Article (Scientific journals)
Factors controlling the evolution of groundwater dynamics and chemistry in the Senegal River Delta
Gning, Abdoul Aziz; Orban, Philippe; Gesels, Julie et al.
2017In Journal of Hydrology: Regional Studies, 10, p. 133-144
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Keywords :
Senegal River Delta; Groundwater - surface water interaction; Hydrogeochemistry; Saline water; Irrigation; Soil salinization
Abstract :
[en] tStudy region: Senegal River Delta. Study focus: The Senegal River Delta is a strategic region for the development of irri-gated agriculture. Despite a Sahelian climatic context, the management of the river withdams ensures water availability throughout the year. With the intensification of agri-culture, degradation of cultivated soils is observed, mostly linked to the existence of ashallow salty aquifer. In this context, regional surveys were performed to characterizegroundwater–surface water interactions and to identify the impact of artificial river man-agement and agricultural intensification on the evolution of groundwater dynamics andchemistry.New hydrological insights for the region: Results show that groundwater far away from riversand outside irrigated plots has evolved from marine water to brines under the influenceof evapotranspiration. Near rivers, salinity of groundwater is lower than seawater andgroundwater mineralization seems to evolve in the direction of softening through cationicexchanges related to permanent contact with fresh water. Despite large volumes of waterused for rice cultivation, groundwater does not show any real softening trend in the culti-vated parcels. Results show that the mechanisms that contribute to repel salt water fromthe sediments correspond to a lateral flush near permanent surface water streams and notto vertical drainage and dilution with rainfall or irrigation water. It is however difficultto estimate the time required to come back to more favorable conditions of groundwatersalinity.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Earth sciences & physical geography
Geological, petroleum & mining engineering
Author, co-author :
Gning, Abdoul Aziz;  Université de Liège > Département ArGEnCo > Hydrogéologie et Géologie de l'environnement
Orban, Philippe  ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Gesels, Julie ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Ngom, Fatou Diop;  Université Cheikh Anta Diop > Département de Géologie > Laboratoire d'Hydrogéologie
Dassargues, Alain  ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Malou, Raymond;  Université Cheikh Anta Diop > Département de Géologie > Laboratoire d'Hydrogéologie
Brouyère, Serge  ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Factors controlling the evolution of groundwater dynamics and chemistry in the Senegal River Delta
Publication date :
March 2017
Journal title :
Journal of Hydrology: Regional Studies
eISSN :
2214-5818
Publisher :
Elsevier Science
Volume :
10
Pages :
133-144
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
WBI - Wallonie-Bruxelles International [BE]
Available on ORBi :
since 29 March 2017

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