鲁西平原济宁市北部裂隙岩溶地下水补给机理研究

Study on Recharge Mechanism of Fracture Karst Groundwater in North Jining of Luxi Plain

鲁西平原地区赋存较丰富的岩溶地下水，埋深一般在80～200m，其中济宁市北部的岩溶水已被当地政府纳入综合开发利用规划。但该岩溶水系统的补给机理一直是水文地质工作者们关心的问题，这为准确评价该地区岩溶地下水水资源量增加了一定的难度。传统观点认为，济宁北深层岩溶水的主要补给来源是南部裸露山区的降水人渗补给，但笔者经计算，发现南部裸露区降水人渗补给量远远不能满足现状开采量，这说明该岩溶地下水系统还有其它补给途径。该文通过对地下水位动态、水化学特征、水中铀同位素组成特征及抽水试验资料的分析，认为上覆孑L隙水的越流补给才是该岩溶水系统最主要的补给来源。

The Ialxi plain is rich in karst groundwater and its buried depth is generally 80 - 200m. The karst water in north Jinning has been brought into the comprehensive development plan by local government. But the recharge mechanism of karst water system has been the concerned problem of hydrogeologist, and it adds to the difficulty to evaluate the karst groundwater resource volume in the area. According to traditional view, the main recharge source in the area is precipitation infiltration recharge from its south bare mountain. However, the au- thor discovers that the source is not far enough to meet the current groundwater extraction volume, which means that the area has other recharge sources. Based on the groundwater dynamic level, hydroehemieal characteris- tics, water uranium isotope characteristics and the analysis of pumping test, it shows that the leakage recharge from its upper pore water is the main recharge source of the karst water system.