摘要
基于FEFLOW有限元地下水流和溶质运移模拟软件,对武汉市汉江河岸潜流带的非稳定承压水流溶质运移进行模拟研究,并与稳定流情况进行对比。结果表明,①在50年模拟期内,在非稳定流情况下污染物最大迁移距离为274 m,而稳定流模拟情况下的最远扩散距离可达470 m;②污染物的浓度随着垂直深度的增加,在模拟初期和后期分别呈现出浓度逐渐减小和逐渐增大的现象;③污染物在承压含水层底部的扩散距离比浅层远,主要是由溶质锋面最先被迁移和含水层底部地下水流速较大两方面原因所造成的。研究成果可为存在季节性地表水水位变动条件下的河岸潜流带承压含水层的地下水污染防治提供科学参考。
In this paper,the unsteady confined water flow solute transport in the Hanjiang riparian hyporheic zone in Wuhan was simulated and compared with the steady flow situation based on FEFLOW finite element groundwater flow and solute transport simulation software.The results show that:①After 50 years,the maximum transport distance of pollutants is 274 m in the unsteady flow,while the maximum diffusion distance under stable flow simulation is 470 m;②With the increase of vertical depth,the concentration of pollutants gradually decrease in the early period and increase in the late period of the simulation;③The diffusion distance of pollutants at the bottom of confined aquifer is far away from the shallow layer,mainly due to the first migration of solute front and the large groundwater flow rate at the bottom of aquifer.The research results can provide a scientific reference for the prevention and control of groundwater pollution in the confined aquifer of the riparian hyporheic zone with seasonal surface water level changes.
作者
郭昆
李宁
熊启华
王芮琼
廖春来
Guo Kun;Li Ning;Xiong Qihua;Wang Ruiqiong;Liao Chunlai(Geological Environment Center of Hubei Province,Wuhan,Hubei 430034;Hubei Provinical key Laboratory of Resources and Ecological Environment Geology,Wuhan,Hubei 430034;School of Environmental Studies,China University of Geosciences,Wuhan,Hubei 430078)
出处
《资源环境与工程》
2021年第4期551-557,共7页
Resources Environment & Engineering
基金
湖北省地质局科研项目——武汉市典型污染场地周边土壤及水环境质量评价研究(KJ2019—15)。
关键词
河岸潜流带
非稳定流
溶质运移模拟
riparian hyporheic zone
unsteady flow
solute transport simulation
