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Volume 35 Issue 6
Dec.  2016
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Article Navigation >  CARSOLOGICA SINICA  > 2016  >  35(6): 629-638
GUO Xiaojiao, GONG Xiaoping, TANG Qingjia, CHEN Changjie, JIANG Guanghui, LI Xin, ZOU Yane. The response processes of moisture at soil profile to precipitation in typical karst hillslopes[J]. CARSOLOGICA SINICA, 2016, 35(6): 629-638. doi: 10.11932/karst20160604
Citation: GUO Xiaojiao, GONG Xiaoping, TANG Qingjia, CHEN Changjie, JIANG Guanghui, LI Xin, ZOU Yane. The response processes of moisture at soil profile to precipitation in typical karst hillslopes[J]. CARSOLOGICA SINICA, 2016, 35(6): 629-638. doi: 10.11932/karst20160604
shu

The response processes of moisture at soil profile to precipitation in typical karst hillslopes

doi: 10.11932/karst20160604
  • 1.

    Institute of Karst Geology, CAGS/Ministry of Land Resources and Guangxi Key Laboratory of Karst Dynamics

  • 2.

    Institute of Karst Geology, CAGS/Ministry of Land Resources and Guangxi Key Laboratory of Karst Dynamics；Water Engineering Geological Party of Guangxi

  • 3.

    Institute of Karst Geology, CAGS/Ministry of Land Resources and Guangxi Key Laboratory of Karst Dynamics；China University of Geoscience

  • Publish Date: 2016-12-25
    Abstract
  • To reveal the response processes of the moisture at soil profile to precipitation events, high-resolution monitoring has been conducted to estimate the dynamic change and the factors that affect the soil profile moisture. The purpose of this study was to identify the rainfall infiltration mechanisms in karst hillslope areas. The results indicate that the response of soil profile moisture to precipitation is influenced by previous soil moisture, rainfall amount, rainfall intensity and topographic condition. The resident time of the first soil moisture response is related to previous soil moisture content, which ranges from 0.5-4.75 h, characterized by significant seasonal differences. A threshold rainfall amount exists for producing an increase of soil moisture. The 6 mm threshold is required to activate soil moisture response in dry seasons. The response time is almost synchronous, approximately 0.25 h, when the soil moisture deficit is overcome. These results illustrate that the deeper soil moisture is probably recharged by preferential flow or lateral flow. The magnitude of soil moisture variation decreases with the increase of soil depth, which is related to the climate condition, evaporation and medium permeability differences controlled by communicating with the interfaces of soil-atmosphere, soil-vegetation, and soil-bedrock.

     

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