Numerical Approaches for Estimating Daily River Leakage from Arid Ephemeral Streams
Numerical Approaches for Estimating Daily River Leakage from Arid Ephemeral Streams
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估算干旱短暂河流每日河流渗漏的数值方法
DOI：
10.3390/w12020499
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发表时间：
2020-02
期刊：
影响因子：
--
通讯作者：
Yu Jingjie
中科院分区：
文献类型：
--
作者：
Min Leilei;Vasilevskiy Peter Yu.;Wang Ping;Pozdniakov Sergey P.;Yu Jingjie
尽管河流渗漏对干旱/半干旱地区的河岸生态系统具有重要意义，但对这些地区短暂河流渗漏过程的真正理解和准确量化仍然难以捉摸。在这项研究中，河流入渗的模式和相关的控制因素，在约150公里的东河（黑河下游，中国）的一部分，揭示了使用相结合的实地调查和建模技术。结果表明，2010年4月21日至2012年9月7日，模拟河段渗漏水量占总径流量的33%。敏感性分析表明，模拟入渗速率对含水层导水率和最大蒸散率最为敏感。然而，河流渗漏率，即，一次径流事件的渗漏量占总径流量的比例很大程度上取决于总径流量和河流流量。除了河床的水力参数外，蒸散参数的特征对于定量干旱短流与下伏含水层之间的通量交换同样重要。耦合的地表水/地下水模型，其目的是估计河流渗漏，应考虑河岸带，因为这些地区发挥了主导作用，从河流通过ET补给渗漏的形成。研究结果可为干旱区调控流域水资源规划和管理提供参考，以维护河岸带生态系统。
Despite the significance of river leakage to riparian ecosystems in arid/semi-arid regions, a true understanding and the accurate quantification of the leakage processes of ephemeral rivers in these regions remain elusive. In this study, the patterns of river infiltration and the associated controlling factors in an approximately 150-km section of the Donghe River (lower Heihe River, China) were revealed using a combination of field investigations and modelling techniques. The results showed that from 21 April 2010 to 7 September 2012, river water leakage accounted for 33% of the total river runoff in the simulated segments. A sensitivity analysis showed that the simulated infiltration rates were most sensitive to the aquifer hydraulic conductivity and the maximum evapotranspiration (ET) rate. However, the river leakage rate, i.e., the ratio of the leakage volume to the total runoff volume, of a single runoff event relies heavily on the total runoff volume and river flow rate. In addition to the hydraulic parameters of riverbeds, the characteristics of ET parameters are equally important for quantifying the flux exchange between arid ephemeral streams and underlying aquifers. Coupled surface/groundwater models, which aim to estimate river leakage, should consider riparian zones because these areas play a dominant role in the formation of leakage from the river for recharging via ET. The results of this paper can be used as a reference for water resource planning and management in regulated river basins to help maintain riparian ecosystems in arid regions.
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