8 results on '"Teatini, Pietro"'
Search Results
2. Application of Airborne Electromagnetics to Effective Hydrogeological Modelling of Delicate Coastal Areas
- Author
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Viezzoli, Andrea, Tosi, Luigi, and Teatini, Pietro
- Published
- 2011
3. Characterizing marshland compressibility by an in-situ loading test: design and set-up of an experiment in the Venice Lagoon.
- Author
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Teatini, Pietro, Da Lio, Cristina, Tosi, Luigi, Bergamasco, Alessandro, Pasqual, Stefano, Simonini, Paolo, Girardi, Veronica, Zorzan, Paolo, Zoccarato, Claudia, Ferronato, Massimiliano, Roner, Marcella, Marani, Marco, D'Alpaos, Andrea, Cola, Simonetta, and Zambon, Giuseppe
- Subjects
COMPRESSIBILITY ,SOIL compaction ,LAGOONS ,MARSHES ,SEA level - Abstract
The fate of coastal marshlands in the near future will strongly depend on their capability to maintain their elevation above a rising mean sea level. Together with the deposition of inorganic sediments during high tides, organic soil production by halophytic vegetation, and organic matter decomposition, land subsidence due to natural soil compression is a major factor controlling the actual elevation of salt-marsh platforms. Due to their high porosity and compressibility, the marsh sedimentary body undergoes large compression because of the load of overlying more recent deposits. The characterization of the geotechnical properties of these deposits is therefore of paramount importance to quantify consolidation versus accretion and relative sea level rise. However, undisturbed sampling of this loose material is extremely challenging and lab tests on in-situ collected samples are not properly representative of in-situ conditions due to the scale effects in highly heterogeneous silty soils such as those of the Venice lagoon. To overcome this limitation, an in-situ loading test was carried out in the Lazzaretto Nuovo salt-marsh in the Venice Lagoon, Italy. The load is obtained by a number of plastic tanks that are filled with seawater, reaching a cumulative load of 40 kN applied on a 2.5×1.8 m 2 surface. Specific instrumentations were deployed before positioning the tanks to measure soil vertical displacement at various depths below the load (0, 10, and 50 cm) and distances (0, 40, and 80 cm) from the load centre. Moreover, six pressure transducers were used to record overpressure dissipation over time. The collected datasets will be interpreted through a 3-D flow-deformation model that, once calibrated, provides reliable estimates of the compressibility values for each monitored depth interval. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
4. Hydrogeological effects of dredging navigable canals through lagoon shallows. A case study in Venice.
- Author
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Teatini, Pietro, Isotton, Giovanni, Nardean, Stefano, Ferronato, Massimiliano, Mazzia, Annamaria, Da Lio, Cristina, Zaggia, Luca, Bellafiore, Debora, Zecchin, Massimo, Baradello, Luca, Cellone, Francisco, Corami, Fabiana, Gambaro, Andrea, Libralato, Giovanni, Morabito, Elisa, Ghirardini, Annamaria Volpi, Broglia, Riccardo, Zaghi, Stefano, and Tosi, Luigi
- Subjects
DREDGING & the environment ,CANALS ,LAGOONS ,HYDROLOGY - Abstract
For the first time a comprehensive investigation has been carried out to quantify the possible effects of dredging a navigable canal on the hydrogeological system underlying a coastal lagoon. The study is focused on the Venice Lagoon, Italy, where the port authority is planning to open a new 10m deep and 3 km long canal to connect the city passenger terminal to the central lagoon inlet, thus avoiding the passage of large cruise ships through the historic center of Venice. A modeling study has been developed to evaluate the short (minutes), medium (months), and long (decades) term processes of water and pollutant exchange between the shallow aquifer system and the lagoon, possibly enhanced by the canal excavation, and ship wakes. An in-depth characterization of the lagoon subsurface along the channel has supported the numerical modeling. Piezometer and sea level records, geophysical acquisitions, laboratory analyses of groundwater and sediment samples (chemical analyses and ecotoxicity testing), and the outcome of 3-D hydrodynamic and computational fluid dynamic (CFD) models have been used to set up and calibrate the subsurface multi-model approach. The numerical outcomes allow us to quantify the groundwater volume and estimate the mass of anthropogenic contaminants (As, Cd, Cu, Cr, Hg, Pb, Se) likely leaked from the nearby industrial area over the past decades, and released into the lagoon from the canal bed by the action of depression waves generated by ships. Moreover, the model outcomes help to understand the effect of the hydrogeological layering on the propagation of the tidal fluctuation and salt concentration into the shallow brackish aquifers underlying the lagoon bottom. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
