广西大新县岩溶地下水供水水源地调查评价

Karst area groundwater source area survey and evaluation for Daxin County of Guangxi

采用地面调查、物探、钻探及水文地质试验等联合方法,调查了广西大新县供水水源地地下水资源的可利用性,调查得出该区岩溶发育,岩溶地下水以地下暗河及岩溶泉形式为主,地下水丰富,开发潜力大。并评价了大新道班及北山村水源地的水文地质参数及地下水开采能力,建议分别以溢洪天窗作为抽水点和分散布井方式开发利用岩溶地下水,为了不引起岩溶塌陷及降低成本,建议开采降深为5 m左右。

Groundwater resources survey in the water source areas of Daxin County was conducted by multiple methods including surface investigation,geophysical prospecting, drilling and hydro-geological tests,rendering the conclusion that underground rivers and springs contribute rich groundwater resources in this area where karst is developed.For the two water source areas of Daxindaoban and Beishan village,hydro-geological parameters and groundwater exploitation capacity were evaluated.It is suggested to pump groundwater from spillway karst windows or scattered wells.The proposed exploitation drawdown is about 5m in order to prevent karst collapse and reduce costs.