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碳酸盐岩区大型水库蓄水引起的地下水渗流场及岩溶环境变化的研究,既是一个工程实际问题,同时也是岩溶环境学的理论问题.以高坝洲和隔河岩水库为例,运用数值模拟方法模拟了水库蓄水前后地下水渗流场的平面和剖面流网特征以及地下水渗透流速的空间变化规律.在此基础上,应用扩散边界层( D B L) 理论模型分析了研究区不同部位的岩溶环境演化趋势.结果表明,由于库水位的大幅度抬升和防渗帷幕的实施,使得研究区防渗帷幕上游岩溶作用的强度减弱;而防渗帷幕下游岩溶作用的强度加强,并发生方解石的沉积作用.这一现象在隔河岩水库蓄水后已经被验证
The study on the groundwater seepage field and the change of karst environment caused by the storage of large reservoirs in the carbonate area is not only a practical engineering problem but also a theoretical issue of karst environment research. Taking Gaobazhou and Geheyan reservoirs for example, the numerical simulation method was used to simulate the characteristics of plane and section flow networks and the spatial variation of groundwater infiltration velocity before and after the impoundment. Based on this, the evolutionary trend of karst environments in different parts of the study area is analyzed using the theoretical model of diffusion boundary layer (D B L). The results show that the intensity of karstification in the upper reaches of anti-seepage curtain decreases due to the drastic elevation of reservoir water level and the implementation of anti-seepage curtain. The strength of karstification in the downstream of anti-seepage curtain is strengthened and the deposition of calcite occurs. This phenomenon has been verified after Geheyan reservoir has been impounded