tools to prepare local authorities, volunteers and citizens (at a municipal and/or inter-municipal level) to anticipate, cope with, resist against and recover from the impacts of hydro-geological hazards. In particular, the paper aims at presenting the general framework and first results of the research activities we developed in order to demonstrate potential advantages from micro-simulation of evacuation dynamics. The research case study is settled on Italian Alps
- Published
- 2014
12. Land use and land cover (LULC) of the Republic of the Maldives: first national map and LULC change analysis using remote-sensing data
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Fallati, L, Savini, A, Sterlacchini, S, Galli, P, Galli, P., Fallati, L, Savini, A, Sterlacchini, S, Galli, P, and Galli, P.
- Abstract
The Maldives islands in recent decades have experienced dramatic land-use change. Uninhabited islands were turned into new resort islands; evergreen tropical forests were cut, to be replaced by fields and new built-up areas. All these changes happened without a proper monitoring and urban planning strategy from the Maldivian government due to the lack of national land-use and land-cover (LULC) data. This study aimed to realize the first land-use map of the entire Maldives archipelago and to detect land-use and land-cover change (LULCC) using high-resolution satellite images and socioeconomic data. Due to the peculiar geographic and environmental features of the archipelago, the land-use map was obtained by visual interpretation and manual digitization of land-use patches. The images used, dated 2011, were obtained from Digital Globe’s WorldView 1 and WorldView 2 satellites. Nine land-use classes and 18 subclasses were identified and mapped. During a field survey, ground control points were collected to test the geographic and thematic accuracy of the land-use map. The final product’s overall accuracy was 85%. Once the accuracy of the map had been checked, LULCC maps were created using images from the early 2000s derived from Google Earth historical imagery. Post-classification comparison of the classified maps showed that growth of built-up and agricultural areas resulted in decreases in forest land and shrubland. The LULCC maps also revealed an increase in land reclamation inside lagoons near inhabited islands, resulting in environmental impacts on fragile reef habitat. The LULC map of the Republic of the Maldives produced in this study can be used by government authorities to make sustainable land-use planning decisions and to provide better management of land use and land cover.
- Published
- 2017
13. Flood damage in Italy: towards an assessment model of reconstruction costs
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Sterlacchini, S., Zazzeri, M., Genovese, E., Modica, M., and Zoboli, Roberto
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Economic costs ,fungi ,parasitic diseases ,Settore SECS-P/02 - POLITICA ECONOMICA ,food and beverages ,Flood damage ,economic assessment ,recosntruction costs - Abstract
Recent decades in Italy have seen a very rapid expansion of urbanisation in terms of physical assets, while demographics have remained stable. Both the characteristics of Italian soil and anthropic development, along with repeated global climatic stress, have made the country vulnerable to floods, the intensity of which is increasingly alarming. The combination of these trends will contribute to large financial losses due to property damage in the absence of specific mitigation strategies. The present study focuses on the province of Sondrio in Northern Italy (area of about 3,200 km²), which is home to more than 180,000 inhabitants and the population is growing slightly. It is clearly a hot spot for flood exposure, as it is primarily a mountainous area where floods and flash floods hit frequently. The model we use for assessing potential flood damage determines risk scenarios by overlaying flood hazard maps and economic asset data. In Italy, hazard maps are provided by Regional Authorities through the Hydrogeological System Management Plan (PAI) based on EU Flood Directive guidelines. The PAI in the study area includes both the large plain and the secondary river system and considers three hazard scenarios of Low, Medium and High Frequency associated with return periods of 20, 200 and 500 years and related water levels. By an overlay of PAI maps and residential areas, visualized on a GIS, we determine which existing built-up areas are at risk for flood according to each scenario. Then we investigate the value of physical assets potentially affected by floods in terms of market values, using the database of the Italian Property Market Observatory (OMI), and in terms of reconstruction costs, by considering synthetic cost indexes of predominant building types (from census information) and PAI water height. This study illustrates a methodology to assess flood damage in urban settlements and aims to determine general guidelines that can be extended throughout Italy. The final objective will be to analyse how the loss prospective can change when mitigation measures, including actions to reduce the flood hazard and strategies to prevent potential consequences, are implemented. Flood impacts and the corresponding value of mitigation measures will be assessed by means of a cost-benefit analysis in accordance with the EU Floods Directive.
- Published
- 2016
14. Evaluation of Spatial Agreement of Distinct Landslide Prediction Models
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Sterlacchini, S, Sterlacchini, S, Frigerio, I, Bordogna, G, FRIGERIO, IVAN, Sterlacchini, S, Sterlacchini, S, Frigerio, I, Bordogna, G, and FRIGERIO, IVAN
- Abstract
The aim of the study was to assess the degree of spatial agreement of different predicted patterns in a majority of coherent landslide prediction maps with almost similar success and prediction rate curves. If two or more models have a similar performance, the choice of the best one is not a trivial operation and cannot be based on success and prediction rate curves only. In fact, it may happen that two or more prediction maps with similar accuracy and predictive power do not have the same degree of agreement in terms of spatial predicted patterns. The selected study area is the high Valtellina valley, in North of Italy, covering a surface of about 450 km2 where mapping of historical landslides is available. In order to assess landslide susceptibility, we applied the Weights of Evidence (WofE) modeling technique implemented by USGS by means of ARC-SDM tool. WofE efficiently investigate the spatial relationships among past events and multiple predisposing factors, providing useful information to identify the most probable location of future landslide occurrences. We have carried out 13 distinct experiments by changing the number of morphometric and geo-environmental explanatory variables in each experiment with the same training set and thus generating distinct models of landslide prediction, computing probability degrees of occurrence of landslides in each pixel. Expert knowledge and previous results from indirect statistically-based methods suggested slope, land use, and geology the best "driving controlling factors". The Success Rate Curve (SRC) was used to estimate how much the results of each model fit the occurrence of landslides used for the training of the models. The Prediction Rate Curve (PRC) was used to estimate how much the model predict the occurrence of landslides in the validation set. We found that the performances were very similar for different models. Also the dendrogram of the Cohen's kappa statistic and Principal Component Analysis (PCA) were de
- Published
- 2013
15. Aquifer nitrate vulnerability assessment using positive and negative Weights of Evidence methods, Milan, Italy
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Sorichetta, A, Masetti, M, Ballabio, C, Sterlacchini, S, Sterlacchini, S., BALLABIO, CRISTIANO, Sorichetta, A, Masetti, M, Ballabio, C, Sterlacchini, S, Sterlacchini, S., and BALLABIO, CRISTIANO
- Abstract
Statistical methods are extensively used by hydrogeologists for assessing groundwater vulnerability. Several of these methods require to express the response variable as binary and to select a threshold distinguishing between positive and negative indicators of contamination that are usually identified as occurrences and non-occurrences, respectively. In this study, both occurrences and non-occurrences were alternately used as training points (TPs) in the Weights of Evidence (WofE) for assessing groundwater vulnerability to nitrate contamination of a shallow, unconfined, porous aquifer. This was done to better understand the individual role and the combined effect of explanatory variables in both protecting and exposing groundwater from and to nitrate contamination in the study area. The idea behind this approach is that, for a given aquifer, each explanatory variable should have an unequivocal effect on the physical process of groundwater contamination. As part of this study, a procedure for multi-class generalization was developed. Results showed that an evidential theme, even if it appears to be a statistically significant predictor of occurrences, can show an equivocal spatial relationship with the positive and the negative indicators of contamination due to the presence of a sampling bias between the TPs and the evidential theme. It was demonstrated that, if sampling bias is not recognized and corrected, the use of such evidential theme in the analysis could lead to obtain unreliable groundwater vulnerability maps. In order to deal with this issue, a quantitative methodology to correct the effects of sampling bias was successfully tested. Indeed, once the spatial relationships between the different type of TPs and the considered evidential themes were corrected for the effects of sampling bias, the WofE method was found to be a reliable modeling technique for assessing groundwater vulnerability and proved to be capable of identifying areas characterized by diff
- Published
- 2012
16. Support Vector Machines for Landslide Susceptibility Mapping: the Staffora River Basin Case Study, Italy
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Ballabio, C, Sterlacchini, S, BALLABIO, CRISTIANO, Sterlacchini, S., Ballabio, C, Sterlacchini, S, BALLABIO, CRISTIANO, and Sterlacchini, S.
