单井注抽试验测算地下水流速的数值分析  

Numerical Analysis of Estimating Groundwater Velocity through Single-Well Push-Pull Test

作　　者：李旭[1] 苏世林 文章[2] 许光泉[1] Li Xu;Su Shilin;Wen Zhang;Xu Guangquan(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;School of Environmental Studies,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽准南232001 [2]中国地质大学环境学院,湖北武汉430074

出　　处：《地球科学》2022年第2期633-641,共9页Earth Science

基　　金：安徽高校自然科学研究重点项目(No.KJ2020A0316);安徽理工大学引进人才基金(No.13200399)。

摘　　要：为了分析注入阶段地下水流速及含水层弥散度对单井注抽试验解析模型测算地下水流速的影响机理,通过采用GMS(groundwater modeling system)软件建立了单井注抽试验数值模型,通过与Leap and Kaplan(1988)近似解析模型计算结果对比分析上述因素对解析模型计算结果的影响.研究结果表明:地下水流速越大或自由迁移阶段时间越长,近似解析模型计算的误差越大;注入阶段地下水流速的作用对溶质羽质心迁移的影响较小,故近似解析模型中考虑注入阶段质心位移会导致计算误差增大;含水层弥散度越大,解析模型计算的误差越大.总体而言,注入阶段地下水流速对近似解析模型计算结果影响较小,而弥散度有着显著的影响.For the purpose of analyzingthe influencingmechanism of groundwater flow velocity in the injection phase(GFVIP) and dispersivity on calculation of groundwater velocity, this study employed GMS(Groundwater Modeling System)to develop numerical models of single-well push-pull(SWPP) test, and the numerical results are compared with theapproximately analytical ones of Leap and Kaplan(1988)to uncover the effects of GFVIP and dispersivity on the calculation accuracy of the analytical model. The results indicate that a larger groundwater velocity or a longer drift time results in a larger misestimation of groundwater velocity bythe model of Leap and Kaplan(1988);GFVIP has little impact on the migration distance of solute plumecentroid, thus the impact of GFIP on the approximately analytical model can be neglected. Additionally, a greater dispersivity results in a more significant calculation error by the model of Leap and Kaplan(1988). Overall, the GFVIP has limited influence on the calculation results by the approximatelyanalytical modelof Leap and Kaplan(1988), while dispersivity has remarkable influence on the estimation accuracy.

关 键 词：单井注抽试验 地下水流速 穿透曲线 溶质运移 水文地质 

分 类 号：P641.2[天文地球—地质矿产勘探]