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《地下水科學與工程(英文版)》 2015-02
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Specific yield of phreatic variation zone in karst aquifer with the method of water level analysis

GONG Xiao-ping;JIANG Guang-hui;CHEN Chang-jie;GUO Xiao-jiao;ZHANG Hua-sheng;Key laboratory of Karst dynamics,CAGS/Laboratory of Karst Dynamics, MLR & GZAR/International Karst Research Centre under the Auspices of UNESCO;China University of Geosciences;School of Geographical Science, Southwest University;  
Regime of groundwater level is a comprehensive reflection of the hydrogeological environment from the perspective of groundwater. Based on the analysis of the water-level change of 65 groundwater monitoring points from 1987 to 1990, it is found that intermittent cones of depression came into being due to groundwater exploitation in Guilin during the observation period. The buried depth of groundwater in the drawdown cones, the annual variation of water level and specific yield have higher values. Improvement has been made to the formula of infiltration coefficient of precipitation. By using the precipitation response data recorded at every 15 minutes for water level of No. 9 borehole which is near Zengpiyan Cave, the specific yield of phreatic variation zone is indirectly calculated by using the modified formula. The results are range from 0.012 to 0.462 and the spatial distribution of specific yield is ascertained. These make up the deficiency that empirical values cannot be categorized based on the actual conditions. What's more, the widely used Aviriyanover's empirical formula is poorly applicable to karst area. This is due to its strict requirement for outside conditions, such as shallow buried depth, homogeneous aquifer medium and small hydraulic gradient.
【Fund】: supported by National Natural Science Foundation of China(No.41172231)
【CateGory Index】: P641.7
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