- Abstract
The aim of this study is the application of support vector machines (SVM) to landslide susceptibility mapping. SVM are a set of machine learning methods in which model capacity matches data complexity. The research is based on a conceptual framework targeted to apply and test all the procedural steps for landslide susceptibility modeling from model selection, to investigation of predictive variables, from empirical cross-validation of results, to analysis of predicted patterns. SVM were successfully applied and the final susceptibility map was interpreted via success and prediction rate curves and receiver operating characteristic (ROC) curves, to support the modeling results and assess the robustness of the model. SVM appeared to be very specific learners, able to discriminate between the informative input and random noise. About 78% of occurrences was identified within the 20% of the most susceptible study area for the cross-validation set. Then the final susceptibility map was compared with other maps, addressed by different statistical approaches, commonly used in susceptibility mapping, such as logistic regression, linear discriminant analysis, and naive Bayes classifier. The SVM procedure was found feasible and able to outperform other techniques in terms of accuracy and generalization capacity. The over-performance of SVM against the other techniques was around 18% for the cross-validation set, considering the 20% of the most susceptible area. Moreover, by analyzing receiver operating characteristic (ROC) curves, SVM appeared to be less prone to false positives than the other models. The study was applied in the Staffora river basin (Lombardy, Northern Italy), an area of about 275 km 2 characterized by a very high density of landslides, mainly superficial slope failures triggered by intense rainfall events.
- Published
- 2012
17. First level inspection by trained-volunteers of torrent control structures in mountainous catchments: towards a quality-evaluation of data collected
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Cortes, J., Mkm, Charriere, Zc, Aye, Bossi, G., Viero, A., Frigerio, S., Schenato, L., Sterlacchini, S., Thom Bogaard, Pasuto, A., Cortes V., Charrière M., Aye Z.-C., Bossi G., Viero A., Frigerio S., Schenato L., Sterlacchini S., Bogaard T., and Pasuto A.
- Abstract
Modern approaches for emergency management promote exchange of information between local authorities and community aiming at more appropriate and effective ways to manage hydro-meteorological risks1. In this framework, risk communication should not only start during the build-up of the hazard, but also in pre-warning and 'peace' time and it contribute to better emergency preparedness. Lately, a rapid growth of interest emerges to enable citizens to inspect hazard-related processes on their territory2. From the risk managers perspective, substantial advantages of taking this citizen-based approach include (1) the opportunity to identify on a quick and 'relatively' low cost basis one or more risk components at different geographical locations and (2) the ability to provide a practical application for citizens interested in creating and communicating useful information toward establishing a better understanding of their territory. From the citizens perspectives, it provides the opportunity to generate benefit through increasing and encouraging interest for self-awareness as well as self-preparedness. However, the use of citizen-based information also bring forth the need to train and establish standardized forms, guidelines and tools, particularly if the data collected seek to be useful information for decision-making activities and emergency management3. In this research work, we address the question on the quality of data collected by volunteers for decision-making activities. This in the framework of the civil protection organization of the Friuli-Venezia-Giulia (CP-FVG) and the Italian study area of the CHANGES project, Municipality of Pontebba4. An experiment is carried out by analyzing the results of a questionnaire form dealing with the inspection of the functional status of check dams and bridges across streams. This form is filled by volunteers (in this case, citizens and university students), that register to a web-portal with access by browser after a standardized training given by practitioners and scientists. During the latter, the guidelines to fill the questionnaire, i.e. various conditions of hydraulic structures and the proposed criteria for quality evaluation5, will be disseminated to the volunteers. The quality of the data are analyzed on the basis of these guidelines in order to determine if the citizens-based data collection approach can be used to prioritize the structures to be inspected by the risk managers.
- Published
- 2013
18. Quantitative assessment of changes in landslide risk using a regional scale run-out model : abstract
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Haydar Hussin, Xuelong Chen, Ciurean, R., Cees Van Westen, Reichenbach, P., Sterlacchini, S., Department of Earth Systems Analysis, Department of Water Resources, Faculty of Geo-Information Science and Earth Observation, UT-I-ITC-WCC, and UT-I-ITC-4DEarth
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METIS-311480 - Published
- 2015
19. Susceptibility analysis
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Crepaz, A, Defendi, V, Frigerio, S, Gabrieli, J, Galuppo, A, Magnabosco, L, Mantovani, M, Pasuto, A, Frigerio, I, Sterlacchini, S, FRIGERIO, IVAN, Sterlacchini, S., Crepaz, A, Defendi, V, Frigerio, S, Gabrieli, J, Galuppo, A, Magnabosco, L, Mantovani, M, Pasuto, A, Frigerio, I, Sterlacchini, S, FRIGERIO, IVAN, and Sterlacchini, S.
