An Analysis of Allowable Groundwater Drawdown and Pumpage from a Karst Aquifer to Prevent Sinkhole Collapses in the Pearl River Delta, China,Water Resources

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An Analysis of Allowable Groundwater Drawdown and Pumpage from a Karst Aquifer to Prevent Sinkhole Collapses in the Pearl River Delta, China
Water Resources ( IF 1 ) Pub Date : 2020-07-30 , DOI: 10.1134/s0097807820040089
Yan Meng , Zhuojun Li , Long Jia

Abstract

In China’s Pearl River Delta, numerous sinkholes caused by excessive groundwater pumping from a karst aquifer have opened. These sinkholes can cause wells and springs to dry up, dwellings to be damaged, and can facilitate the entry of pollutants into the aquifer. Controlling drawdown and pumpage to prevent sinkhole collapse is important for the aquifer’s protection and sustainability. This paper uses two approaches to obtain the critical drawdown and pumpage values to prevent sinkholes from opening: a field pumping experiment and hydraulic gradient tests. The results show that: (1) to prevent sinkhole collapse, the pumpage must be less than the allowable value determined by the seepage deformation method. (2) Water level decline is an important parameter that has to be considered to prevent sinkhole collapses. (3) Adjusting the intensity and mode of aquifer exploitation can increase allowable groundwater pumpage while preventing sinkhole development.

更新日期：2020-07-30

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