云南鹤庆西山岩溶地下水均衡模拟

Simulation of karst groundwater balance in the Westshan mountains,Heqing county, Yunnan Province

鹤庆西山岩溶地下水是当地人们生产生活的重要水源,开展岩溶地下水均衡调查及计算模拟,掌握研究区岩溶地下水动态,对鹤庆西山地下水资源开发利用及管理有重要的意义。本文在收集研究区地质资料的基础上,对研究区的自然地理条件、地层岩性、地质构造和水文地质条件等地质背景进行分析并划分岩溶地下水系统。采用数值模拟法对云南省鹤庆西山岩溶地下水均衡进行了模拟计算,并与水量均衡法进行了对比。结果表明:岩溶系统划分合理,各岩溶子系统补给与排泄基本均衡;各岩溶子系统的排泄以集中排泄为主,集中排泄占总排泄量的67%~92%;考虑岩溶管道的集中排泄模型更符合研究区岩溶地下水运动特点。

The karst groundwater in the Westshan mountains of Heqing county is an important water resource for local residents.To carry out studies on groundwater balance,flow simulation and the karst groundwater dynamics is of great significance to improve management of the karst groundwater in this area.Based on available data,the physiography,lithology,structure,and hydrogeology of the area are analyzed and the karst groundwater system is demarcated.Numerical simulation is conducted,the result of which is compared with the conventional water balance method.The results show that the karst groundwater system in the study area can be reasonably divided into six sub-systems.The recharge and discharge of each karst subsystem are largely balanced,and the discharge is dominated by a concentrating manner,which accounts for 67%-92% of the total amount.The connectivity test confirms the existence of karst pipelines in the subsystem V,in which the difference between the simulated discharge and the measured spring discharge is minimal,indicating that the model considering the concentrated drainage is more suitable.