- Abstract
La tecnica WofE, utilizzata anche nel Progetto Permanet, prevede l’acquisizione di una serie di informazioni spazializzate e standardizzate. Il modello si basa su metodologia quantitativa per combinare “evidenza“ a supporto dell’ipotesi (ossia la distribuzione dell’evento) e si fonda su una serie di temi (es. uso del suolo, litologia) a cui viene dato un peso rispetto alla probabilità di accadimento. I parametri su cui si basa il modello consistono in una serie di dati d’ingresso e un set di fenomeni avvenuti presenti in un database storico (training points). I parametri gestiti sono vincolati alla loro disponibilità e ricampionati per ottenere una risoluzione standard, The WofE technique, also used by the PermaNET Project, is based on the acquisition of spatial and standardised information. This model is aimed at collecting evidence supporting the hypothesis (the event distribution) through a quantitative method and is based on a number of elements (such as land use, lithology) that acquire a certain weight in relation to their likeliness of occurrence. The model parameters are a series of input data and of occurred events inserted into a historical database (training points). The use of these pa- rameters depends on their availability; they are then re-sampled in order to obtain a standard resolution.
- Published
- 2011
20. High-resolution weather forecast for an alerting system in the Alps area
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Salerno, R, Perotto, A, DE BIASE, L, Brusasca, G, DI GUARDO, A, Sterlacchini, S, DI GUARDO, ANDREA, Sterlacchini, S., DE BIASE, LUCIA, Salerno, R, Perotto, A, DE BIASE, L, Brusasca, G, DI GUARDO, A, Sterlacchini, S, DI GUARDO, ANDREA, Sterlacchini, S., and DE BIASE, LUCIA
- Abstract
Per predisporre efficaci sistemi di allerta al verificarsi,in zone montane, di eventi meteorologici estremi, è indispensabile conoscere: previsioni meteorologiche estremamente accurate e le caratteristiche idrogeologiche e geomorfologiche della zona. A partire da queste informazioni è possibile addestrare un insieme di reti neurali che permettano di convertire le previsioni meteorologiche in probabilità di accadimento di frane e/o alluvioni e, qualora se ne verifichi la necessità, predisporre le procedure di protezione civile in modo automatico e con anticipo sufficiente a salvare persone, luoghi e attività.
- Published
- 2010
21. Dss and gis tool for civil protection planning in case of flooding hazard
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DE AMICIS, M, Frigerio, I, Frigerio, S, Poretti, I, Sironi, S, Sterlacchini, S, DE AMICIS, MATTIA GIOVANNI MARIA, FRIGERIO, IVAN, PORETTI, ILARIA, SIRONI, SIMONE, Sterlacchini, S., DE AMICIS, M, Frigerio, I, Frigerio, S, Poretti, I, Sironi, S, Sterlacchini, S, DE AMICIS, MATTIA GIOVANNI MARIA, FRIGERIO, IVAN, PORETTI, ILARIA, SIRONI, SIMONE, and Sterlacchini, S.
- Abstract
The Civil Protection purpose is to better protect people, their environment, property and cultural heritage in case of major natural events or manmade disasters (Foster, 1980, Alexander, 1998, Alexander, 2000). The management of a critical event has precise goals: people safeguard, taking care of the injured, coordination of first aid activities, recovery of primary public services, management of personnel, organization of resources and communication with public and private institutions, government agencies, authorities and citizens (Cate, 1994; Daines, 1991; Drabek et al., 1991). In a broader view, the role of Civil Protection is carried out through three key modes of action: prevention, preparedness and response. These actions encompass: a) the prevention of risks and damage to people, properties, infrastructure and in so doing environment, in the event of disasters, detecting and studying causes of disasters, improving means and methods of forecasting, analysing the characteristics of the damaging event together with the vulnerability of the territory, respectively; b) the increase of the degree of preparedness of people involved in Civil Protection, in order to raise their ability to quickly and effectively respond to an emergency; the cooperation requires a rapid mobilisation of intervention teams, experts and other resources in the event of major emergencies in order to alleviate the effects of a disaster during the first days. The Civil Protection is entrusted to facilitate these actions as well to offer technical or technological support, if required; c) the improvement of the techniques and methods of response and taking care emergencies; d) the enhance of the public information, education and awareness, helping citizens to protect themselves more effectively. Information is the key to successful cooperation in Civil Protection matters. The dissemination of information can be carried out in advance or during the emergency; e) the granting of financial assis
- Published
- 2009
22. Analisi del rischio e gestione dell’emergenza idrogeologica mediante GIS e sistemi di supporto alle decisioni
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Frigerio, I, Faccin, F, La Valle, M, Sterlacchini, S, FRIGERIO, IVAN, Sterlacchini, S., Frigerio, I, Faccin, F, La Valle, M, Sterlacchini, S, FRIGERIO, IVAN, and Sterlacchini, S.
- Abstract
The objective of this work was to draw up a Municipality Emergency Plan, implemented in a information support, in order to manage a Hydro- geological Emergency. The landslide occurrence probability needs the drafting of a Civil Protection Plan able to reliably tackle the management of emergencies. The study of the hazard area together with its vulnerability, enables to analyze and to make a zonation of the risk within the same area. This information is necessary to develop the Emergency Procedures to be applied on the occasion of a Landslide event. The use of Geographic Information Systems makes more efficient the contemporary management both of the cartography of the area and of useful databases concerning for example Civil Protection resources and structures required to overtake the emergence. This approach leads up to computerize and speed up the reply of the structures involved in an emergency situation, leading to a significant reduction of the response time by the staff that manage the emergency operations, and leading to an increase of the qualitative efficiency response.
