干旱区生态环境知识资源中心(Arid): Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso

Arid

DOI	10.1007/s10040-022-02506-4
	Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso
	Rusagara, Radegonde; Koita, Mahamadou; Plagnes, Valerie; Jost, Anne
通讯作者	Rusagara, R
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2022
卷号	30 期号:5 页码:1489-1512
英文摘要	Groundwater recharge rate for weathered rock aquifers in the Sahel of West Africa is sparse due to insufficient knowledge of the recharge pathways. This study was initiated in the Tougou ephemeral river catchment (37 km(2)) to improve understanding of recharge pathways to a weathered rock aquifer in the dryland of Burkina Faso. It is based on field investigations conducted in 2016-2020 on a piezometric transect and large-diameter wells, perpendicular and longitudinal to the river, respectively. Geophysical measurements, lithologs analysis, permeability tests, groundwater and river level monitoring, and rainfall measurements were undertaken. The results showed a laterally continuous saprolite aquifer (10-22 m thick) overlain by residual soils beneath the river and discontinuous laterite on the banks. Below the river, the saprolite overlays the weathered schist aquifer with an upward or downward hydraulic gradient regardless of the seasons. The saprolite is replenished by focused recharge from the river and diffuse recharge from the rainfall on the banks, according to information from the groundwater hydrographs, groundwater tracing results, and cross-correlation between the groundwater levels and the two potential recharge sources (rainfall and river water). The low hydraulic conductivity, electrical resistivity tomography profiles and lithologs indicate restriction of diffuse and focused recharge through soil matrix infiltration, suggesting there are preferential recharge pathways. For the 2018-2020 period, the water-table fluctuation method provides recharge estimates of 14-51 mm/year on the northern bank, 10-36 mm/year on the southern bank and 148-194 mm/year in the riverbed.
英文关键词	Arid regions Weathered rock Groundwater recharge Losing ephemeral river Burkina Faso
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000814956400001
WOS关键词	LAND-USE CHANGE ; WATER-TABLE ; HYDRAULIC CONDUCTIVITY ; CRYSTALLINE BASEMENT ; TRANSMISSION LOSSES ; SHALLOW GROUNDWATER ; RUNOFF ; SAHEL ; RAINFALL ; CLIMATE
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393038
推荐引用方式 GB/T 7714	Rusagara, Radegonde,Koita, Mahamadou,Plagnes, Valerie,et al. Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso[J],2022,30(5):1489-1512.
APA	Rusagara, Radegonde,Koita, Mahamadou,Plagnes, Valerie,&Jost, Anne.(2022).Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso.HYDROGEOLOGY JOURNAL,30(5),1489-1512.
MLA	Rusagara, Radegonde,et al."Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso".HYDROGEOLOGY JOURNAL 30.5(2022):1489-1512.