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4. Statistical Study of Rainfall and Sediment Transport in the North-West of Algeria

Author

Hallouz, Faiza, Meddi, Mohamed, Mahé, Gil, Rahmani, Salah Eddine Ali, Chebana, Fateh, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Gawad, Iman O., Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, Kallel, Amjad, editor, Barbieri, Maurizio, editor, Rodrigo-Comino, Jesús, editor, Chaminé, Helder I., editor, Merkel, Broder, editor, Chenchouni, Haroun, editor, Knight, Jasper, editor, Panda, Sandeep, editor, Khélifi, Nabil, editor, Benim, Ali Cemal, editor, Grab, Stefan, editor, El-Askary, Hesham, editor, Banerjee, Santanu, editor, Hadji, Riheb, editor, and Eshagh, Mehdi, editor

Published
2023
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5. Sediment Type and Their Relation to the Presence of Seagrass Posidonia oceanica in the Mediterranean Lagoon

Author

Mustapha, Karim Ben, Hzami, Abderraouf, Amrouni, Oula, Hammami, Aya, Montigny, Chrystelle, Mahé, Gil, Missaoui, Hechmi, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Gawad, Iman O., Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, Çiner, Attila, editor, Khan, Md Firoz, editor, Kallel, Amjad, editor, Rodrigo-Comino, Jesús, editor, Parise, Mario, editor, Barzegar, Rahim, editor, Ergüler, Zeynal Abiddin, editor, Khelifi, Nabil, editor, and Ali, Imran, editor

Published
2023
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6. Regional flood frequency analysis in North Africa

Author

Tramblay, Yves, El Khalki, El Mahdi, Khedimallah, Abderrahmane, Sadaoui, Mahrez, Benaabidate, Lahcen, Boulmaiz, Tayeb, Boutaghane, Hamouda, Dakhlaoui, Hamouda, Hanich, Lahoucine, Ludwig, Wolfgang, Meddi, Mohamed, Elmehdi Saidi, Mohamed, and Mahé, Gil

Published
2024
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7. Assessment of Water Soil Erosion by RUSLE Model Using Remote Sensing and GIS in Wadi Cheliff Basin (Algeria)

Author

Toumi, Samir, Meddi, Mohamed, Mahé, Gil, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, El-Askary, Hesham, editor, Erguler, Zeynal Abiddin, editor, Karakus, Murat, editor, and Chaminé, Helder I., editor

Published
2022
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15. Grain Size Distribution and Enrichment Evaluation of Trace Metals in the Mediterranean Harbor Lagoon (Kalaât Andalous, Tunisa)

Author

Khsiba, Samia, Amrouni, Oula, Bancon-Montigny, Chrystelle, Mustapha, Karim Ben, Chouba, Lassaad, Gaâloul, Nadia, Mahé, Gil, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Doronzo, Domenico M., editor, Schingaro, Emanuela, editor, Armstrong-Altrin, John S., editor, and Zoheir, Basem, editor

Published
2019
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16. Recent Geochemical and Grain Size Distribution of Terrestrial Sediment in Coastal Area from the Watershed of Medjerda River, Gulf of Tunis

Author

Benmoussa, Thouraya, Amrouni, Oula, Dezileau, Laurent, Mahé, Gil, Chiarella, Domenico, Abdeljaouad, Saâdi, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Boughdiri, Mabrouk, editor, Bádenas, Beatriz, editor, Selden, Paul, editor, Jaillard, Etienne, editor, Bengtson, Peter, editor, and Granier, Bruno R.C., editor

Published
2019
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17. Multidisciplinary Approaches for the Study of Sediment Discharges to the Mediterranean Sea to Mitigate the Impact of Climate and Anthropogenic Activities on Coastal Environments

Author

Amrouni, Oula, Mahé, Gil, Abdeljaouad, Saâdi, Abichou, Hakim, Hattour, Abdallah, Akrout, Nejmeddine, Bancon-Montigny, Chrystelle, Benmoussa, Thouraya, Mustapha, Kerim Ben, Chouba, Lassâad, Chiarella, Domenico, Condomines, Michel, Dezileau, Laurent, Dieulin, Claudine, Gaaloul, Nadia, Ghadoum, Ahmed, Hzami, Abderraouf, Khelifi, Nabil, Khsiba, Samia, Kotti, Fatma, Medhioub, Mounir, Missaoui, Hechmi, Sabatier, François, Sánchez, Alberto, Satta, Alessio, Sebei, Abdelaziz, Ouertani, Wième, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Boughdiri, Mabrouk, editor, Bádenas, Beatriz, editor, Selden, Paul, editor, Jaillard, Etienne, editor, Bengtson, Peter, editor, and Granier, Bruno R.C., editor

