川东平行岭谷典型岩溶含水介质特征的识别方法探讨——以重庆青木关地下水系统为例

A Methodological Research on the Identification of a Typical Karst Aquifer Media in the Paralleled Ridge-Valley of East Sichuan——A Case Study of Qingmuguan Karst Groundwater System,Chongqing

采用流量指数衰减法、示踪试验法、地球化学法等3种方法,探讨重庆青木关岩溶含水介质的组合情况.通过流量指数衰减法计算发现,研究区地下水系统管道水和裂隙水分别占含水层水资源量的16.7%和83.3%,裂隙介质在地下水资源的调蓄中发挥着重要的作用;示踪试验表明,研究区发育有一条规模较大的岩溶管道,管道直径为数米级;水化学和δD,δ18 O值表明,研究区地下水系统的含水介质为裂隙和管道介质并存.研究认为,可用流量指数衰减法查清不同含水介质的构成,辅助以示踪试验法计算管道直径及相关的水文地质参数,并圈定流域范围,地球化学法作为以上2种方法的补充.

Methods of discharge recession equation,tracing test,and geochemistry were employed to investigate the karst aquifer media in the Qingmuguan groundwater system,a typical karst aquifer in the Paralleled Ridge-Valley of East Sichuan.Result of the discharge recession method showed that the media of karst were comprised of conduits and fissures with a rate of 16.7% and 83.3%,respectively.The fissure medium played a significant role in the regulation of groundwater resources.The tracing test showed that a large scale of karst conduits developed in the study site with a diameter of several meters.The methods of hydrochemistry andδD andδ18 O indicated that the media of karst conduits and fissures coexisted in the groundwater system.In conclusion,composition of different aquifer media can be defined by the equation of discharge recession,supplemented with tracing test for the calculation of the diameter of the karst conduit and the relevant hydrogeological parameters,and the identification of the watershed boundary.Geochemical method acts as a supplement of the two methods mentioned above.