以塌陷范围为约束的岩溶水水源地安全开采量评价

Evaluation of Safety Exploitation Quantity of Karst Water Constrained by Collapse Range

根据岩溶水安全开采量概念,给出了岩溶水安全开采量的评价流程,并以湖南省郴州市北湖岩溶地下水水源地为例,构建了岩溶塌陷临界水位降深数学模型,计算了岩溶塌陷产生的临界水位降幅,以此降幅为岩溶塌陷允许边界处的动水位降深反求开采井的动水位降深,进而计算开采井的开采量,再应用地下水动态长期观测和降水资料所得的变换系数换算为岩溶水安全开采量,与水源地开采历史数据进行对比分析,确定了北湖岩溶水水源地的安全开采量。实例验证该评价方法简易明了、行之有效、合理实用。

According to karst water safety production concept, a evaluation process of karst water safety production is given. Taking the North Lake karst groundwater source area in the Chenzhou city of Hunan Province for an example, the mathematical model of karst collapse critical drawdown is established to compute the critical drawdown of karst collapse. And then the dynamic water level drawdown of drilling well is calculated by considering dynamic water level drawdown at allowed border of karst collapse. At the same time, the mining production of well is calculated. Finally, the safety pro- duction of North Lake karst groundwater source area is determined by comparing historical data of water exploiting at water source area with karst water safety production calculated from conversion coefficient of long term groundwater dynamic observation data. The example case demonstrates that the evaluation method is simple and clear, reasonable, effective and practical.