Published
2019
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19. Some like it complex: building a common multidisciplinarity background from local experiences within the South-Mediterranean environmental research communities

Author

Saqalli, Mehdi, primary, Kupelian, Laurent, additional, Chakroun, Hedia, additional, Mahé, Gil, additional, Khater, Carla, additional, Drapeau, Laurent, additional, Fenianos, Johnny, additional, Cartier, Stéphane, additional, Chaabane, Zohra Lili, additional, Probst, Jean-Luc, additional, and Saenz, Melio, additional

Published
2023
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20. Comparative study from ground-based rain gauges vs. rainfall products at different time steps in the southeast of the Republic of Djibouti.

Author

Omar, Golab Moussa, Paturel, Jean-Emmanuel, Salles, Christian, Mahé, Gil, Jalludin, Mohamed, Satgé, Frédéric, Ismail Nour, Mohamed, and Hassan Hersi, Abdillahi

Subjects
SMALL states, RAIN gauges, EARTH stations, COMPARATIVE studies
Abstract

The Republic of Djibouti is a small country in the Horn of Africa and as for most regions of Africa, ground rainfall stations are sparse. This study aims to compare at different time steps (annual, monthly, and daily) 15 rainfall estimation products (P-datasets) to 5 reference ground-based rainfall stations, over the period of 1980–1990. To classify the reliability of these products, several metrics were considered, the Kling Gupta Efficiency (KGE) and the Heidle Skills Scores (HSS at daily time step). For the study area, 5 P-datasets present high KGE values at annual and monthly time step: EWEMBI, GPCC, JRA-55 Adj, MSWEP and WFDEI-GPCC; the best 5 performing products at daily time step are CHIRPS, EWEMBI, JRA-55 Adj, MSWEP and WFDEI-GPCC. To complete this comparative analysis, it will be necessary to perform an analysis at the watershed scale and on a new temporal window. [ABSTRACT FROM AUTHOR]

Published
2024
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21. On the Growing Socioeconomic Vulnerability of Southern Mediterranean Coastal Lagoons.

Author

Hzami, Abderraouf, Amrouni, Oula, Heggy, Essam, Mahé, Gil, and Missaoui, Hechmi

Subjects
LAGOONS, BATHYMETRIC maps, TOPOGRAPHIC maps, SHORELINE monitoring, URBAN growth, CLIMATE extremes, COASTAL changes
Abstract

Due to pronounced hydroclimatic fluctuations and rapid urban growth, coastal lagoonal systems in the Southern Mediterranean semi-arid areas undergo pronounced shoreline retreats and increased coastal floodings. The socioeconomic impacts of these alarming coastal changes remain poorly uncharacterized. To address this deficiency, we calculate the Socioeconomic Vulnerability Index (SVI) based on the decadal changes in shoreline retreat and land use occupation considering the study case of the coastal lagoon of Ghar El Melh in Tunisia which is representative of several lagoonal systems in the southern Mediterranean basin. We first monitor the diachronic shoreline changes from 1882 to 2016 using aerial and orbital photogrammetric scenes combined with topographic and bathymetric maps. Using the Digital Shoreline Analysis System (DSAS) and historic bathymetric records, we then measure the changes in shoreline position from 1882 to 2016. Secondly, the above is correlated with the Land Use/Land Cover (LULC) assessment using a supervised classification algorithm from multiple Landsat 5-8 orbital photogrammetric scenes. We assess the SVI using five socioeconomic parameters: (1) population density, (2) land use change, (3) road network, and (4) settlements. Our results reveal the occurrence of severe coastal erosion with a maximum Net Shoreline Movement of -1580 m (±6 m) between 1882 and 2016. Moreover, the changes in land use from 1985 to 2021 reveal the extension in urban growth around the lagoon, rising from 5.4 % to 13.5 %. Whereas the vegetation coverage is decreasing by 9 % over the same period. The resulting SVI map reveals that 85 % of the lagoon area is characterized by high to very high vulnerability. This high coastal vulnerability is found to be primarily due to the extensive change in land occupation over the last few decades and is aggravated by the increase in hydroclimatic extremes. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Analyse en ondelettes des séries temporelles aux stations de pluies et débits dans le bassin versant de Tortiya amont (Nord de la Côte d'Ivoire).

