| 典型岩溶包气带洞穴滴水水文过程研究—以桂林硝盐洞为例 |
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| 关键词:Xiaoyan Cave vadose zone epikarst aquifer hydrological process precipitation threshold residence time |
| 基金项目:国家自然科学基金项目(编号: 41172231; 41502176; 41302211)、中国地质调查局地质调查项目(编号: DD20160285)和广西院士顾问项目(编号: 2002371310009)联合资助 |
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| Research on Hydrological Processes of Cave Dripping Water in a Typical Karst Vadose Zone: A Case Study of Xiaoyan Cave, Guilin |
| The high resolution monitoring of hydrochemistry and tracing test were conducted to determine recharge sources and study hydrological response processes of cave dripping water to precipitation in Xiaoyan Cave. The results indicate that the dripping water of Xiaoyan Cave is mainly recharged by two different flow components, i.e., conduit flow characterized by concentrated recharge and diffuse flow. The epikarst aquifer probably exists in the upper vadose zone of Xiaoyan Cave, which continuously maintains the drip flow. The peak of drip flow, electrical conductivity and tracer concentration all show a rapid response with conduit flow during the intensive precipitation events, and there is a threshold arousing the dripping water response to the precipitation in Xiaoyan Cave. The pre-even karst aquifer hydrological conditions are main factors that cause hydrological response differences of karst vadose zones. Two response modes of dripwater to infiltration event was identified as the retention function of soil and epikarst, with the result of a 10-hour rapid response in wet season and a 9.8-day lagged-time response in dry season. 74.4 mm rainfall is the threshold for precipitation response from dry to rainy season. The integration of cave dripwater hydrodynamic variation and tracer test technology proves to have a significant influence on studying hydrological processes in vadose zone, acquiring the structure and characteristics of karst aquifer and revealing the mechanism of precipitation infiltration recharge in karst area. |
| GUO Xiao-jiao,GONG Xiao-ping,YUAN Dao-xian,YIN Jian-jun,JIANG Guang-hui,LIN Yu-shi,BAI Bing,TANG Qing-jia,CHEN Chang-jie.2017.Research on Hydrological Processes of Cave Dripping Water in a Typical Karst Vadose Zone: A Case Study of Xiaoyan Cave, Guilin[J].Acta Geoscientica Sinica,38(4):537-548. |
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