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Atmospheric and Climate Sciences 2022年第4期12卷 635-647页

作者： Kanakounou Jean-Marie Kone Vamara Kone Kouassi Aimé Yao Kouassi Paul Anoh centre de recherches océanologiques Abidjan C&#244 te d’Ivoire Institut de Géographie Tropicale Université Félix Houphou&#235 t Boigny Abidjan C&#244 te d’Ivoire

Atmospheric dynamics and climatology in West Africa are strongly dominated by the latitudinal migration of the ITCZ which imposes directly or indirectly determinism on coastal ecosystems. Thus, the Grand-Lahou lagoon system and its watershed are influenced by the ITCZ, whose seasonal study made it possible to understand its mode of action first on climatic factors, then hydroclimatic, and finally hydrological in the context of global changes. The study of these factors showed a differentiated impact of its migration on the hydrological regime defining a new configuration of the lagoon system and beyond;the coastal ecosystems of the northern coast of the Gulf of Guinea irrigated by numerous fluvial inputs. Salinity, a hydrological parameter of critical ecosystem importance, combined with transparency and depth, has enabled the spatio-temporal description of hydrology. To do this, a series of monthly measurements (in-situ) for spatial coverage of 25 stations was tested. Long before that, the climatic and hydroclimatic parameters were obtained respectively at SOdeXAM, the meteorological site *** and ONAde. This study brought together the dynamics of the ITCZ and the hydrological system of the lagoon.

关键词： Climate Change Dynamics of the ITCZ Hydro-Climatic Regime Grand-Lahou Lagoon System Coastal Ecosystems

Assessment and Impact of Leachate Generated by the Landfill City in Abidjan on the Quality of Ground Water and Surface Water (M’Badon Bay, Côte d’Ivoire)

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Journal of Water Resource and Protection 2018年第1期10卷 145-165页

作者： Sangaré Naminata Kouassi Edith Kwa-Koffi Kouassi Aka Marcel Yao Koffi Marcellin Laboratoire de Chimie Physique Université Félix Houphou&euml t Boigny Abidjan C&ocirc te d’Ivoire centre de recherches océanologiques (CRO) Abidjan C&ocirc te d’Ivoire

The municipal Akouedo landfill of the city of Abidjan (Cote d’Ivoire) is composed of more than 60% of household waste. It lacks a leachate collecting and treatment device. To highlight the impact of the leachate on the receiving environments, some sampling campaigns of leachate, groundwater and surface waters were conducted from June 2013 to January 2014. Analyses of leachate samples revealed relatively high concentrations of trace metals: Fe (6450 ± 8690 μg/L), Cu (400 ± 272 μg/L), Zn (520 ± 240 μg/L), Cd (113 ± 105 μg/L), Pb (550 ± 237 μg/L), Ni (312 ± 97 μg/L) and Co (77 ± 56 μg/L). Fe is the most abundant chemical element. The analysis of groundwater and surface indicates that the levels of trace metals in these waters are higher than WHO standards except Zn.

关键词： Leachate Coastal Lagoon Groundwater Trace Metals Pollution

Monitoring the Physico-Chemical Quality of the Davo River (South-West of Côte d’Ivoire)

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Open Journal of Applied Sciences 2022年第8期12卷 1402-1415页

作者： Natchia Aka Yao Dakro Albert Gboko Kéiba Noël Keumean Oi Adjiri Adjiri Nagnin Soro Département Environnement Centre de Recherches Océanologiques Abidjan C&ocirc te d’Ivoire Laboratoire des Sciences et Techniques de l’Eau et l’Environnement (LSTEE) UFR-STRM Université Félix Houphou&euml t Boigny Abidjan C&ocirc te d’Ivoire Laboratoire des Sciences et Technologies de l’Environnement (LSTE) UFR Environnement-Université Jean Lorougnon Guédé Daloa C&ocirc te d’Ivoire

The Davo River, an affluent of the Sassandra River, like other rivers in Côte d’Ivoire, is subject to anthropogenic activities likely to deteriorate its quality which could affect its use as drinking water and also the health of aquatic organisms. This study aims at monitoring the temporal evolution of the physico-chemical quality of the waters of the Davo River at the Dakpadou hydrometric station. Twelve monthly field missions were carried out to sample water, measure temperature, pH, Electrical Conductivity and analyse turbidity, Suspended solids, major elements (Cl-, NO3-,HCO3-, SO42-, Mg2+, Ca2+, Na+, and K+) and Trace Metallic Elements (Hg, Fe, Cu, Cr, and Pb). Results show that the waters of the Davo river are poorly mineralized. They are also acidic during periods of low water and slightly basic during flooding periods. The average turbidity value of 10.18 NTU places these waters in the slightly turbid class. The waters have calcic bicarbonate facies during low water periods and sodium bicarbonate facies with low concentrations of major elements during flood months. The average TME concentrations of the Davo river indicate that the waters are not harmful for the health of the population and the aquatic environment.