Author

Amalaman, Marc Auriol, Mahé, Gil, Diomande, Béh Ibrahim, Tra Bi, Armand Zamblé, Rouché, Nathalie, Nouaceur, Zeineddine, and Laignel, Benoit

Abstract

Copyright of Proceedings of the International Association of Hydrological Sciences (PIAHS) is the property of Copernicus Gesellschaft mbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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23. Investigation of drought and flooding areas in coastal countries of West Africa in the context of global warming.

Author

Kodja, Domiho Japhet, Quenum, Gandomè Mayeul Leger Davy, Koubodana, Houteta Djan'na, Amoussou, Ernest, Akoteyon, Isaiah Sewanu, Akognongbé, Arsène Sègla Josué, Ahéhéhinnou Yêdo, Mahougnon Fidèle, Mahé, Gil, Paturel, Jean-Emmanuel, Vissin, Expédit Wilfrid, and Houndénou, Constant

Subjects
DROUGHT management, GLOBAL warming, RAINFALL, DROUGHTS, FLOODS, WATER supply, TREND analysis
Abstract

This study investigated drought and flooding changes in West Africa between 1983–2012 and projected near future (2025–2054) periods. The datasets used are the CHIRTS and CHIRPS-2 for observed reanalysis and five (05) models of ISIMIP2b for Shared Socio-economic Pathways (SSP1.2-6 and SSP5-8.5). Extremely and very wet days total precipitation (R95pTOT; R99pTOT) and Standardized Precipitation Evapotranspiration Index (SPEI) were employed to investigate floods and drought spatial distribution using Sen Slope trend analysis method. The results showed that there is a variability in the spatial distribution of extreme indices with an upward and downward trend of dry and wet rainfall periods in West Africa in both historical and projected periods. This observation suggests that the study area is faced with rainfall variability marked by extreme events. A further examination on the spatial and temporal distribution of flood occurrence showed that more flood events were observed in the Gulf of Guinea and Savannah countries, followed by an increase in uniform spatial distribution and moderate wet days both under SSP1.2.6, and SSP 5.8.5. In addition, result showed that an upward trend in wet periods can cause the occurrence of extreme events associated with floods in the context of global warming. However, with these scenarios negative changes are not excluded in the East, the Sahel and some western part of the Gulf of Guinea in the study area for the SSP5.8.5 scenario. Thus, the results revealed that the spatio- temporal variability of extreme rainfall can have repercussions on the hydrological functioning of watersheds, water availability and water-dependent activities. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Use of the HEC RAS model for the analysis of exceptional floods in the Ouémé basin.

Author

Amoussou, Ernest, Amoussou, Félix Toundé, Bossa, Aymar Yaovi, Kodja, Domiho Japhet, Totin Vodounon, Henri Sourou, Houndénou, Constant, Borrell Estupina, Valérie, Paturel, Jean-Emmanuel, Mahé, Gil, Cudennec, Christophe, and Boko, Michel

Subjects
FLOOD risk, FLOODS, ECOLOGICAL forecasting, HYDRAULIC structures, RIPARIAN areas, WATERSHEDS
Abstract

The Ouémé River basin extends over almost half of Benin's territory, entirely located in a humid tropical climate. This river system includes a deltaic zone (delta of the Ouémé) known for its high agricultural potential and thus subject to a socio-economic development agenda. The Ouémé delta is facing recurrent floods that maintain rural agricultural population into a retrograding crisis with significant damages such as losses of properties. The objective of this study is to improve decision-making in the Ouémé basin through the simulation of exceptional floods using the HEC-RAS model. The HEC RAS model is a conceptual model, which works through mathematical and physical formulas to implement environmental phenomena for forecasting, understanding and analysis purposes. The model inputs used are basin GIS data, hydro-meteorological data, characteristics of existing hydraulic structures, etc. The targeted outputs include 1D/2D/3D view plans with support of satellite images, tables, graphs and curves. It is worth mentioning that the model provides outputs compatible with other tools, such as civil engineering (Civil 3D, Revit, Infraworks, etc.) and GIS, that help to expand the valorization fields. The implementation of the model in the Ouémé basin has made it possible to note: (i) that the recurring effect of losses and damages is justified by the settlement of the population on the river banks; (ii) that there is an important agricultural production in areas of high flood risk; (iii) that depending on the occurrence of the phenomenon, the flooded extent and the height of submersion remains variable, and more important for extreme flooding; (iv) about 12.07 % occurrence of river flood against 13.24 % for flash flood at a return period of 30 years. Moreover, it is very relevant to note that most of flood waters converge to the western part of the basin (an area with a low risk of flooding, stretched over 63.68 km 2) and to the eastern part around the Damè-Wogon depression (an area at high risk of flooding, stretched over 10.49 km 2). [ABSTRACT FROM AUTHOR]