- Published
- 2009
23. Decision support method to systematically evaluate first-level inspections of the functional status of check dams
- Author
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Cortes Arevalo, V.J. (author), Sterlacchini, S (author), Bogaard, T.A. (author), Junier, S.J. (author), van de Giesen, N.C. (author), Cortes Arevalo, V.J. (author), Sterlacchini, S (author), Bogaard, T.A. (author), Junier, S.J. (author), and van de Giesen, N.C. (author)
- Abstract
First-level inspections could be provided by skilled volunteers or technicians to pre-screen the functional status of check dams. This paper discusses the design and testing of a support method in collaboration with the responsible technicians in evaluating inspection reports. Reports are based on linguistic rating scales that are systematically aggregated into indices by means of a multi-criteria TOPSIS method with fuzzy terms. The aggregation procedure is carried out for three parameters representing the structure’s status while highlighting any lack of completeness of inspection reports. The method was evaluated using inspection reports collected during a workshop in the Fella basin in the Italian Alps. The method allows the responsible technicians to set rules to categorise the aggregated indices in one of three levels, each corresponding with a course of action. Rules were useful to categorise the aggregated indices according to the structure’s status. Disagreements on rating defects suggest that a weighted aggregation procedure to calculate the indices might lead to overestimating or underestimating defects. Complementary data from historical inspections or remote sensing are required to initiate specific actions. The method can be applied to pre-screen different types of hydraulic structures after adaptation to the local conditions and functional requirements., harvest, Water Resources
- Published
- 2016
- Full Text
- View/download PDF
24. Susceptibility analysis
- Author
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FRIGERIO, IVAN, Sterlacchini, S., Crepaz, A, Defendi, V, Frigerio, S, Gabrieli, J, Galuppo, A, Magnabosco, L, Mantovani, M, Pasuto, A, Frigerio, I, and Sterlacchini, S
- Subjects
permafrost, susceptibility analysis, debris flow, landslide, weights of evidence ,GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA - Abstract
La tecnica WofE, utilizzata anche nel Progetto Permanet, prevede l’acquisizione di una serie di informazioni spazializzate e standardizzate. Il modello si basa su metodologia quantitativa per combinare “evidenza“ a supporto dell’ipotesi (ossia la distribuzione dell’evento) e si fonda su una serie di temi (es. uso del suolo, litologia) a cui viene dato un peso rispetto alla probabilità di accadimento. I parametri su cui si basa il modello consistono in una serie di dati d’ingresso e un set di fenomeni avvenuti presenti in un database storico (training points). I parametri gestiti sono vincolati alla loro disponibilità e ricampionati per ottenere una risoluzione standard The WofE technique, also used by the PermaNET Project, is based on the acquisition of spatial and standardised information. This model is aimed at collecting evidence supporting the hypothesis (the event distribution) through a quantitative method and is based on a number of elements (such as land use, lithology) that acquire a certain weight in relation to their likeliness of occurrence. The model parameters are a series of input data and of occurred events inserted into a historical database (training points). The use of these pa- rameters depends on their availability; they are then re-sampled in order to obtain a standard resolution.
- Published
- 2011
25. Un sistema di supporto alle decisioni per la pianificazione e gestione delle emergenze a livello locale
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FRIGERIO, IVAN, DE AMICIS, MATTIA GIOVANNI MARIA, Trozzi, A, Sterlacchini, S, Busini, V, Sironi, S., Frigerio, I, Trozzi, A, Sterlacchini, S, DE AMICIS, M, Busini, V, and Sironi, S
- Subjects
GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA ,gestione delle emergenze, suscettibilità, pericolosità, rischio - Published
- 2011
26. PermaNET in Veneto Region
- Author
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Galuppo, A, Magnabosco, L, Defendi, V, Crepaz, A, Cagnati, A, Pasuto, A, Frigerio, S, Mantovani, M, Sterlacchini, S, Gabrieli, J, Barbante, C., FRIGERIO, IVAN, Galuppo, A, Magnabosco, L, Defendi, V, Crepaz, A, Cagnati, A, Pasuto, A, Frigerio, S, Mantovani, M, Frigerio, I, Sterlacchini, S, Gabrieli, J, and Barbante, C
- Subjects
GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA ,debris flow, susceptibility analysis, permafrost - Published
- 2011
27. Experiences on the development of a Community Based Early Warning System for mountain risks in Northern Italy
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FRIGERIO, IVAN, DE AMICIS, MATTIA GIOVANNI MARIA, Sterlacchini, S, Garcia, C, Fontana, M, Trozzi, A., Frigerio, I, DE AMICIS, M, Sterlacchini, S, Garcia, C, Fontana, M, and Trozzi, A
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Early Warning System, risk management, prevision, prevention ,GEO/05 - GEOLOGIA APPLICATA - Abstract
In the framework of the European project Mountain Risks (http://mountain-risks.eu/), one of the projects currently developed is a methodology to integrate risk management and evacuation emergency plans, focused on prevention as a key element for disaster risk reduction, applied in the Mountain Community Valtellina of Tirano, an area recurrently affected by several mountain hazards. Taking into account the actual state of disaster risk reduction initiatives in the study area, including the existence of a real time emergency plan based on GIS (Geographical Information Systems), DSS (Decision Support Systems), and ICT (Information & Communication Technology), but knowing the lack involvement of the general community in any of the preparation activities developed until the present and the lack of divulgation of the current emergency plan, it was decided that the methodology that could better adapt to the actual conditions of the study area would be a non structural Community Based Early Warning System (CBEWS). A CBEWS has been recognized by institutions as the UN and the INSDR, as an effective and important strategy for disaster risk reduction. This strategy is broadly used especially in developing countries and has proved its effectiveness in many disasters crisis all over the world. In spite of that, possibly for political and social reasons, there are really few applications of CBEWS in developed countries which has made the elaboration of this research project a particularly difficult process due to the lack of previous references with similar conditions to the one in the study area. Difficulties related to any multidisciplinary work which also involves the general community have been faced during the development of the project such as the differences in language (both the technical jargon of the different disciplines and the native language), time restrictions, the process of learning and adapting to different social structures, the process of contacting several institutions and persons looking to co-involve them in the project. The development of the CBEWS involves several phases: hazard and risk assessment including the analysis of the legal framework and the application of an extensive social survey to evaluate the levels of risk perception, awareness, preparation and information desires of the community; the development of prevention and monitoring strategies and preparedness activities, including the development of a communication campaign developed by an interdisciplinary group to inform and educate the community and practitioner stakeholders. Preliminary results of the survey show, among others, low levels of risk perception and preparedness, and lack of knowledge and information related to natural hazards. All the results confirm the necessity of develop the communication and education campaign. The aim of the CBEWS is not only to increase the level of preparedness of the community and decrease its vulnerability, but also to strengthen institutional collaboration, in particular local institutions, in order to assure acontinuity of the efforts
- Published
- 2010
28. La valutazione del rischio di frana
- Author
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Giacomelli, P, Sterlacchini, S, De Amicis, MGM, Giacomelli, P, Sterlacchini, S, and De Amicis, M
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lcsh:Industries. Land use. Labor ,incertezza ,funzione di utilità attesa ,causa-effetto ,danni diretti ed indiretti ,lcsh:HD28-9999 ,incertezza, funzionedi utilità attesa, causa-effetto, dannidiretti ed indiretti - Abstract
In the Environmental risk evaluation, the most important problem are: to attempt to anticipate the risks, to assess the relationships between causes and effects and to balance the benefits with the costs associated to the control of risks. Risk assessment is mixed with risk management, which is in effect a different area of human behavior. According to mainstream economics refer risk to individual behavior, the Expected utility function (EUF) incorporates risk: risk aversion is strictly individual, it’s necessary a good knowledge of probability occurrence and risk is managed through decision. But, when we use multidimensional data to describe the risk, EUF seems inadequate: environmental risks are complex, and so individual can not manage them. The main consequence is that environmental risk is to be considered exogenous with respect to individual behavior. Environmental economics assesses risks on the basis of the relationship: causes lead to effects. Effects have to be evaluated as physical/technical ones, afterwards it is possible to assess their economic value., Aestimum, Aestimum 42 (2003)
- Published
- 2009
- Full Text
- View/download PDF
29. Analisi del rischio e gestione dell’emergenza idrogeologica mediante GIS e sistemi di supporto alle decisioni
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FRIGERIO, IVAN, Faccin, F, La Valle, M, Sterlacchini, S., Frigerio, I, Faccin, F, La Valle, M, and Sterlacchini, S
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GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA ,risk analysis, hazard, landslide, vulnerability - Abstract
The objective of this work was to draw up a Municipality Emergency Plan, implemented in a information support, in order to manage a Hydro- geological Emergency. The landslide occurrence probability needs the drafting of a Civil Protection Plan able to reliably tackle the management of emergencies. The study of the hazard area together with its vulnerability, enables to analyze and to make a zonation of the risk within the same area. This information is necessary to develop the Emergency Procedures to be applied on the occasion of a Landslide event. The use of Geographic Information Systems makes more efficient the contemporary management both of the cartography of the area and of useful databases concerning for example Civil Protection resources and structures required to overtake the emergence. This approach leads up to computerize and speed up the reply of the structures involved in an emergency situation, leading to a significant reduction of the response time by the staff that manage the emergency operations, and leading to an increase of the qualitative efficiency response.
