ZHANG Zhi-cai1, CHEN Xi1, CHENG Qin-bo1, PENG Tao2, ZHANG Yan-fang1, JI Zhong-hua2,1
(1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering，Hohai University, Nanjing 210098, China;
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)
Abstract: As an important storage and transporation space, epikarst is a main factor affecting the water cycle in a karst area, and the hydrogeological study of epikarst is crucial to hydrologic research and environmental assessment in this area. The study is conducted in a small watershed of Chenqi at Puding,Guizhou Province. Based on the results of field investigation, Ground Penetrating Radar (GPR) and infiltration test, the hydrogeology of epikarst and the effect on hydrology have been studied. The mean fracture rate of epikarst is 5.3%，and it decreases with increasing depth. The depth of epikarst with about 10~60cm-thick soil layer above is around 3m in the cluster-peach of this basin, and shows a decreasing tendencye from lower level to higher level. There is a difference between epikarst and other conjoint layers, and it is the important reason of overland flow in the karst area.
Key words: epikarst; hydrogeology; fracture rate; hydrologic conductivity; GPR.
EARTH AND ENVIRONMENT Vol. 39, No.1, Tot No.283, 2011, Page 19-25
