Multi-tracer assessment of seasonal water source changes in coastal water systems along the southeastern coast of Ivory Coast (West Africa)

Proper management of coastal freshwater resources depends on an understanding of processes controlling their chemistry and seasonal flowpaths. A quantitative approach involving the coupling of major solutes and isotopes (δ 18 O, δ 2 H) of 180 samples in end-member mixing analysis (EMMA) was adopted...

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Bibliographic Details
Published in:Hydrological sciences journal 2018-12, Vol.63 (15-16), p.2124-2145
Main Authors: Osemwegie, Isimemen, Stumpp, Christine, Biemi, Jean, Reichert, Barbara
Format: Article
Language:English
Subjects:
Aquifer recharge
Aquifers
Catchment area
Chemical analysis
Coastal lagoons
Coastal management
Coastal waters
Coastal zone management
Coasts
Dry season
end-member mixing analysis
Evaporation
Floodplains
Freshwater
Freshwater resources
Geology
Groundwater recharge
Hydrology
Inflow
Inland water environment
Isotopes
Ivory Coast
Lagoons
Organic chemistry
Pliocene
Precipitation
Quaternary
Rainy season
Resource management
River discharge
River flow
Rivers
Salinization
Seasons
Seawater
Seepages
Solutes
Tracers
Water analysis
Water discharge
Water inflow
Wet season
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Summary:Proper management of coastal freshwater resources depends on an understanding of processes controlling their chemistry and seasonal flowpaths. A quantitative approach involving the coupling of major solutes and isotopes (δ 18 O, δ 2 H) of 180 samples in end-member mixing analysis (EMMA) was adopted to elucidate seasonal patterns of hydraulic exchanges amongst coastal waters along the Ebrié Lagoon catchment, Ivory Coast. The results show that the Ebrié Lagoon is a hydrologically dynamic system. In the dry season, evaporation and seawater inflow are the dominating processes, while in the wet season, river discharge is the main water source in the lagoon. Regional geology plays a significant role in aquifer recharge patterns. The Quaternary aquifer responds faster to precipitation, while the Mio-Pliocene aquifer is recharged indirectly via floodplain seepages. Salinization of over 90% of wells arises from hydrological exchanges with the Ebrié Lagoon. A diluted seawater effect was recorded in wells during the wet season owing to the relative increase in freshwater inflow.
ISSN:0262-6667
2150-3435
DOI:10.1080/02626667.2018.1558366