典型岩溶地下河入、出口处强降雨过程中水动态变化

Study on dynamic variation of hydrological regime at inlet and outlet of typical underground river of karst valley during a large storm

在强降雨过程中,对典型岩溶地下河入口、出口处pH值、电导率、水温、水位进行监测,对比分析了强降雨过程中该地下河入口、出口处水动态变化特征,及入口处水动态变化对出口处的影响。结果表明:强降雨过程中,地下河系统水动态变化对降雨的响应速度快,降雨随岩溶裂隙进入地下河迅速,岩溶含水层对强降雨过程中水资源调蓄能力差。地下河入口、出口处水动态变化差异性较大,上游地下河入口处水化学特征变化速度快,幅度大,受环境影响因素大。地下河出口处水化学变化较上游有规律,主要受稀释作用影响。影响入口处水动态变化的环境因素对出口处水动态变化影响不明显。

The pH, conductivity, water temperature, water table of inlet and outlet of typical underground river were monitored during a large storm. The dynamic change characteristics of hydrologic regime between the inlet and outlet were analyzed. Results showed that the dynamic changes of hydrological regime of subterranean stream rapidly responded to rainfall during storm. Rainfall rapidly infiltrated into the underground river through karst fissure and the water storage capacity of karst aquifer was poor in larger storm. The dynamic changes of hydrologic regime at inlet and outlet had relatively large difference. At inlet the hydro-chemical characteristics changed rapidly, the magnitude of the variation was large and the change of hydrologic regime was controlled by environment factors. At outlet the hydro-chemical characteristics seemed steadily and were controlled by dilution effect. The environmental factors influencing the dynamic changes of hydrologic regime at the inlet had no effect on the outlet.