5. On the uniformity of anthropogenic Venice uplift.
- Author
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Gambolati, Giuseppe, Teatini, Pietro, Ferronato, Massimiliano, Strozzi, Tazio, Tosi, Luigi, and Putti, Mario
- Subjects
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LAGOONS , *BRACKISH waters , *SALINE waters , *LAKES , *SALT springs - Abstract
A programme of Venice uplift because of seawater injection into a 600–800 m deep brackish aquifer underlying the lagoon has recently been advanced. As the actual spatial variability of the hydro-geological parameters is to a large extent unknown, a controversial issue concerns the 25–30 cm heave prediction with the possible generation of differential displacements that might jeopardize the integrity of the architectural patrimony. It is shown that significant differential displacements have occurred in Venice in the past and are still presently occurring as evidenced by SAR interferometry. The results of a stochastic analysis addressing the variability of the hydraulic conductivity of the injected formation indicate that even a highly uneven aquifer expansion does not migrate to ground surface because of the smoothing effect exerted by the overburden. The predicted differential displacements are well below the values Venice is experiencing. Any a priori alarmism appears to be unfounded and unjustified. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
6. Eustacy and land subsidence in the Venice Lagoon at the beginning of the new millennium
- Author
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Carbognin, Laura, Teatini, Pietro, and Tosi, Luigi
- Subjects
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GROUNDWATER , *ABSOLUTE sea level change , *LAGOONS - Abstract
Venetian land subsidence, both natural and induced by groundwater withdrawal, and northern Adriatic Sea eustasy have caused 23 cm of relative land subsidence referred to as the mean sea level over the last 100 years. This relative elevation loss has been vital for Venice''s existence, inasmuch as Venice lives in the water. After a short overview of the process during the past decades, the actual trend of relative ground-sea movement is presented by integrating high precision leveling, remote sensing measurements and tide gauge records. Geodetic and Interferometric Synthetic Aperture Radar (InSAR) data evidence the present ground stability of the central part of the lagoon, where the city of Venice is located, and slight sinking rates at the northern and southern extremities of the lagoon edges (3–5 mm/year) and at some places in the central and northern littorals (1–3 mm/year). At the same time, the latest tide gauge records indicate a renewal in the sea-level rising trend. Within the average secular eustatic rate of 1.13 mm/year, the value of -0.89 mm/year, observed near Venice during the period 1971–1993, increased to 1.53 mm/year when adding the records up to 2002. [Copyright &y& Elsevier]
- Published
- 2004
- Full Text
- View/download PDF
7. Identification of the Origins of Vadose-Zone Salinity on an Agricultural Site in the Venice Coastland by Ionic Molar Ratio Analysis.
- Author
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Zancanaro, Ester, Teatini, Pietro, Scudiero, Elia, and Morari, Francesco
- Subjects
SOIL matric potential ,RATIO analysis ,GROUNDWATER monitoring ,SOIL salinity ,SOIL moisture ,SALTWATER encroachment ,LAGOONS - Abstract
Saltwater contamination seriously affects water quality and land productivity of reclaimed farmlands along the Venice Lagoon, Italy. To characterize the hydrogeochemical dynamics involved in this phenomenon, a three-year study was carried out in an experimental field located at the southern margin of the Venice Lagoon. Soil matric potential, quality of soil pore water and groundwater, and soil physical and chemical properties were monitored at five monitoring stations. Relationships between Cl
− , Na+ , Mg2+, Ca2+ , K+ , SO4 2− , Br− ionic concentrations, and electrical conductivity of the water samples with the soil characteristics (e.g., texture, exchangeable cations) were investigated. Soil water flux direction was calculated and related to ion concentrations. Moreover, specific molar ratios (Mg/Ca, Na/Cl, Cl/Br, and SO4 /Cl) were calculated to identify the main drivers affecting salinity in the field. The study confirmed that the experimental site was strongly affected by soil and water salinity, and two major contamination dynamics were identified. The first one was mainly driven by seawater intrusion from the near lagoon and salty watercourses, while the second was derived by the interactions between the peaty soil and salts that were originally in place, since the area was only reclaimed a few decades ago. The latter highlighted the potentiality of the experimental field to become an acidic sulfate environment. Ionic ratios were implemented and proved to be an important tool for the identification of salinity origin. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
8. Land Subsidence in Coastal Environments: Knowledge Advance in the Venice Coastland by TerraSAR-X PSI.
- Author
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Tosi, Luigi, Lio, Cristina Da, Teatini, Pietro, and Strozzi, Tazio
- Subjects
COASTAL ecology ,SYNTHETIC aperture radar ,INTERFEROMETRY ,LAGOONS ,REMOTE sensing - Abstract
The use of satellite SAR interferometric methods has significantly improved the monitoring of ground movements over the last decades, thus opening new possibilities for a more accurate interpretation of land subsidence and its driving mechanisms. TerraSAR-X has been extensively used to study land subsidence in the Venice Lagoon, Italy, with the aim of quantifying the natural and anthropogenic causes. In this paper, we review and update the main results achieved by three research projects supported by DLR AOs (German Aerospace Center Announcement of Opportunity) and conducted to test the capability of TerraSAR-X PSI (Persistent Scatterer Interferometry) to detect ground movements in the complex physiographic setting of the Venice transitional coastal environment. The investigations have been focused on the historical center of Venice, the lagoon inlets where the MoSE is under construction, salt marshes, and newly built-up areas in the littoral. PSI on stacks of stripmap TerraSAR-X images covering short- to long-time periods (i.e., the years 2008–2009, 2008–2011 and 2008–2013) has proven particularly effective to measure land subsidence in the Venice coastland. The very high spatial resolution (3 m) and the short repeat time interval (11 days) of the TerraSAR-X acquisitions make it possible to investigate ground movements with a detail unavailable in the past. The interferometric products, properly calibrated, allowed for a millimetric vertical accuracy of the land movements at both the regional and local scales, even for short-term analyses, i.e., spanning one year only. The new picture of the land movement resulted from processing TerraSAR-X images has significantly contributed to update the knowledge on the subsidence process at the Venice coast. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
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