Numerical Simulation of Prevention and Control of Seawater Intrusion by Underground Dams
Aiming at the lack of systematic research on the brackish water migration law of different types of underground dams,the seawater intrusion numerical model SEA WAT 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 construc-tion 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 perme-ability coefficient is,the larger the horizontal construction distance and the water head difference are,the smaller the minimum effective dam height is.
seawater intrusionunderground dampermeability coefficientwater head differencenumerical simulation
万方数据
维普