- Published
- 2009
30. Dss and gis tool for civil protection planning in case of flooding hazard
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DE AMICIS, MATTIA GIOVANNI MARIA, FRIGERIO, IVAN, PORETTI, ILARIA, SIRONI, SIMONE, Frigerio, S, Sterlacchini, S., DE AMICIS, M, Frigerio, I, Frigerio, S, Poretti, I, Sironi, S, and Sterlacchini, S
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Civil Protection, Emergency Management, Hazard and Risk Potential Scenario, GIS, Work Flow Management ,GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA - Abstract
The Civil Protection purpose is to better protect people, their environment, property and cultural heritage in case of major natural events or manmade disasters (Foster, 1980, Alexander, 1998, Alexander, 2000). The management of a critical event has precise goals: people safeguard, taking care of the injured, coordination of first aid activities, recovery of primary public services, management of personnel, organization of resources and communication with public and private institutions, government agencies, authorities and citizens (Cate, 1994; Daines, 1991; Drabek et al., 1991). In a broader view, the role of Civil Protection is carried out through three key modes of action: prevention, preparedness and response. These actions encompass: a) the prevention of risks and damage to people, properties, infrastructure and in so doing environment, in the event of disasters, detecting and studying causes of disasters, improving means and methods of forecasting, analysing the characteristics of the damaging event together with the vulnerability of the territory, respectively; b) the increase of the degree of preparedness of people involved in Civil Protection, in order to raise their ability to quickly and effectively respond to an emergency; the cooperation requires a rapid mobilisation of intervention teams, experts and other resources in the event of major emergencies in order to alleviate the effects of a disaster during the first days. The Civil Protection is entrusted to facilitate these actions as well to offer technical or technological support, if required; c) the improvement of the techniques and methods of response and taking care emergencies; d) the enhance of the public information, education and awareness, helping citizens to protect themselves more effectively. Information is the key to successful cooperation in Civil Protection matters. The dissemination of information can be carried out in advance or during the emergency; e) the granting of financial assistance to the affected areas via the Solidarity Fund.
- Published
- 2009
31. Utilizzo delle tecniche GIS e di Sistemi di Supporto alle Decisioni(DSS) nell’analisi dei rischi idrogeologici nella gestione delle emergenze in tempo reale
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Savi, S, Sterlacchini, S, Sironi, S., DE AMICIS, MATTIA GIOVANNI MARIA, FRIGERIO, SIMONE, Savi, S, DE AMICIS, M, Frigerio, S, Sterlacchini, S, and Sironi, S
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gis, protezione civile, dss, rischio idrogeologico ,GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA - Abstract
The main aim of this work is developing new technologies for managing emergencies in the field of Civil Protection. In Italy and in Lombardy there are many lows that govern the management of emergencies and give directives to guide the implementation of municipal emergency plans for the Civil Defence. The innovative aspect of this research is to combine the potential of Geographic Information Systems (GIS), of Decisions Support Systems (DSS) and of the most modern mobile technologies (for communication) for the emergency management in a real-time. For this work is used a software called PETer (developed by Globo Srl), a geographic information system that is able to integrate different kind of information. This software allows us to manage all the information that are necessary to the implementation of an emergency plan and is able to give guidelines for overcoming it. In this way all the involved people are able to know what they have to do in all the phases of the emergency. The potential of the software is being consultable, easy usable and upgradeable.
- Published
- 2009
32. Analysing changes in landslide risk using multi temporal landslide susceptibility and run-out modeling on a regional scale : extended abstract
- Author
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Hussin, H.Y., Chen, L., Ciurean, R., van Westen, C.J., Reichenbach, P., Sterlacchini, S., Department of Earth Systems Analysis, Faculty of Geo-Information Science and Earth Observation, and UT-I-ITC-4DEarth
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Run-out modeling ,Landslide risk assessment ,Landslide susceptibility ,Debris flows - Published
- 2014
33. Design and implementation of a data model and data input module for a multi hazard risk assessment spatial support decision system : extended abstract
- Author
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Andrejchenko, V., Bakker, W.H., van Westen, C.J., Sterlacchini, S., Department of Earth Systems Analysis, Faculty of Geo-Information Science and Earth Observation, and UT-I-ITC-4DEarth
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Database ,Spatial data modelling ,Database management ,Data input - Published
- 2014
34. Techniques for the modelling of the process systems in slow and fast-moving landslides
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Ferrari, A., Quan Luna, B., Spickermann, A., Travelletti, J., Krzeminska, D.M., Eicheberger, J., van Asch, Th.W.J., van Beek, L.P.H., Bogaard, T.A., Malet, J.P., Laloui, L., Van Asch, T., Corominas, J., Greiving, S., Malet, J-P., Sterlacchini, S, Landscape functioning, Geocomputation and Hydrology, Landdegradatie en aardobservatie, and Hydrologie
- Published
- 2014
35. CARE-G Una piattaforma di servizi per la cura della salute e la qualità della vita del cittadino anziano: analisi dei requisiti del sistema organizzativo informativo: definizione delle informazioni da monitorare e delle procedure di care-giving
- Author
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Bordogna G., Mangioni E., Daminelli R., Sterlacchini S., Lella S., and Rampini A.
