降雨条件下岩溶槽谷泉水的水文地球化学特征

在示踪试验判断岩溶含水介质形态的基础上，通过观测降雨条件下姜家泉泉水的电导率、pH值、水温、泉口实时水位、降雨量以及降雨的pH值、钙离子浓度、电导率和计算出的泉水方解石饱和指数及CO2分压，分析了降雨条件下岩溶槽谷泉水文地球化学行为的动态变化。研究结果表明在以管道为主的岩溶含水介质槽谷中，泉水水位随降雨暴涨暴落，其水温、电导率、pH值、方解石饱和指数和CO2分压对降雨响应迅速，能敏锐地感应和反馈环境的变化。酸雨将可能引起泉水pH值的降低和电导率的升高，因而应重视酸雨对岩溶泉水文地球化学行为和岩溶含水介质演化过程的影响。降雨期间雨水将地表土壤带入地下河，引起泉水浊度的升高，表明此时泉水可能受到微生物的污染。

Response of spring water hydrochemical behaviors to rainfallin karst subterranean river system

On the basis of deducing the feature of karst media, the conductivity, pH, water temperature, realtime water level at outlet of Jiangjia spring, rainfall data, were observed to investigate the response of spring water dynamic hydrochemical behaviors to rainfall in Qingmu Guan karst subterranean river system. The calcite saturation index and carbon dioxide partial pressure were calculated by using the software WATSPEC. The results show that the hydrochemical response of the subterranean river system, where a well developed and connected conduit system existes for underground flow, to rainfall is very fast. The water level varies abruptly following the rainfall and electrical conductivity, water temperature, pH, calcite saturation index and carbon dioxide partial pressure also response rapidly to the change of environment. The acid rain probably causes the pH reduction and increase of electrical conductivity of spring water. The turbidity of spring water increases due to the surface soil erosion scoured by the rainfall.It indicates that the water is polluted by microorganism.