Articles | Volume 369
https://doi.org/10.5194/piahs-369-175-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/piahs-369-175-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
11 Jun 2015
Evolution des pluies extrêmes dans le bassin du Chéliff (Algérie) au cours des 40 dernières années 1971–2010
Ecole Nationale Supérieure d'Hydraulique (ENSH)-Blida, Algérie
M. Meddi
Ecole Nationale Supérieure d'Hydraulique (ENSH)-Blida, Algérie
G. Mahé
HydroSciences Montpellier, IRD, France
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Cette étude consiste en la prévision des pluies dans le bassin côtier oranais en Algérie d'ici la fin du 21ème siècle, issues des modèles climatiques régionaux. D’une manière générale, les résultats de simulations ont mis en évidence une réduction de −15 % à −40 % des pluies. cette recherche est une contribution pour la mise en place d’un outil d’aide à la planification et l’élaboration d’un plan d’actions opérationnel pour la gestion durable des ressources en eau dans le secteur d’étude.
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Proc. IAHS, 385, 365–370, https://doi.org/10.5194/piahs-385-365-2024, https://doi.org/10.5194/piahs-385-365-2024, 2024
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L’objectif de ce travail est d’analyser les liens entre les indices climatiques et la variabilité des séries de précipitations et de débits. La méthode a consisté à rechercher les changements survenus dans ces données à travers la variabilité du signal. Ainsi, au niveau de l’analyse interannuelle et saisonnière, le signal indique une forte oscillation marquée par une prédominance de la couleur rouge. L’utilisation de l’indice ENSO montre que le phénomène El-Niño impacte le débit et la pluie.
Domiho Japhet Kodja, Gandomè Mayeul Leger Davy Quenum, Houteta Djan'na Koubodana, Ernest Amoussou, Isaiah Sewanu Akoteyon, Arsène Sègla Josué Akognongbé, Mahougnon Fidèle Ahéhéhinnou Yêdo, Gil Mahé, Jean-Emmanuel Paturel, Expédit Wilfrid Vissin, and Constant Houndénou
Proc. IAHS, 385, 359–364, https://doi.org/10.5194/piahs-385-359-2024, https://doi.org/10.5194/piahs-385-359-2024, 2024
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The results showed that there is an 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. 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.
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Proc. IAHS, 385, 59–64, https://doi.org/10.5194/piahs-385-59-2024, https://doi.org/10.5194/piahs-385-59-2024, 2024
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Ernest Amoussou, Félix Toundé Amoussou, Aymar Yaovi Bossa, Domiho Japhet Kodja, Henri Sourou Totin Vodounon, Constant Houndénou, Valérie Borrell Estupina, Jean-Emmanuel Paturel, Gil Mahé, Christophe Cudennec, and Michel Boko
Proc. IAHS, 385, 141–146, https://doi.org/10.5194/piahs-385-141-2024, https://doi.org/10.5194/piahs-385-141-2024, 2024
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Proc. IAHS, 384, 163–168, https://doi.org/10.5194/piahs-384-163-2021, https://doi.org/10.5194/piahs-384-163-2021, 2021
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Proc. IAHS, 384, 133–139, https://doi.org/10.5194/piahs-384-133-2021, https://doi.org/10.5194/piahs-384-133-2021, 2021
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Our multidisciplinary study reveals an alarming trend of beach retreat reaching −20 m ± 0.15 m yr−1 after the human-induced change over the hydrological network where ~ 50 % of sediment discharge has been trapped upstream the dams. Accros the semi arid north African coasts, the rapid shoreline retreat is due to the decreasing of sediment fluvial discharge trapped by the dam infrastrcture.
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The FRIEND-Water program (FWP) is the oldest and the most transverse program within the UNESCO IHP. It allows large communities of hydrologists to collaborate across borders on common shared data and scientific topics, addressed through 8 large world regions. Research priorities evolve according to the projections given by the member States during the IHP councils. FWP further activities follow the IHP IX program with the support of the Montpellier UNESCO Category II Center ICIREWAD.
Valentin Brice Ebodé, Gil Mahé, and Ernest Amoussou
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Valentin Brice Ebodé, Gil Mahé, and Ernest Amoussou
Proc. IAHS, 384, 261–267, https://doi.org/10.5194/piahs-384-261-2021, https://doi.org/10.5194/piahs-384-261-2021, 2021
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La sécheresse observée en Afrique tropicale vers la fin des années 1960, a également affecté le bassin de la Bénoué en Afrique centrale, avec une persistance remarquable qui s’est répercutée sur les écoulements. Les ruptures à la baisse ont été mises en évidence dans les séries hydropluviométriques de ce bassin au pas de temps annuel en 1970–71 (pluies) et 1971–72 (débits). Les déficits associés à cette rupture sont de −2,9 % pour les pluies et −14,2 % pour les débits.
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Ernest Amoussou, Gil Mahe, Oula Amrouni, Ansoumana Bodian, Christophe Cudennec, Stephan Dietrich, Domiho Japhet Kodja, and Expédit Wilfrid Vissin
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This short paper is the preface of the PIAHS volume of the IAHS/UNESCO FRIEND-Water conference of Cotonou in November 2021.
Golab Moussa Omar, Jean-Emmanuel Paturel, Christian Salles, Gil Mahé, and Mohamed Jalludin
Proc. IAHS, 384, 225–231, https://doi.org/10.5194/piahs-384-225-2021, https://doi.org/10.5194/piahs-384-225-2021, 2021
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Le district de Djibouti est situé dans le bassin versant de l’Oued Ambouli qui par sa nappe aquifère procure la source principale d’alimentation en eau potable de la ville de Djibouti, mais est aussi à l’origine de crues rares et brèves avec de lourds bilans humains et économiques Le développement du district se traduit par une expansion urbaine et un développement des activités qui accentuent le risque inondation.