Published
2024
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29. Human Impact on the Morpho-Sedimentary Evolution on the Coastal Deltaic Zones (Case of Application: Artificial Canal of Medjerda River, Tunisa)

Author

Benmoussa, Thouraya, Amrouni, Oula, Hzami, Abderraouf, Dezileau, Laurent, Mahe, Gil, Abdeljaouad, Saâdi, Abdalla, Hassan, Series editor, Abdul Mannan, Md., Series editor, Alalouch, Chaham, Series editor, Attia, Sahar, Series editor, Boemi, Sofia Natalia, Series editor, Bougdah, Hocine, Series editor, Bozonnet, Emmanuel, Series editor, De Bonis, Luciano, Series editor, Hawkes, Dean, Series editor, Kostopoulou, Stella, Series editor, Mahgoub, Yasser, Series editor, Mesbah Elkaffas, Saleh, Series editor, Mohareb, Nabil, Series editor, O. Gawad, Iman, Series editor, Oostra, Mieke, Series editor, Pignatta, Gloria, Series editor, Pisello, Anna Laura, Series editor, Rosso, Federica, Series editor, Kallel, Amjad, editor, Ksibi, Mohamed, editor, Ben Dhia, Hamed, editor, and Khélifi, Nabil, editor

Published
2018
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33. Modeling and Practice of Erosion and Sediment Transport under Change

Author

Meddi, Mohamed, Aksoy, Hafzullah, and Mahé, Gil

Abstract

Climate and anthropogenic changes impact the conditions of erosion and sediment transport in rivers. Rainfall variability and, in many places, the increase of rainfall intensity have a direct impact on rainfall erosivity. Increasing changes in demography have led to the acceleration of land cover changes in natural areas, as well as in cultivated areas, and, sometimes, in degraded areas and desertified landscapes. These anthropogenized landscapes are more sensitive to erosion. On the other hand, the increase in the number of dams in watersheds traps a great portion of sediment fluxes, which do not reach the sea in the same amount, nor at the same quality, with consequences on coastal geomorphodynamics. This book is dedicated to studies on sediment fluxes from continental areas to coastal areas, as well as observation, modeling, and impact analysis at different scales from watershed slopes to the outputs of large river basins. This book is concentrated on a number of keywords: “erosion” and “sediment transport”, “model” and “practice”, and “change”. The keywords are briefly discussed with respect to the relevant literature. The contributions in this book address observations and models based on laboratory and field data, allowing researchers to make use of such resources in practice under changing conditions.

Published
2019

39. Large-Scale Climatic Drivers of Flood Frequency across Sub-Saharan Africa

Author

Ekolu, Job, primary, Dieppois, Bastien, additional, Eden, Jonathan, additional, Tramblay, Yves, additional, Villarini, Gabriele, additional, Moulds, Simon, additional, Slater, Louise, additional, Mahé, Gil, additional, Paturel, Jean-Emmanuel, additional, Sidibe, Moussa, additional, Camberlin, Pierre, additional, Pohl, Benjamin, additional, and van de Wiel, Marco, additional

Published
2023
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40. Regional flood frequency in North Africa

Author

Tramblay, Yves, primary, El Khalki, El Mahdi, additional, Sadaoui, Mahrez, additional, Benaabidate, Lahcen, additional, Boulmaiz, Tayeb, additional, Boutaghane, Hamouda, additional, Dakhlaoui, Hamouda, additional, Hanich, Lahoucine, additional, Meddi, Mohamed, additional, Ludwig, Wolfgang, additional, Saidi, Mohamed Elmehdi, additional, and Mahé, Gil, additional

Published
2023
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41. River runoff estimation with satellite rainfall in Morocco

Author

Tramblay, Yves, primary, El Khalki, El Mahdi, additional, Ciabatta, Luca, additional, Camici, Stefania, additional, Hanich, Lahoucine, additional, Saidi, Mohamed El Mehdi, additional, Ezzahouani, Abdellatif, additional, Benaabidate, Lahcen, additional, Mahé, Gil, additional, and Brocca, Luca, additional

Published
2023
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42. Impact of Climate Variability on Hydrology of the Western Mitidja Watershed, Algeria

