滨海地区分层含水层中陆源溶质运移过程  

Study on the transport of land-derived solutes in coastal stratified aquifers

作　　者：沈城吉 李世昌 卜建东 邹永庆 鲁春辉 SHEN Chengji;LI Shichang;BU Jiandong;ZOU Yongqing;LU Chunhui(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Nanjing Hydraulic Research Institute Survey and Design Co.Ltd,Nanjing 210029,China;Beijing Yubing Hydraulic Survey Planning Design Co.Ltd,Beijing 100048,China;Yangtze Institute for Conservation and Development,Nanjing 210098,China;The National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]南京水科院勘测设计有限公司,江苏南京210029 [3]北京禹冰水利勘测规划设计有限公司,北京100048 [4]长江保护与绿色发展研究院,江苏南京210098 [5]河海大学水灾害防御全国重点实验室,江苏南京210098

出　　处：《水科学进展》2023年第6期948-959,共12页Advances in Water Science

基　　金：国家重点研发计划资助项目(2021YFC3200503);国家自然科学基金资助项目(42277416)。

摘　　要：为更好地保护沿海水环境和水生态功能,亟需探究陆源溶质在滨海分层含水层中的迁移机制。构建二维分层含水层数值模型,采用地下水软件SUTRA-MS模拟分析潮汐作用下陆源溶质在分层含水层中的运移特征。结果表明:①与均质含水层相比,弱透水层的存在会延长溶质在含水层中的滞留时间、增大溶质最大扩散面积、削弱溶质在水平方向和垂直方向的扩散程度;②弱透水层能够降低陆源溶质向海水排放的最大通量,并且延长溶质排放的持续时间;③溶质扩散面积、弱透水层中溶质残余量、水平和垂向扩散程度等对弱透水层水力传导系数和厚度的敏感性优于弱透水层深度。To better protect coastal water environment and water ecological functions,it is imperative to explore the transport mechanism of land-derived solutes in coastal stratified aquifers.This study constructed a 2-D numerical model of a coastal stratified aquifer,used groundwater software SUTRA-MS to simulate and analyze the transport characteristics of land-sourced solutes in a tide-influenced coastal stratified aquifer.The results show that:①Compared to a homogeneous aquifer,the presence of a low-permeability layer would prolong the residence time of solute plume,increase its maximum spreading area,and weaken its degree of horizontal and vertical spreading.②A low-permeability layer can reduce the maximum discharge rate of land-derived solute plume and increase the discharge duration.③The hydraulic conductivity and thickness of low-permeability layer exerts more significant influences than the depth on the spreading area,residual mass within the low-permeability layer,and horizontal and vertical spreading of the solute plume.

关 键 词：溶质运移 潮汐 弱透水层 分层含水层 数值模拟 滨海地区 

分 类 号：TV138[水利工程—水力学及河流动力学]