干旱区生态环境知识资源中心(Arid): Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa

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DOI	10.1007/s10040-019-01957-6
	Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa
	Ebrahim, Girma Y.1; Villholth, Karen G.1; Boulos, Maurice 1,2
通讯作者	Ebrahim, Girma Y.
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2019
卷号	27 期号:3 页码:965-981
英文摘要	An integrated hydrogeological modelling approach applicable to hard-rock aquifers in semi-arid data-scarce Africa was developed using remote sensing, rainfall-runoff modelling, and a three-dimensional (3D) dynamic model. The integrated modelling approach was applied to the Hout catchment, Limpopo Province, South Africa, an important agricultural region where groundwater abstraction for irrigation doubled during 1968-1986. Since the 1960s, groundwater levels in irrigated areas have displayed extended periods of decline with partial or full recovery in response to major decadal rainfall events or periods. The integrated dynamic 3D hydrogeological flow model, based on the One-Water Hydrologic Flow Model (MODFLOW-OWHM), helped to understand recharge and flow processes and inform water use and management. Irrigation abstraction was estimated based on irrigated crop area delineated using the Landsat Normalized Difference Vegetation Index (NDVI) and crop water requirements. Using groundwater level data, the model was calibrated (2008-2012) and validated (2013-2015). Estimated mean diffuse recharge (3.32.5% of annual rainfall) compared well with estimates from the Precipitation Runoff Modelling System model. Recharge and groundwater storage showed significant inter-annual variability. The ephemeral river was found to be losing, with mean net flux to the aquifer (focused recharge) of similar to 1.1% of annual rainfall. The results indicate a delicate human-natural system reliant on the small but highly variable recharge, propagating through variable pumping to an even more variable storage, making the combined system vulnerable to climate and anthropogenic changes. The integrated modelling is fundamental for understanding spatio-temporal variability in key parameters required for managing the groundwater resource sustainably.
英文关键词	Groundwater recharge Hard rock aquifers Integrated hydrogeological modelling South Africa Sub-Saharan Africa
类型	Article
语种	英语
国家	South Africa ; Switzerland
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000467483100010
WOS关键词	SYSTEME HYDROLOGIQUE EUROPEEN ; NORTH CHINA PLAIN ; CLIMATE-CHANGE ; FLOW ; AQUIFERS ; OPPORTUNITIES ; CALIBRATION ; MODFLOW ; SURFACE ; SHE
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/2XILL650/216176
作者单位	1.Int Water Management Inst, 141 Creswell Rd,Weavind Pk, Pretoria, South Africa; 2.Swiss Fed Inst Technol Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Ebrahim, Girma Y.,Villholth, Karen G.,Boulos, Maurice. Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa[J],2019,27(3):965-981.
APA	Ebrahim, Girma Y.,Villholth, Karen G.,&Boulos, Maurice.(2019).Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa.HYDROGEOLOGY JOURNAL,27(3),965-981.
MLA	Ebrahim, Girma Y.,et al."Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa".HYDROGEOLOGY JOURNAL 27.3(2019):965-981.