桂林东区峰林平原岩溶地下水示踪试验与分析

为查明桂林东区峰林平原地下水系统的结构特征,在岩溶水文地质调查的基础上,通过人工取样并采用高分辨率野外荧光仪,对桂林东区峰林平原区投放的示踪剂荧光素钠的接收情况进行检测。结果表明:峰林平原区地下水的出露比较多,主要以沟渠、湖塘、民井等为主,其中1号点初现时间为第22天,最大视流速为19.5 m/d,平均视流速4.9 m/d,说明本试验段内地下径流为典型的面状流态,岩溶含水介质比较均匀。峰林平原区岩溶含水层结构岩溶化程度很高,呈网络状,存在统一的地下水位,岩溶发育较均一,同时也存在较大的裂隙甚至较大规模的管道和地下河系统,容易形成岩溶地下水优先流。

Karst Groundwater Tracer Test and Analysis of Peak Forest Plain Area in Eastern Guilin

In order to find out the groundwater system structure characteristics of Peak Forest plain,based on the karst hydrogeology survey,and through the artificial sampling and using high resolution field fluorescence spectrometer,the reception of the injected tracer sodium fluorescein in Peak Forest plain of eastern Guilin was detected.The results showed as follows.The plain area of groundwater was exposed mainly in ditches,lakes and wells;and the injected tracer of the number 1 point appeared after 22 days;the maximum flow rate was 19.5 m/d,with an average flow rate of 4.9 m/d;in this test section the groundwater runoff belonged to typical face-like flow pattern,and the karst aquifer media was developed even.The district had a high karstification degree of karst aquifer structure,presenting network-like;there was a uniform water level,and karst development was relatively uniform,as well as large fissures or even large-scale pipelines and underground river system,easy for the formation of karst groundwater preferential flow.