- Published
- 2014
36. A landslide susceptibility analysis for Buzau County, Romania
- Author
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Zumpano V., Hussin H., Reichenbach P, Baltenau D., Micu M., and Sterlacchini S.
- Subjects
Landslide ,Romania ,susceptibility analysis ,weights-of-evidence - Abstract
Landslides are one of the most common hazards in the Romanian Curvature Carpathians and Subcarpathians, covering a wide range of geomorphic mass wasting forms and processes. The purpose of this paper is to present a susceptibility analysis at regional scale for the Buzau County (Romania), focusing on shallow and medium-seated (sensu B?lteanu 1983) landslides. The susceptibility map was obtained using the weights-ofevidence modeling technique that allows understanding the significance of predisposing factors of shallow and medium-seated failures. The model was run considering eight environmental factors: slope, altitude, internal relief, planar and profile curvature, aspect, soil, land-use. A landslide inventory derived from archive data, literature review, field mapping and aerial imagery interpretation was divided into a training and a prediction set and was used to prepare and validate the model. The model performance was evaluated using the area under the ROC and the success rate curve. The susceptibility map represents an important step for landslide hazard and risk assessment, crucial components for the definition of adequate risk management strategies.
- Published
- 2014
37. Supporting a Regional Agricultural Sector with Geo & Mainstream ICT – the Case Study of Space4Agri Project
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Kliment, T., Bordogna, G., Frigerio, L., Stroppiana, D., Crema, A., Boschetti, M., Sterlacchini, S., and Brivio, P. A.
- Subjects
Agricultural and Food Policy ,Geo & Mainstream ICT ,Lombardy ,Space4Agri ,Agriculture - Abstract
Agriculture is a global issue nowadays. At the European level, it is a sector, in which we are investing many resources. In particular, the Agri-Food sector plays a central role in the policies of the European Commission and the Horizon 2020 research and innovation program, as well as being the main theme of Expo 2015 that will be held in Milan, Lombardy. In the Lombardy region, the farmers represent 2% of the entire population, cultivating about 80% of the agricultural land. Increasing needs to develop a common body of knowledge shared at the regional and national level so as to make it possible to effectively monitor cropping systems, water stress and impacts of climate changes affecting more frequently the territory, are becoming more and more urgent. In this context, the project Space4Agri (S4A) intends to support the regional and local needs in terms of management of the agriculture sector, by designing and developing an information and knowledge based platform for managing geospatial and mainstream information by making it accessible over the Internet by standard communication technologies (Geo&Mainstream ICT). This platform has been designed to allow data workflows integrating i) spatial data and observations, ii) non-spatial information available from existing agronomic databases, iii) data collected in the field by farmers, agronomists and volunteers using mobile applications, iv) data collected by unmanned aerial sensors, and/or data produced by researchers as a result of applying scientific analysis on high quality remote sensing data. Foreseen results of the Space4Agri project and from other similar ongoing research activities may significantly spur the socio-economic development of Europe and create new growth opportunities for companies, public administrations, students and citizens.
- Published
- 2014
- Full Text
- View/download PDF
38. Supporting a Regional Agricultural Sector with Geo & Mainstream ICT â€' the Case Study of Space4Agri Project
- Author
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Kliment, T., Bordogna, G., Frigerio, L., Stroppiana, D., Crema, A., Boschetti, M., Sterlacchini, S., and Brivio, P. A.
- Subjects
Agriculture, Geo & Mainstream ICT, Space4Agri, Lombardy, Agricultural and Food Policy, GA, IN - Abstract
Agriculture is a global issue nowadays. At the European level, it is a sector, in which we are investing many resources. In particular, the Agri-Food sector plays a central role in the policies of the European Commission and the Horizon 2020 research and innovation program, as well as being the main theme of Expo 2015 that will be held in Milan, Lombardy. In the Lombardy region, the farmers represent 2% of the entire population, cultivating about 80% of the agricultural land. Increasing needs to develop a common body of knowledge shared at the regional and national level so as to make it possible to effectively monitor cropping systems, water stress and impacts of climate changes affecting more frequently the territory, are becoming more and more urgent. In this context, the project Space4Agri (S4A) intends to support the regional and local needs in terms of management of the agriculture sector, by designing and developing an information and knowledge based platform for managing geospatial and mainstream information by making it accessible over the Internet by standard communication technologies (Geo&Mainstream ICT). This platform has been designed to allow data workflows integrating i) spatial data and observations, ii) non-spatial information available from existing agronomic databases, iii) data collected in the field by farmers, agronomists and volunteers using mobile applications, iv) data collected by unmanned aerial sensors, and/or data produced by researchers as a result of applying scientific analysis on high quality remote sensing data. Foreseen results of the Space4Agri project and from other similar ongoing research activities may significantly spur the socio-economic development of Europe and create new growth opportunities for companies, public administrations, students and citizens.
- Published
- 2014
39. The effect of landslide representation and sample size on susceptibility assessments applied to different landslide types and case study areas
- Author
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Hussin. H., Zumpano, V., Reichenbach, P., Sterlacchini, S., Micu, M., Van Westen, C.j., and Balteanu, D.
- Subjects
landslide susceptibility assessment ,landslide sampling ,Landslide representation - Abstract
Statistical based landslide susceptibility models are widely used in medium to regional scale assessments. The two main inputs in these models are the landslide inventory of past events and the landslide caustative factor maps. In this study we assessed how the performance and prediction capability of the Weights-of-Evidence (WofE) susceptibility model is affected by the way we represent landslides in the pixel format, considering the entire polygon or only the landslide centroid. Influence of pixel density representing the landslide polygon was also taken into account. The second part of the research concidered the effect of the landslide model training and prediction sample sizes on the performance and prediction rates of the WofE model. Two case study areas were chosen to apply the representation and sampling tests: (1) the Fella River Basin (Eastern Italian Alps) containing debris flows and (2) the four times larger Buzau County (Romanian Carpathians) containing shallow landslides. Both areas are very different in terms of size, landslide types and geo-environmental factors, and were chosen in order to determine the applicability and flexibility of our analysis. Our results indicate that there is only a minor increase in performance and prediction when increasing the number of pixels to represent the entire landslide polygon. As the number of pixels increased from a single centroid to all pixels within the polygon, we found that the relative increase in pixels was similar within all classes (e.g. grass-land, forest, bare rock) of each thematic factor map like land-use or litholo gy. This indicated that the landslides have a similar size across the entire study area and is one of the causes of the lack of significant increase in model performance. The similari ty in performance and prediction rates for different landslide representation tests was in contrast to their respective susceptibility maps, which did show significant differences among each-other. This requires further analysis in future studies to determine which susceptibility map should be chosen for decision making. As for the sample size analysis, we have found that using 10 to 20% of all landslides to train the WofE model in both case studies is sufficient to predict the remaining 80 to 90% of the landslides. Modeling with more than 20% of the landslides causes a "plateau effect" in the performance and prediction rates. This indicate s that only a small percentage of all the landslides in an inventory are needed for good prediction results, making it also unnecessary to map every landslide in the area for a suffici ent performing landslide susceptibility analysis.
