Groundwater recharge in hillslopes on the Chinese Loess Plateau
Groundwater recharge in hillslopes on the Chinese Loess Plateau
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中国黄土高原山坡地下水补给
DOI：
10.1016/j.ejrh.2021.100840
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发表时间：
2021-08
期刊：
影响因子：
--
通讯作者：
Si Bingcheng
中科院分区：
文献类型：
--
作者：
Tao Ze;Li Hongchen;Neil Eric;Si Bingcheng
研究区：黄土高原青涧沅泽沟流域、长武王东沟流域。研究重点：山坡是地球上主要的陆地形式单元，尽管在世界上许多地方它对维持地下水供应很重要，但人们对山坡上的地下水补给知之甚少。我们认为，地下水在坡地深层非饱和带的补给主要是由土壤基质流动促成的，而且坡地的补给速率远小于平坦景观。为了验证这一假设，从不同土地利用地区收集了7个15-20 m长的岩心，以确定位于中国黄土高原半湿润半干旱流域的山坡深层不饱和带的地下水补给率及其控制因素。氚在各土壤剖面中的分布呈明确的钟形，表明土壤基质位移是主要的补给机制。氚峰位于半干旱流域的9.33 m ~ 11.01 m深度和半湿润流域的6.29 m ~ 7.22 m深度之间，补给速率为24.5 ~ 33.8 mm yr−1。这些补给量占长期降水的4% - 7%，约占平坦地区补给量的56%。地下水补给主要受土壤质地和土地利用变化的控制，受气候差异的影响不大。
Study regionYuanzegou Watershed in Qingjian, Wangdonggou watershed in Changwu, the Chinese Loess Plateau.Study focusHillslopes are the predominant land form unit on Earth, and despite its importance in maintaining groundwater supplies in many parts of the world, groundwater recharge on hillslopes is poorly understood. We hypothesize that groundwater recharge in the deep unsaturated zones of hillslopes is facilitated mainly by soil matrix flow, and the recharge rates are much smaller in hillslopes than on flat landscapes. To test the hypothesis, seven 15–20 m-long cores were collected from areas of different land uses to determine the groundwater recharge rates and its controls in deep unsaturated zones of hillslopes at a sub-humid and a semi-arid watershed located on the Chinese Loess Plateau.New hydrologic insights for the regionThe tritium distribution in each soil profile exhibits a well-defined bell-shape, signifying that soil matrix displacement is the main recharge mechanism. The tritium peak was located between depths of 9.33 m–11.01 m at the semiarid watershed and 6.29 m–7.22 m at the sub-humid watershed, and the recharge rates varied from 24.5 to 33.8 mm yr−1. These recharge rates account for 4 %–7 % of the long-term precipitation, which is approximately 56 % of the recharge typically seen on flat landscapes. Groundwater recharges were mainly controlled by soil texture, and land use changes, but exhibited little impact from the climatic difference between the two watersheds.
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影响因子：
6.2
作者：
Brito, Patricia;Roberto Lorenzo, J.;Jimenez, Maria S.
通讯作者：
Jimenez, Maria S.
影响因子：
6.4
作者：
R. Lin;K. Wei
通讯作者：
R. Lin;K. Wei
土壤溶质剖面可以揭示多少有关地下水补给的信息？
影响因子：
1.2
作者：
Huang, Tianming;Yang, Shuo;Liu, Jilai;Li, Zhi
通讯作者：
Li, Zhi
影响因子：
6.3
作者：
H. Guan;A. Love;C. Simmons;J. Hutson;Z. Ding
通讯作者：
H. Guan;A. Love;C. Simmons;J. Hutson;Z. Ding
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影响因子：
9.8
作者：
Zhang Xuexian;Song Jinxi;Wang Yirui;Deng Wenjia;Liu Yifan
通讯作者：
Liu Yifan