Author

Hallouz, Faiza, Karahacane, Hafsa, Meddi, Mohamed, Mahe, Gil, Sadi, Fadhila, Benchikh, Hanane, Kemmerchou, Faiza, Abdalla, Hassan, Series editor, Abdul Mannan, Md., Series editor, Alalouch, Chaham, Series editor, Attia, Sahar, Series editor, Boemi, Sofia Natalia, Series editor, Bougdah, Hocine, Series editor, Bozonnet, Emmanuel, Series editor, De Bonis, Luciano, Series editor, Hawkes, Dean, Series editor, Kostopoulou, Stella, Series editor, Mahgoub, Yasser, Series editor, Mesbah Elkaffas, Saleh, Series editor, Mohareb, Nabil, Series editor, O. Gawad, Iman, Series editor, Oostra, Mieke, Series editor, Pignatta, Gloria, Series editor, Pisello, Anna Laura, Series editor, Rosso, Federica, Series editor, Kallel, Amjad, editor, Ksibi, Mohamed, editor, Ben Dhia, Hamed, editor, and Khélifi, Nabil, editor

Published
2018
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43. Assessment of the Impact of Dams on River Regimes, Sediment Transports to the Sea, and Coastal Changes

Author

Mahe, Gil, Amrouni, Oula, Moussa, Thouraya Ben, Dezileau, Laurent, El Aoula, Rajae, Habaieb, Hamadi, Hzami, Abderraouf, Kacimi, Ilias, Khedimallah, Abderrahmane, Kotti, Fatma, Meddi, Mohamed, Mhammdi, Nadia, Abdeljaouad, Saadi, Abdalla, Hassan, Series editor, Abdul Mannan, Md., Series editor, Alalouch, Chaham, Series editor, Attia, Sahar, Series editor, Boemi, Sofia Natalia, Series editor, Bougdah, Hocine, Series editor, Bozonnet, Emmanuel, Series editor, De Bonis, Luciano, Series editor, Hawkes, Dean, Series editor, Kostopoulou, Stella, Series editor, Mahgoub, Yasser, Series editor, Mesbah Elkaffas, Saleh, Series editor, Mohareb, Nabil, Series editor, O. Gawad, Iman, Series editor, Oostra, Mieke, Series editor, Pignatta, Gloria, Series editor, Pisello, Anna Laura, Series editor, Rosso, Federica, Series editor, Kallel, Amjad, editor, Ksibi, Mohamed, editor, Ben Dhia, Hamed, editor, and Khélifi, Nabil, editor

Published
2018
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45. Use of the HEC RAS model for the analysis of exceptional floods in the Ouémé basin

Author

Amoussou Ernest, Amoussou Toundé Félix, Bossa Yaovi Aymar, Kodja Domiho Japhet, Totin Vodounon Sourou Henri, Houndénou Constant, Borrel Valérie, Paturel Jean-Emmanuel, Mahé Gil, Cudennec Christophe, and Boko Michel

Abstract

The Ouémé River basin extends over almost half of Benin's territory, entirely located in a humid tropical climate. This river system includes a deltaic zone (delta of the Ouémé) known for its high agricultural potential and thus subject to a socio-economic development agenda. The Ouémé delta is facing recurrent floods that maintain rural agricultural population into a retrograding crisis with significant damages such as losses of properties. The objective of this study is to improve decision-making in the Ouémé basin through the simulation of exceptional floods using the HEC-RAS model.The HEC RAS model is a conceptual model, which works through mathematical and physical formulas to implement environmental phenomena for forecasting, understanding and analysis purposes. The model inputs used are basin GIS data, hydro-meteorological data, characteristics of existing hydraulic structures, etc. The targeted outputs include 1D/2D/3D view plans with support of satellite images, tables, graphs and curves. It is worth mentioning that the model provides outputs compatible with other tools, such as civil engineering (Civil 3D, Revit, Infraworks, etc.) and GIS, that help to expand the valorization fields.The implementation of the model in the Ouémé basin has made it possible to note: (i) that the recurring effect of losses and damages is justified by the settlement of the population on the river banks; (ii) that there is an important agricultural production in areas of high flood risk; (iii) that depending on the occurrence of the phenomenon, the flooded extent and the height of submersion remains variable, and more important for extreme flooding; (iv) about 12.07% occurrence of river flood against 13.24% for flash flood at a return period of 30 years. Moreover, it is very relevant to note that most of flood waters converge to the western part of the basin (an area with a low risk of flooding, stretched over 63.68 km²) and to the eastern part around the Damè-Wogon depression (an area at high risk of flooding, stretched over 10.49 km²).Key words: Ouémé River Basin, HEC-RAS ​​model, exceptional flood, Return period

Published
2022

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