宏观各向异性多孔介质中流体变形及溶质运移  

Fluid deformation and solute transport in macroscopic anisotropic porous media

作　　者：叶逾 张宇 蔡芳敏 谢一凡 鲁春辉 YE Yu;ZHANG Yu;CAI Fangmin;XIE Yifan;LU Chunhui(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China;Yangtze Institute for Conservation and Development,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]河海大学长江保护与绿色发展研究院,江苏南京210098

出　　处：《水科学进展》2021年第6期903-910,共8页Advances in Water Science

基　　金：国家自然科学基金资助项目(51709085);中央高校基本科研业务费专项资金资助项目(B200202158)。

摘　　要：为深入探究含水层中多孔介质的不规则形态和分布对于地下水流场及溶质运移的作用,根据沉积环境中已被发现的倾斜交叉分层地质单元结构,人为构造多孔介质双层交叉鱼骨结构,使其形成宏观各向异性水力传导特征,通过数值模拟研究该结构及其空间位置对于流场和溶质运移的影响。研究发现:宏观各向异性多孔介质引发了螺旋状流动,导致流线的拉伸和折叠,使得溶质羽发生不规则变形,显著提升了非反应性溶质的稀释程度;宏观各向异性结构和溶质羽在三维空间中的垂向相对位置对于溶质运移具有显著影响。To investigate the effect of irregular shape and distribution of porous media on groundwater flow and solute transport,a double-layer herringbone structure was artificially constructed and numerical simulations of groundwater flow and transport were performed.Such a structure simulates the existing inclined cross-bedding geological features and forms macroscopic anisotropic hydraulic conductivity field.The results show that the macroscopic anisotropic structure creates helical flow,leading to the stretching and folding of the streamlines and the irregular deformation of the solute plume,and thus,solute dilution is enhanced significantly.The vertical relative position between the macroscopic anisotropic structure and the solute plume has a remarkable effect on solute transport.

关 键 词：流体变形 溶质运移 宏观各向异性 螺旋状流动 拉伸和折叠 稀释 数值模拟 

分 类 号：TV138[水利工程—水力学及河流动力学]