Anomalous behavior of soil mantle groundwater demonstrates the major effects of bedrock groundwater on surface hydrological processes
Anomalous behavior of soil mantle groundwater demonstrates the major effects of bedrock groundwater on surface hydrological processes
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DOI：
10.1029/2006wr005859
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发表时间：
2008-01
影响因子：
5.4
通讯作者：
K. Kosugi;S. Katsura;T. Mizuyama;Suemi Okunaka;T. Mizutani
中科院分区：
文献类型：
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作者：
K. Kosugi;S. Katsura;T. Mizuyama;Suemi Okunaka;T. Mizutani
地下水在土壤表层的形成对水源地雨水排泄和浅层滑坡的发生起着主导作用。在这里，我们报告两个完全不同的地下水反应在一个单一的井挖入土壤地幔。一种是基于地理信息系统（GIS）的物理水文模型很好地描述的短暂型响应。另一种是半常年型反应，在以前的研究中很少报告，现有的物理模型无法解释。半常年地下水在风暴之间造成相当高的前期地下水位，导致后期强风暴事件期间地下水位峰值增加，并可能增加浅层滑坡的风险。此外，半常年地下水的峰值大大滞后于暴雨事件，这可能通过形成延迟的峰值而影响基流排放。地球化学和地热观测表明，半常年地下水的来源是深层基岩地下水，这表明基岩地下水对地表水文过程有相当大的影响。
The formation of groundwater in the soil mantle has a dominant effect on rainwater discharge and shallow landslide occurrence in headwater catchments. Here, we report two completely different groundwater responses within a single well excavated into the soil mantle. One was an ephemeral‐type response that is well described by physical hydrology models based on a geographic information system (GIS). The other was a semi‐perennial‐type response, rarely reported in previous studies, which cannot be explained by the existing physical models. The semi‐perennial groundwater caused considerably high antecedent groundwater tables between storms, leading to an increased peak in the groundwater level during later heavy storm events and a likely increase in the risk of shallow landslides. Moreover, peaks in the semi‐perennial groundwater lagged considerably behind rainstorm events, which probably affected base flow discharge by forming a delayed peak. Geochemical and geothermal observations indicated that the source of the semi‐perennial groundwater was deep bedrock groundwater, demonstrating the considerable effects of bedrock groundwater on surface hydrological processes.