重金属在饱和-非饱和分层土壤中迁移过程的三维数值模拟  

Three dimensional numerical simulation of migration process of heavy metal in saturated-unsaturated layered soil

作　　者：刘欢[1] 许诺 孙洪广[1] 胡韬 LIU Huan;XU Nuo;SUN Hongguang;HU Tao(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,College of Mechanics and Materials,Hohai University,Nanjing 210098,China;Nanjing Yanziji Area Renovation and Development Co.,Ltd.,Nanjing 211100,China)

机构地区：[1]河海大学力学与材料学院水文水资源与水利工程科学国家重点实验室,南京210098 [2]南京市燕子矶片区整治开发有限责任公司,南京211100

出　　处：《计算机辅助工程》2022年第3期13-18,共6页Computer Aided Engineering

基　　金：国家自然科学基金(11972148,41931292);江苏省杰出青年基金(BK20190024)。

摘　　要：为揭示重金属在层状土壤中的迁移规律,以某小型污染地块为例,建立三维饱和-非饱和分层土壤溶质运移模型,重点考察不同土体构型、边界水位和污水入渗通量条件下砷(As)的迁移规律和含量分布。结果表明:含As溶液定通量注入土壤20 a, As在砂土夹粉质黏土中的水平迁移距离远大于其在粉质黏土-砂壤土中的迁移距离;粉质黏土层能较好地阻滞As的迁移扩散,且边界水位和污水入渗通量的增加均可增强As的迁移。To reveal the migration law of heavy metal in layered soil, a 3 D solute transport model of saturated-unsaturated layered soil is established based on the measurement data in a small-scale polluted plot. The migration law and spatial concentration distribution of arsenic(As) under different soil configurations, different boundary water levels and different sewage infiltration fluxes are explored. The results show that: after the constant flux of As solution is injected into the soil for 20 a, the horizontal migration distance of heavy metal arsenic insandy soil mixed with silty clay is faster than that insilty clay-sandy loam soil;silty clay layer can slow down the migration and diffusion of As, while the increase of boundary water level and sewage infiltration flux promotes the migration of As.

关 键 词：重金属 溶质运移 层状土壤 土体构型 边界水位 入渗通量 

分 类 号：TP391.99[自动化与计算机技术—计算机应用技术] TB115.1[自动化与计算机技术—计算机科学与技术]