Role of Groundwater in Sustaining Northern Himalayan Rivers
Role of Groundwater in Sustaining Northern Himalayan Rivers
复制标题
地下水在维持喜马拉雅北部河流中的作用
DOI：
10.1029/2020gl092354
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发表时间：
2021
影响因子：
5.2
通讯作者：
Li Guoshuai
中科院分区：
文献类型：
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作者：
Yao Yingying;Zheng Chunmiao;Andrews Charles B.;Scanlon Bridget R.;Kuang Xingxing;Zeng Zhenzhong;Jeong Su-jong;Lancia Michele;Wu Yiping;Li Guoshuai
喜马拉雅山脉对于生活在下游的120亿人的供水至关重要，而可用的水对气候变化高度敏感。地下水系统在维持北方喜马拉雅河流中的作用仍然未知，这将危及亚洲未来水资源的可持续性。在这里，我们量化的时空贡献的雅鲁藏布江流域（雅鲁藏布江上游）的地下水河流流量。结果表明，地下水补给量占年平均降水量的1.23%，相当于基流的1.30 km 3/yr，占上游河流总流量的1.55%，下游河流总流量的1.27%。地下水贡献的百分比与地形坡度和总降水量呈负相关，喜马拉雅山东部地形最陡，降水量最高。这项研究填补了喜马拉雅山地下水的知识空白，是预测气候变暖下水资源变化的基础。
The Himalayas are critical for supplying water for ∼2 billion people who live downstream, and available water is highly sensitive to climate change. The role of the groundwater system in sustaining the northern Himalayan rivers remains unknown, and this compromises Asia's future water sustainability. Here, we quantify the spatiotemporal contribution of groundwater to river flows in the Yarlung Zangbo Basin (upper reaches of Brahmaputra). Our results show that the groundwater recharge represents ∼23% of mean annual precipitation, translating into ∼30 km3/yr of baseflow, which contributes ∼55% of the total river discharge in the upstream reaches to ∼27% in the downstream reaches. The percentage of groundwater contribution is inversely related to topographic steepness and total precipitation, with the steepest topography and highest precipitation in the eastern Himalayas. This study fills a knowledge gap on groundwater in the Himalayas and is a foundation for projecting water changes under climatic warming.