非等温条件下潜水含水层坝后残留咸水淡化过程研究OA北大核心CSTPCD

Widespread use of subsurface dams as an effective control mechanism may hinder the flow of fresh groundwater and the removal of residual saltwater in landward directions.Periodic temperature fluctuations in aquifers and oceans can have an effect on the desalination process used to remove remai-ning saltwater.However,temperature impacts on residual saltwater removal procedures are poorly known.Based on a field-scale numerical model with groundwater-salt-heat coupling,this work explored the thermal effects on the desalination process and evaluated the dynamics of the remaining saltwater wedge length and the overall residual salt mass.The findings indicated that the length of the desalina-tion process lowers dramatically as seawater temperature rises.Compared to the isothermal desalination process,the most notable differences are the density shift owing to thermal impacts and the difference in hydraulic conductivity between seawater and fresh water.The increase in ocean temperature greatly shortens the time required for the groundwater discharge process to attain equilibrium.The flow veloci-ty in LCMZ is the primary factor affecting the time necessary to reach dynamic equilibrium.