Yves Tramblay, Nathalie Rouché, Jean-Emmanuel Paturel, Gil Mahé, Jean-François Boyer, Ernest Amoussou, Ansoumana Bodian, Honoré Dacosta, Hamouda Dakhlaoui, Alain Dezetter, Denis Hughes, Lahoucine Hanich, Christophe Peugeot, Raphael Tshimanga, and Patrick Lachassagne
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This dataset provides a set of hydrometric indices for about 1500 stations across Africa with daily discharge data. These indices represent mean flow characteristics and extremes (low flows and floods), allowing us to study the long-term evolution of hydrology in Africa and support the modeling efforts that aim at reducing the vulnerability of African countries to hydro-climatic variability.
Fatima Hara, Mohammed Achab, Anas Emran, and Gil Mahe
Proc. IAHS, 383, 159–162, https://doi.org/10.5194/piahs-383-159-2020, https://doi.org/10.5194/piahs-383-159-2020, 2020
Ali Hadour, Gil Mahé, and Mohamed Meddi
Proc. IAHS, 383, 61–68, https://doi.org/10.5194/piahs-383-61-2020, https://doi.org/10.5194/piahs-383-61-2020, 2020
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The downward of rainfall trend occurred in the study area in 1972, affecting a few coastal stations. In 1976, this decline extended to the South West and throughout the coastal region. In 1980, the drop covered the entire basin. This decline has resulted in an estimated deficit of 30 % on average in the eastern region, the coastal region and the Mina. However, the central part of the basin experienced a 20 % decrease compared to the period before the break (1968–1980).
Domiho Japhet Kodja, Arsène J. Sègla Akognongbé, Ernest Amoussou, Gil Mahé, E. Wilfrid Vissin, Jean-Emmanuel Paturel, and Constant Houndénou
Proc. IAHS, 383, 163–169, https://doi.org/10.5194/piahs-383-163-2020, https://doi.org/10.5194/piahs-383-163-2020, 2020
Zhongbo Yu, Chunhui Lu, Jianyuan Cai, Dazheng Yu, Gil Mahe, Anil Mishra, Christophe Cudennec, Henny A. J. Van Lanen, Didier Orange, and Abou Amani
Proc. IAHS, 383, 3–4, https://doi.org/10.5194/piahs-383-3-2020, https://doi.org/10.5194/piahs-383-3-2020, 2020
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The 8th Global FRIEND conference highlighted the advance in hydrological science and innovation in water management. 52 accepted papers cover study areas in precipitation and climate impact; observation, analysis and simulations of hydrologic processes; floods in the changing environments; drought monitoring and analysis; water resources and environmental impacts. The outcome of the conference presented in the proceedings will be shared and discussed widely among UNESCO IHP networks.
Thouraya Benmoussa, Oula Amrouni, Laurent Dezileau, Gil Mahé, and Saâdi Abdeljaouad
Proc. IAHS, 377, 77–81, https://doi.org/10.5194/piahs-377-77-2018, https://doi.org/10.5194/piahs-377-77-2018, 2018
Ernest Amoussou, Henri S. Totin Vodounon, Expédit W. Vissin, Gil Mahé, and Marc Lucien Oyédé
Proc. IAHS, 377, 91–96, https://doi.org/10.5194/piahs-377-91-2018, https://doi.org/10.5194/piahs-377-91-2018, 2018
Fatma Kotti, Laurent Dezileau, Gil Mahé, Hamadi Habaieb, Malik Bentkaya, Claudine Dieulin, and Oula Amrouni
Proc. IAHS, 377, 67–76, https://doi.org/10.5194/piahs-377-67-2018, https://doi.org/10.5194/piahs-377-67-2018, 2018
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This study was designed to prove that the coastal changes of the Gulf of Tunis are mainly driven by the changes of the hydrological regime of the Medjerda river due to dams. We sampled cores of sediments in the low valley just before the sea, and analyzed them. They show the dramatic reduction of sediment supply after 1981, date of construction of the largest dam of Sidi Salem, and the disappearance of sand in the fluvial sediments.
Gil Mahe, Kate Heal, Akhilendra B. Gupta, and Hafzullah Aksoy
Proc. IAHS, 377, 1–1, https://doi.org/10.5194/piahs-377-1-2018, https://doi.org/10.5194/piahs-377-1-2018, 2018
Kenza Khomsi, Gil Mahe, Yves Tramblay, Mohamed Sinan, and Maria Snoussi
Nat. Hazards Earth Syst. Sci., 16, 1079–1090, https://doi.org/10.5194/nhess-16-1079-2016, https://doi.org/10.5194/nhess-16-1079-2016, 2016
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The study investigates trends in mean and extreme rainfall, run-off, temperature and their relationship with large-scale atmospheric circulation. It focuses on two Moroccan watersheds; Bouregreg and Tensift, using data from 1977 to 2003. Results do not show a homogeneous behaviour in the catchments; the influence of the large-scale atmospheric circulation is different and a clear spatial dependence of the trend analysis is linked to the distance from the coast and the mountains.
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Short summary
Cette étude vise à analyser les tendances des pluies extrêmes dans un bassin semi-aride du Nord de l’Algérie et leur relation avec les types de circulation atmosphérique. Les pluies totales et l’intensité journalière ont connu une baisse significative durant la période 1971-2010 montre des tandis que leur fréquence ne montre pas de changement significatif.
L’oscillation méditerranéenne est le type de circulation qui influence la variabilité des pluies extrêmes du bassin du Chéliff
Cette étude vise à analyser les tendances des pluies extrêmes dans un bassin semi-aride du...