关键词： Davo River Turbidity Suspended Solids Major Elements Trace Metallic Element

The role of marine protected areas in sustaining fisheries: The case of the National Park of Banc d’Arguin, Mauritania

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Aquaculture and Fisheries 2020年第5期5卷 253-264页

作者： Ewan Trégarot Beyah Meissa Didier Gascuel Ousmane Sarr Yeslem El Valy Oumar Hamet Wagne Elimane Abou Kane Abou Cire Bal Mohamed Saleck Haidallah Assane deda Fall Abdou Daïm Dia Pierre Failler centre for Blue Governance Portsmouth Business SchoolUniversity of PortsmouthPortsmouthUK Institut Mauritanien de recherches océanographiques et des Peches(IMROP) NouadhibouMauritania UMR Agrocampus Ouest InraEcologie et SantédesécosystemesUniversitéEuropéenne de BretagneRennesFrance Unitéde Recherche Macroéconomie Croissance et Développement(URMCD)Laboratoire EnvironnementSantéet Société(LE2S)Universitéde Nouakchott Al AasriyaNouakchottMauritania

Mauritania is characterized by fast-growing fisheries that have developed over the past several decades from low levels of fishing to intense fishing and have led to severe decreases in biomass and severe signs of over*** ensure sustainable fisheries,a primary goal of science-based fisheries policy is to provide an adequate conservation status of marine habitats that are directly,or indirectly,fundamental for the lifecycle of fish populations of commercial *** National Park of Banc d’Arguin has been recognized for its nursery and fish biomass export *** this paper,we present the economic value of the fish provisioning service of marine coastal ecosystems of the protected *** estimated the added value of artisanal fisheries,the spatial distribution of fishing activities,the contribution of the Park to the Mauritanian fisheries and the heritage value of artisanal ***,the average added value for artisanal fisheries is about 43 million MRU(1 million euros)over the period 2006–*** mainly benefits to the ship-owners,which generates inequalities and threatens the livelihoods of the *** spatial distribution of fishing activities and associated revenues shows high variability throughout the years,the seasons and the geographic areas,and reveals the high adaptability of Imraguen *** grounds are mostly located close to the shore,associated with seagrass beds,confirming the service of fish provisioning rendered by this ***,the high productivity of seagrass beds contributes to the spill-over of *** contribution of the Park to fishing activities that occur within the Mauritanian Exclusive Economic Zone is estimated to 15%,representing an added value creation of 3.2 billion MRU(71 million euros).The heritage value of the fisheries is assessed,through fishers’willingness to accept to stop their fishing activities,at 17.5 million MRU(0.4 million euros).Thus,this paper highlights the

关键词： Marine protected areas Fisheries Monetary evaluation Ecosystem services West Africa National Park of Banc d’Arguin

Study of the Spatio-Temporal Variability of Rainfall in the Northern Region of Senegal

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Journal of Geoscience and Environment Protection 2023年第4期11卷 1-14页

作者： Aichétou Dia Diop Abdoul Karim Mbodji El Hadji deme Malick Wade Mahamat Adoum Moussa Abdoulaye Bouya Diop Younousse Biaye Djiby Sarr Abdou Karim Farota Aboubakary Diakhaby Bouya Diop Laboratoire des Sciences de l’Atmosphère et des océans Matériaux Energies Dispositifs UGB Saint Louis Senegal Laboratoire D’études et de recherches en Statistiques et Développement University Gaston Berger (UGB) Saint Louis Senegal Ecole Nationale Supérieure des TIC N’Djamena Tchad

Senegal is a country of the Sahel. In this region, most of the populations live from agro-pastoral activities. The northern zone of Senegal is strongly influenced by river cultures. And the dynamics of the Senegal River are dependent on rainfall. The rainfall in the area is very closely linked to the dynamics of the atmosphere. The study of the spatio-temporal variability of rainfall in the northern region of Senegal requires quality rainfall observation data. It includes the Ferlo and the Senegal River valley, in particular the regions of Louga (department of Linguère included), Saint-Louis (departments of Dagana and Podor included) and Matam. These stations have been defined since Le Borgne (1988). The difficulty of having quality rain observation data can be resolved by using more accessible and good quality satellite data. Using satellite data, namely MSWEP, CRU, TAMSAT, ARC and PERSIANN, we showed the return of precipitation that appeared in 2000 and the unimodal cycle of precipitation in our study area. These data were validated using the correlation coefficient, the bias, the RMSE and the Nash index with observation data from the Regional Study Center for the Improvement of Adaptation to Drought (CERASS). The CRU data is then retained. Thus, this study made it possible to show the zonal distribution of rainfall in the northern zone of Senegal.

关键词： Rainfall in the Northern Region of Senegal Variability of Rainfall Satellite Data The Zonal Distribution of Rainfall

Trend and Return Level Analysis of Extreme Rainfalls in Senegal

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Journal of Water Resource and Protection 2022年第3期14卷 221-237页

作者： Mamadou Sarr Mahamat Adoum Moussa El Hadji deme Bouya Diop Laboratoire des Sciences de l’Atmosphère et des océans Matériaux-Energies-Dispositifs (LSAOMED) Université Gaston Berger Saint-Louis Sénégal Ecole Nationale Supérieur des TIC (ENASTIC) N’Djamena Tchad Laboratoire d’Etudes et de recherches en Statistique et Développement (LERSTAD) Université Gaston Berger Saint-Louis Sénégal

In recent years, Senegal has been confronted with increasingly frequent and damaging extreme events. In the context of climate change, we conducted this study to characterize the trends of rainfall extremes in Senegal. In this work, we used daily rainfall data from 27 stations in Senegal from the period 1951 to 2005 (55 years). To study their linear trends, non-stationary extreme value models with time as a covariate are fitted to evaluate them. Our results indicate a decreasing trend of extreme rainfalls at most of the stations except for 5 stations. However, the decreasing trends are only significant for two stations (Thiès and Kidira), however, this can only be taken as information that climate change may have already impacted extreme rainfalls. For the 20-year and 30-year return periods, the results show that they have undergone changes, in fact for almost all stations, the trends in return periods are decreasing.

关键词： Climate Change Extreme Rainfall Rain Trend Return Level Senegal

超深度脱硫纳米钼基硫化物催化剂的合成、反应及表征

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超深度脱硫纳米钼基硫化物催化剂的合成、反应及表征