地下坝防治海水入侵的数值模拟  

Numerical Simulation of Prevention and Control of Seawater Intrusion by Underground Dams

作　　者：宁彩艳 徐立荣 李倩 徐晶 陈学群[2] NING Caiyan;XU Lirong;LI Qian;XU Jing;CHEN Xuequn(School of Water Conservancy and Environment,University of Jinan,Jinan 250022,Shandong,China;Water Resources Research Institute of Shandong Province,Jinan 250013,Shandong,China)

机构地区：[1]济南大学水利与环境学院,山东济南250022 [2]山东省水利科学研究院,山东济南250013

出　　处：《济南大学学报（自然科学版）》2024年第5期533-540,共8页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(42007153);山东省自然科学基金项目(ZR2021MD086,ZR2021ME145)。

摘　　要：针对不同类型地下坝的咸水运移规律缺乏系统研究的问题,利用海水入侵数值模型SEAWAT建立二维变密度流模型,探讨悬浮式、溢流式、全封式地下坝的水平建设位置和建设深度对海水入侵的防治效果。结果表明,悬浮式、溢流式、全封式地下坝都可以减小海水入侵范围和程度,地下坝的水平建设位置应尽可能的靠近海边界;综合考虑地下坝工程效果和环境效能,当地下坝水平建设距离为20 cm、悬浮式地下坝建设深度的变化量为0.875时渗流量减少60.8%,地下坝建设深度建议为含水层厚度的80%左右;溢流式地下坝建设深度的变化量为0.325时,海水入侵的距离急剧减小,地下坝建设高度建议采用最小有效坝高,渗透系数越小,水平建设距离越大,水头差越大,则最小有效坝高越小。Aiming at the lack of systematic research on the brackish water migration law of different types of underground dams,the seawater intrusion numerical model SEAWAT was used to establish a two-dimensional variable density flow model to explore the effect of horizontal construction position and construction depth of suspended,overflow and fully enclosed underground dams on the prevention and control of seawater intrusion.The results show that the suspended,overflow,and fully enclosed underground dams effectively reduce the extent and impact of seawater intrusion,and it is recommended to construct the underground dam as close to the sea boundary as possible.Considering the engineering effects and environmental performance,when the construction distance of the underground dam is 20 cm,the change in the depth of the suspended underground dam construction is 0.875,the seepage decreases by 60.8%,and the construction depth of suspended underground dam is suggested to be approximately 80%of the aquifer thickness.When the depth variation of the overflow underground dam construction is 0.325,the distance of seawater intrusion decreases sharply,and the minimum effective dam height is recommended for underground dam construction,that is,the smaller the permeability coefficient is,the larger the horizontal construction distance and the water head difference are,the smaller the minimum effective dam height is.

关 键 词：海水入侵 地下坝 渗透系数 水头差 数值模拟 

分 类 号：TV138[水利工程—水力学及河流动力学]