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• W2964866837 abstract "With more than 6 million inhabitants, Abidjan district faces tremendous difficulties in water supply. The aquifer ofthe Continental Terminal which is actually the only drinking water source of the city shows a decline of resourcesand water demand is increasing due to the population growth. Moreover significant evidences of chemical andbiological pollution of the groundwater are observed The Aghien lagoon, the largest freshwater pool located nearAbidjan, has been identified by the State of Cote d’Ivoire as a potential resource for the production of drinkingwater.. The main objective of this project is to assess the quantitative and qualitative capacity of the Aghien lagoonto complement the water supply of Abidjan city in the near future.The main components of the project are:• to assess the water budget of the lagoon and its tributaries,• to characterize the spatial and temporal variability of contaminant levels and fluxes from the tributaries towardthe lagoon,• to assess the sustainability of the water resources (quantity and quality) of the lagoon according to land usechanges in the catchments .The project started in January 2015. The first year was devoted to the set-up of hydro-meteorological gaugeswithin the lagoon watershed. Three major tributaries of the lagoon are considered, the Me (4000 km2), the Djibi(78 km2) and Bete (206 km2) rivers. Since the start of the project, bi-monthly hydrochemical sampling surveyshave been carried out along the tributaries and in the lagoon. The data available from the surveys concern thephysico-chemical parameters, trace elements, all the forms of nitrogen and phosphorus, organic carbon, suspendedsolids.The Djibi and Bete watersheds are partly urbanized while the Me basin is mainly rural. Baseflow has beenidentified as the major contribution to streamflow at the annual scale. The Me flows into a channel downstream tothe Aghien lagoon but during the floods, water from the Me River can flow up the channel and supply the Aghienlagoon. Discharge measurements have shown that over a period of 8 months Bete and Djibi Rivers renewed halfof the total volume of the lagoon. The quantification of the Me contribution is in progress.In agreement with its high rate of urbanization, Djibi River is highly contaminated. High levels of ammonium andtotal phosphorus have been observed during both low and high flow conditions. Physico-chemical surveys haveshown also higher values of conductivity and lower values of dissolved oxygen in the Djibi River. Despite dilutioneffect due to the Me river inflow, the Aghien lagoon is already hypertrophic. The lagoon presents a high biologicalactivity characterized by high values of pH, phosphorus concentration but above all chlorophyll a.The research in the lagoon is going on to characterize the temporal variability and to quantify the impact of themajor flood events on the water quality of the lagoon and its tributaries, urbanized or rural." @default.
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• W2964866837 date "2016-04-23" @default.
• W2964866837 modified "2023-10-17" @default.
• W2964866837 title "Aghien lagoon: a sustainable resource of fresh water for the city of Abidjan (Ivory Coast)? Description of the project and preliminary results" @default.
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