地下水示踪试验中穿透曲线的解析——以平果县平南赤泥堆场地下岩溶系统为例  

Analysis of break through curve in groundwater tracer test——Taking the underground karst system of Pingnan red mud yard in Pingguo County as an example

作　　者：韦栋文 王文海 WEI Dong-wen;WANG Wen-hai(The School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006

出　　处：《地下水》2024年第2期9-12,共4页Ground water

基　　金：国家自然科学基金(51979046);广西科技计划项目(桂科AD21075013);广西高校中青年教师科研基础能力提升项目(2020KY06034)。

摘　　要：地下水示踪试验中的穿透曲线解译是一项重要的技术,通过这一技术,可以获得关于地下岩溶管道的信息,如管道的尺寸、连通性、分布和方向等。然而,在实际应用中,仍存在许多问题需要解决,以提高对穿透曲线的解释准确性和可靠性。以平果县平南赤泥堆场地下岩溶系统为例,利用荧光计获取示踪数据结合Qtracer2软件对示踪剂回收率、平均滞留时间、弥散系数、地下水平均流速等参数进行计算,并结合当前被广泛认同的结论对穿透曲线中的多峰、异常波动等现象进行解释。由于本次研究区的岩溶管道规模小,将岩溶管道的复杂性降低到了可计算程度,对并联岩溶管道长度近似值进行计算,最后排除曲线尾部的峰值为溶质暂态存储现象,分析表明研究区属于多管道岩溶系统,地下水主要表现为“岩溶水扩散流”特征。本研究为地下水数值模型提供了依据,为研究如何分析岩溶复杂介质运移特征提供参考。Interpreting breakthrough curves in groundwater tracer tests is an important technique for obtaining crucial information about underground karst conduit systems,such as conduit dimensions,connectivity,distribution,and direction.However,several challenges still exist in practical applications,which need to be addressed to enhance the accuracy and reliability of breakthrough curve interpretation.In this study,we utilized fluorescence measurements and QTRACER2 software to calculate parameters such as tracer recovery,average residence time,dispersion coefficient,and average groundwater velocity in the karst system underneath the Pingguo County landfill in Pingnan.We also analyzed phenomena observed in the breakthrough curves,including multi-peak and abnormal fluctuations,in accordance with widely accepted theories.Given the relatively small scale of the karst conduits in the study area,the complexity of the conduit system was reduced to a computable level,and an approximate value for the length of the parallel conduits was calculated.Finally,the peak at the tail of the curve was attributed to solute storage,confirming the presence of a multi-conduit karst system in the study area,where groundwater primarily exhibits the characteristics of“karst water diffusion flow”.This study provides a basis for groundwater numerical modeling and serves as a reference for analyzing transport characteristics in complex karst media.

关 键 词：示踪试验 穿透曲线 管道长度 暂态存储 岩溶 

分 类 号：P641.134[天文地球—地质矿产勘探]