- Published
- 2014
40. GIS and 3D geological reconstruction in the Southern Alps: the Zuccone gravitational deformation, Val Taleggio (BG), Italy
- Author
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Zanchi, A, Salvi, F, Natoli, M, DE AMICIS, M, Jadoul, F, Sterlacchini, S, ZANCHI, ANDREA MARCO, DE AMICIS, MATTIA GIOVANNI MARIA, Sterlacchini, S., Zanchi, A, Salvi, F, Natoli, M, DE AMICIS, M, Jadoul, F, Sterlacchini, S, ZANCHI, ANDREA MARCO, DE AMICIS, MATTIA GIOVANNI MARIA, and Sterlacchini, S.
- Published
- 2004
41. GIS and 3D geological reconstruction of the Zuccone gravitational deformation, Val Taleggio (Southern Alps)
- Author
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Venturini, C, Pasquarè, G, Zanchi, A, Salvi, F, Natoli, E, DE AMICIS, M, Jadoul, F, Sterlacchini, S, ZANCHI, ANDREA MARCO, DE AMICIS, MATTIA GIOVANNI MARIA, Sterlacchini, S., Venturini, C, Pasquarè, G, Zanchi, A, Salvi, F, Natoli, E, DE AMICIS, M, Jadoul, F, Sterlacchini, S, ZANCHI, ANDREA MARCO, DE AMICIS, MATTIA GIOVANNI MARIA, and Sterlacchini, S.
- Abstract
This work aims to show how geological maps can be used for the 3D modelling of complex geological bodies. Geological data must be organised in a Geographic Information System and then imported in GOCAD, a software which allows the creation of 3D surfaces, solids and grids using points and linear elements. A deep-seated slope gravitational deformation developed in the Triassic sedimentary cover of the Southern Alps (Val Taleggio, BG) has been reconstructed. This phenomenon occurs in a complex structural setting comprising thrust faults crossed by strike-slip and normal faults. 3D modelling is mainly based on topographic, geological, structural, and morphological linear features. In this way a direct control of bi-dimensional interpretations is possible, leading to a better understanding of complex geological bodies, and as a base for geomechanical modelling.
- Published
- 2004
42. Ricostruzioni geologiche tridimensionali: metodologie ed esempi di applicazioni
- Author
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Sterlacchini, S, Salvi, F, SIRONI, SIMONE, ZANCHI, ANDREA MARCO, Sterlacchini, S, Salvi, F, Sironi, S, and Zanchi, A
- Subjects
GEO/03 - GEOLOGIA STRUTTURALE ,ricostruzioni 3d, gocad, geologia strutturale, GIS - Published
- 2008
43. Landslide susceptibility and associated confidence by spatial analysis: Two applications in northern Italy's mountain areas
- Author
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FABBRI, ANDREA, CAVALLIN, ANGELO, Poli, S, Sterlacchini, S, Chung, CJ, Fabbri, A, Poli, S, Sterlacchini, S, Cavallin, A, and Chung, C
- Subjects
GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA ,landslide susceptibility, spatial analysis - Abstract
This contribution discusses how spatial prediction models of landslide susceptibility can be applied to datasets with combination of categorical and continuous data layers maintaining the variability of values: i.e., avoiding binary transformations that impoverish their significance. The data layers represent conditional factors, such as geology, land use, distance from thrusts, internal relief, slope, attitude and permeability, which are used to associate the distribution of mapping units with that of landslides, possibly of specific dynamic types and time intervals of occurrence. The landslide trigger areas, used as training sites, maintain in the modeling their spatial extension as polygonal patches. Predictions are made by mathematical models, e.g., empirical likelihood ratio, also using several occurrence subsets to obtain blind testing for empirical cross-validation of the spatial prediction results. Prediction maps are interpreted in relation with the corresponding prediction-rate curves expressing the goodness of the prediction. Datasets from two study areas in northern Italy, come from the Apennines and from the Alps. Different analytical strategies are followed in the two study areas due to the difference in density of landslide occurrence. The prediction-rate curves obtained provide continuous class values distributions that preserve variability thus avoiding prediction class grouping before interpretation. The analysis of the prediction-rate curves, tables and histograms leads to more articulate criteria for decisions aiming at hazard mitigation or avoidance. Maps of predicted susceptibility/hazard levels are generated that consist of relative values that need careful quantitative scrutiny to be interpreted: the only meaning of such relative values is their rank.
- Published
- 2008
44. A spatial cross-validation strategy for interpreting predicted groundwater vulnerability to nitrate concentration in the Province of Milan
- Author
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FABBRI, ANDREA, CAVALLIN, ANGELO, Masetti, M, Poli, S, Sterlacchini, S, Chung, CJ, Fabbri, A, Cavallin, A, Masetti, M, Poli, S, Sterlacchini, S, and Chung, C
- Subjects
aquifer vulnerability, milan province ,GEO/05 - GEOLOGIA APPLICATA - Abstract
Natural and anthropogenic factors are identified as critical in characterizing aquifer vulnerability in the Milan Province study area, in which the impact of elevated concentrations of NO3 is being assessed. In this contribution, map versions of such continuous and categorical data layers are used to establish relationships between their map units and the location of over 300 water wells with nitrate levels either clearly above a threshold of 20 mg/l (impacted wells), or with wells clearly below that (non-impacted wells). The natural and anthropogenic data layers that are assumed to reflect (a) potential sources of nitrate, and (b) relative ease with which nitrate may migrate in groundwater, are: population density, nitrogen fertilizer loading, precipitation and irrigation, protective capacity of soils, land use, vadose zone permeability, groundwater depth, and groundwater velocity. Two versions of the data layers database are used in the study: one in which the data layers maintain their original value ranges and one in which they are reclassified into simplified classes. The water wells are separated first into the two groups to locate and recognize sites to be used to map high and low vulnerabilities using an empirical likelihood ratio prediction model, ELR. Further partition of the two sub-groups into prediction and validation wells allows setting up blind tests to cross-validate the predictions of relative vulnerability classes (ranks). Prediction-rate curves and tables are obtained and visualized as cumulative proportions of study area in decreasing order of predicted vulnerability class versus the corresponding relative proportion of impacted validation wells (i.e., not used to predict). A similar procedure is followed with the non-impacted well locations. Predictions are thus compared and interpreted and repeated predictions are obtained using randomized sub-sets of prediction and validation wells. Target of the strategy used is not only to assess the goodness of predictions but also to estimate their reliability levels.
