Regional-scale interactions between groundwater and surface water under changing aridity: evidence from the River Awash Basin, Ethiopia

Regional-scale interactions between groundwater and surface water under changing aridity: evidence from the River Awash Basin, Ethiopia
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干旱变化下地下水和地表水之间的区域尺度相互作用:来自埃塞俄比亚阿瓦什河盆地的证据

DOI:
10.1080/02626667.2021.1874613
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发表时间:
2021
影响因子:
3.5
通讯作者:
Kebede S
Kebede S
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Kebede S

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流域尺度的地表沃茨和地下沃茨之间的关系很少调查,但对水资源开发和管理具有重要意义。在这里,我们整合了来自地球化学示踪剂和测压的证据,以促进对埃塞俄比亚阿瓦什河流域区域尺度地下水-地表水相互作用的理解。水文特征与在其他半干旱和干旱流域观察到的特征一致,在这些流域,河流主要是流失,并作为补给源,而不是作为地下水排放的汇。此外,源自高地的区域地下水流流出集水区,而不是排入河流。因此,从低地几个区域范围的含水层抽取地下水预计不会影响河流流量。然而,盐碱化对灌溉和供水构成了重大威胁。我们确定了对整个流域的水安全具有重大影响的流入、用水、湿地和水质管理的关键领域。
Relationships between surface waters and groundwaters at basin scale are rarely investigated but have important implications for water resource development and management. Here, we integrate evidence from geochemical tracers and piezometry to advance the understanding of regional-scale, groundwater–surface water interactions in the River Awash Basin of Ethiopia. Hydrological characteristics are consistent with those observed in other semi-arid and arid basins where rivers are predominantly losing and act as a source of recharge rather than as a sink for groundwater discharge. Further, regional groundwater flow originating from the highlands exits the catchment rather than discharging to the riverine drainage. Consequently, groundwater abstraction from several regional-scale aquifers in the lowlands is not expected to impact river flow. However, salinity presents a major threat to irrigation and water supply. We identify critical areas for managing inflows, water use, wetlands and water quality that have significant implications for water security across the basin.
模拟灌溉水流-含水层系统中的流量和化学质量变化
DOI: --
发表时间: 1974
期刊:
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湖泊不断扩大,问题也越来越多:埃塞俄比亚贝塞卡湖综合水文地质调查
DOI: --
发表时间: 2009
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