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西南某岩溶区地下水系统示踪试验与解析
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引用本文:张浪,李俊,潘晓东,黄晓荣,彭聪.西南某岩溶区地下水系统示踪试验与解析[J].中国岩溶,2020,(1):42-47. ZHANG Lang,LI Jun,PAN Xiaodong,HUANG Xiaorong,PENG Cong.Tracer test and analysis of groundwater system in a karst area of southwest China[J].Carsologica Sinica,2020,(1):42-47.
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作者单位
张浪 四川大学水利水电学院成都 610065 
李俊 四川大学水利水电学院成都 610065 
潘晓东 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室广西 桂林 541004 
黄晓荣 四川大学水利水电学院成都 610065 
彭聪 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室广西 桂林 541004 
中文摘要:以西南某典型岩溶区为例,解析示踪试验在岩溶管道连通性以及获取水文地质参数中的应用。选择落水洞为投放点,分别从落水洞西侧和东侧寻找地下水出露点作为接收点,判别落水洞地下径流的实际去向以及落水洞与接收点之间的水力联系。结合Qtracer2软件对示踪试验成果进行定量解析,确定示踪剂回收率、地下水平均流速、最快流速,估算出岩溶管道结构特征和水文地质参数。结果表明:落水洞与接收点JS01、JS03之间不存在直接水力联系;落水洞与接收点JS02存在水力联系且岩溶管道极为发育,含水介质不均匀,地下水运移路径较为通畅,为典型的紊流流态;落水洞地下径流的主要方向是由西向东,但在丰水期雨量较大期间,接收点JS04能够接收到荧光素钠,说明丰水期水位上涨后两者间会有水力联系,导致部分水量向落水洞西侧排泄。
中文关键词:岩溶区  示踪试验  连通性  地下径流  管道特征  水文地质参数
 
Tracer test and analysis of groundwater system in a karst area of southwest China
Abstract:The study area is located in a karst area of Sichuan Province in southwest China. It hosts intense karst development and complex hydrogeological conditions, where underground karst forms include caves, fissures and conduits. Taking this typical karst area as an example, this paper analyzes the application of tracer tests in karst conduit connectivity and acquisition of hydrogeological parameters, analyzes the karst groundwater runoff regular pattern, and estimates the structural characteristics and hydrogeological parameters of karst underground aquifers. These data will facilitate rapid and accurate determination of the scope of groundwater recharge, analyzing the causes of spring discharge cutoff and pollution, and providing a basis for spring protection. First, a sinkhole is selected as the release point, and the groundwater dew point is taken as the receiving point to judge the actual direction of the underground runoff and the hydraulic relation from the west side and the east side of sinkhole respectively. A quantitative analysis of breakthrough curves of the tracers is carried out by Qtracer2, and the tracer recovery rate, average groundwater velocity, maximum velocity, structural characteristics and hydrogeological parameters of the karst conduit are determined. The results show that there is no direct hydraulic relation between the sinkhole and the receiving points JS01 and JS03. While there is a hydraulic link between the sinkhole and the receiving point JS02, where the karst conduit extremely developed, the aquifer medium is uneven, and the groundwater movement path is relatively smooth, which is a typical turbulent flow state. The main direction of the underground runoff of the sinkhole is from west to east. In the period of heavy rainfall during the wet season, the point JS04 can receive sodium fluorescein, indicating that the underground water level increases during the wet season, which will lead to discharge of partial water volume to the west side of the sinkhole.
keywords:karst area, tracer test, connectivity, underground runoff, conduit characteristics, hydrogeological parameters
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