Alluvial aquifer characterisation and resource assessment of the Molototsi sand river, Limpopo, South Africa
Alluvial aquifer characterisation and resource assessment of the Molototsi sand river, Limpopo, South Africa
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南非林波波省莫洛托西沙河冲积含水层特征和资源评估
DOI:
10.1016/j.ejrh.2018.09.002
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发表时间:
2018
期刊:
影响因子:
4.6
通讯作者:
Walker D
中科院分区:
文献类型:
--
作者:
Walker D
Study regionMolototsi sand river, Limpopo, South Africa.Study focusEphemeral sand rivers are common throughout the world’s dryland regions, often providing a water source where more conventional sources are unavailable. However, these alluvial aquifers are poorly represented in the literature. Extensive field investigations allowed estimation of stored water volume and characterisation of an alluvial aquifer.New hydrological insights for the regionComputed alluvial aquifer properties included hydraulic conductivity of 20–300 m/d, porosity of 38–40%, and aquifer thickness of 0–6 m. Dykes and other subcrops commonly compartmentalise the aquifer though do not form barriers to flow. A hydraulic disconnect between deep groundwater (occurring in fractured metamorphic rocks) and the alluvial aquifer was revealed by groundwater levels and contrasting hydrochemistry and stable isotope signatures. The dominant recharge process of the alluvial aquifer is surface runoff occurring from torrential tributaries in the catchment’s upper reaches. A fraction of available storage is currently abstracted and there exists potential for greater exploitation for smallholder irrigation and other uses.
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