- Published
- 2008
45. Proposta di una metodologia per la gestione di emergenze idrogeologiche nella Comunità Montana Valtellina di Tirano
- Author
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Sterlacchini S., Frigerio S., Canziani M., Poli S., De Amicis M., Sironi S., Sterlacchini, S, Frigerio, S, Canziani, M, Poli, S, DE AMICIS, M, and Sironi, S
- Subjects
Rischi Idrogeologici ,Piano di Protezione Civile ,GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA ,GIS, protezione civile ,GIS - Abstract
Nell'ambito della Convenzione tra la Comunità Montana Valtellina di Tirano (Sondrio, Italia) e l'Istituto per la Dinamica dei Processi Ambientali (IDPA, sezione di Milano) del Consiglio Nazionale delle Ricerche (CNR, 2004), ha preso l'avvio uno studio finalizzato allo sviluppo di metodologie informatiche atte alla gestione di rischi idrogeologici (a livello degli effetti fisici attesi, conseguenti a fenomeni potenzialmente pericolosi) e finalizzate, in ultima analisi, alla definizione di un Piano di Protezione Civile. Tale piano è stato inizialmente definito, in via del tutto sperimentale, in una porzione del comune di Grosotto (Sondrio), identificata come possibile scenario di rischio, sulla base delle informazioni a disposizione; si è inoltre tenuta in considerazione la reale struttura organizzativa delle squadre di Protezione Civile, attualmente operanti a livello comunale.
- Published
- 2007
46. 3D modelling from field data: M. Misma structure, Central Southern Alps. (Ricostruzione 3D dai dati di terreno: Strutttura del M. Misma, Sudalpino Centrale)
- Author
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Salvi, F, Sterlacchini, S, ZANCHI, ANDREA MARCO, Salvi, F, Sterlacchini, S, and Zanchi, A
- Subjects
ricostruzioni 3d, Sudalpino Geologia, strutturale ,GEO/03 - GEOLOGIA STRUTTURALE - Abstract
A 3D geological modelling methodology is briefly presented in this work. This procedure allows to reconstruct complex geological bodies using topographic and structural-geological data. The main constraints considered for the geological surfaces reconstruction are the geological cross-sections. GIS (Geographic Information System) tools and functions have been exploited for 2D data management, while gOcad® software for 3D modelling. The proposed methodology consists in three main steps: i) data acquisition; ii) data storage in a GIS; iii) 3D surface and volume reconstruction. This methodology has been applied for the 3D reconstruction of the Monte Misma anticline (Bergamo), localized in the thrust and fold systems of the frontal part of the Central Southern Alps. This 3D geological reconstruction allows to check and improve the geological interpretation of the buried surfaces. Moreover the geological surfaces and volumes definitions can be very useful in the different environment of the Earth Sciences (eg. oil exploration; numerical modelling; geophysical data processing, etc.).
- Published
- 2007
47. Civil Protection Plan: a new GIS tool for an emergency infomation management
- Author
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Sterlacchini, S, Canziani, M, Frigerio, S, Poli, S, DE AMICIS, MATTIA GIOVANNI MARIA, SIRONI, SIMONE, CAVALLIN, ANGELO, Sterlacchini, S, Canziani, M, Frigerio, S, DE AMICIS, M, Sironi, S, Poli, S, and Cavallin, A
- Subjects
gis, emergency management ,GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA - Published
- 2006
48. Valutazione e gestione del rischio da frana
- Author
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Crosta, G, Frattini, P, Sterlacchini, S, CROSTA, GIOVANNI, FRATTINI, PAOLO, Sterlacchini, S., Crosta, G, Frattini, P, Sterlacchini, S, CROSTA, GIOVANNI, FRATTINI, PAOLO, and Sterlacchini, S.
- Published
- 2001
49. GIS and 3D geological reconstruction in the Southern Alps: the Zuccone gravitational deformation, Val Taleggio (BG), Italy
- Author
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Zanchi A., Salvi F., Natoli M., De Amicis M., Jadoul F., Sterlacchini S., Zanchi, A, Salvi, F, Natoli, M, DE AMICIS, M, Jadoul, F, and Sterlacchini, S
- Subjects
3d modeling, GIS, geological mapping, structural geology ,GEO/03 - GEOLOGIA STRUTTURALE ,GIS ,Sackung ,GOCAD ,3D modeling ,Southern Alps - Abstract
A geological map can be considered one of the best tool to display the geometrical relationships among different geological bodies. Moreover their extent can be appreciated in three dimensions, applying geometrical techniques, when topographic and structural data are available. The aim of this work is to show how geological cartographic field data stored in a Geographic Information System (GIS) can be used for 3D modeling of complex geological bodies, using a procedure which has been established for this purpose. 3D reconstruction has been performed in gOcad. This software is based on the discrete smooth interpolator, which makes possible the construction of 3D surfaces, volumes and grids starting from simple elements with an atomic structure, as points and lines. These techniques, chiefly based on the use of cartographic data, have been applied to the reconstruction of a deep seated slope gravitational deformation developed within the sedimentary cover of the Southern Alps, Bergamo, Italy. The DSSGD occurs within a complex thrust stack, later affected by strike-slip and normal faults. These structures have been modelled basing on detailed structural, morpho-structural and geological field data (1:5,000-1:2,000). Photointerpretation techniques have been used for morphological analyses. All these data were firstly stored and integrated within a GIS, to be later generalized and imported into gOcad. The 3D model was reconstructed through several steps which will be described in detail. 3D modelling offers several advantages. First of all, a rigorous check of the consistency of the surface geology and of 2D interpretative sections was possible, taking to a general improvement of the geometrical interpretation of the Zuccone DSSGD and to 3D retrodeformation of the slided rock masses. Moreover the geometric features of the reconstructed geological bodies can be used to design preliminary monitoring plans or subsurface investigations through seismic surveys and drilling. In addition, the construction of 3D grids, where properties are added, can represent a starting point for geomechanical numerical modeling.
- Published
- 2004
50. 3D stratigraphic and structural reconstruction of a karstic system in the sedimentary cover of the Southern Alps (Italy)
- Author
-
Berra, F, Avaro, A, Bonavera, M, Salvi, F, Sterlacchini, S, ZANCHI, ANDREA MARCO, Berra, F, Avaro, A, Bonavera, M, Salvi, F, Sterlacchini, S, and Zanchi, A
- Subjects
GEO/03 - GEOLOGIA STRUTTURALE ,3d modeling, southern ALps, structural geology - Published
- 2004
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