中文摘要：

为了研究岩溶包气带洞穴水流的水文过程,在2013年7月1日至2013年11月21日期间,选取桂林丫吉试验场硝盐洞XY5滴水点为研究对象,利用GreenSpanCTDP300多参数仪对其进行了每半小时一次的高频率水文指标监测,分析了包气带洞穴滴水对降雨响应过程及水化学指标的动态变化特征。研究表明：洞穴滴水量、电导率和水温有很好的对应关系;滴水量变化主要受到降雨量、降雨强度和硝盐洞单元体前期含水量的影响,监测期间滴水量变化范围为23.15-589.47 mL/s;水温对降雨响应速度最快且主要受当地气温的影响,流量和电导率基本上表现出同时上升态势,电导率具有季节变化规律,即雨季电导率值较大,波动小,旱季值较小,波动较大;从旱季和雨季的水文过程,并结合旱季滴水主要化学组分的动态变化来看,电导率和水温有3个峰值,不同的峰对应不同产流顺序的水,即裸岩面产生的坡面径流、土壤—基岩界面径流和裂隙水。因此,通过洞穴滴水的水文过程及水化学指标的动态变化特征,可以定性的反映出滴水水源、滴水点运移路径、时间和环境条件的变化。

英文摘要：

Xiaoyan cave is located in Yaji village approximately 8 km southeast of Guilin City in Guangxi（N25°14＇53,E110°22＇33）.Geomorphologically,the cave is on the boundary between adjacent peak cluster and peak forest karst systems.Xiaoyan cave is developed in massive pure Upper Devonian limestone with a bioclastic sparite to micrite texture.The limestones dip gently toward the south-west.The altitude of the cave is 197.5 m.The total length of cave measures 100 m,the width of cave is about 25 m and the thickness of the cave roof is approximately 20—150 m.XY5 is a perennial drip point,which is the largest drip water point in the cave.The overburden above the cave is about 0.3—1 m thick.The area has a subtropical monsoon climate with mean temperature of 18.9℃,and long-term mean annual rainfall of 1 886 mm.In order to study the hydrological processes of cave drip water flow,cave drip water was sampled,and water level,conductivity,and temperature were automatically monitored in Xiaoyan cave＇s karst aeration zone.The response of the drip water,water chemistry and dynamic characteristics to the rain was analyzed.The results indicate that the drip water flow rate,conductivity and water temperature have a good corresponding relationship.Rainfall,rainfall intensity and the pre-rainfall water content of the rock and soil mass overlying Xiaoyan cave are the main factors affecting water flux;the flow rate ranges from 23.15 to 589.47mL/s.Temperature has the fastest response to rainfall,while water flux and conductivity basically increase at the same time.Water temperature is mainly affected by the local temperature.Conductivity exhibits obvious seasonal changes,with higher values and lower amplitude in the rainy season,lower values and and a large amplitude in the dry season.Due to the hydrological processes of the wet and dry conditions,combined with dynamic changes in the main hydrochemical components in the dry season,conductivity and temperature exhibit three peaks.The different peaks correspond to different run