基于有限差分模拟的海水入侵滨海承压含水层水位变化研究

Study on Water Level Change of Seawater Intrusion into Coastal Confined Aquifer Based on Finite Difference Simulation

针对滨海地区承压含水层海水入侵问题,本文基于有限差分法,建立了地下水二维稳定流数值模型。运用有限差分数值模拟软件,计算获得了海平面上升的承压含水层压力水头变化曲线,分析了由于海平面上升所引起的滨海承压含水层水位变化规律。在此基础上,结合具体算例分析了海平面上升高度、含水层渗透系数、截渗墙嵌入深度等因素对海水入侵过程的影响规律。模拟结果表明,此数值模型能准确模拟滨海地区海水入侵过程,并预测滨海承压含水层水位变化,可为滨海地区海水入侵现象的科学预测和防治保护提供支撑。

In this paper, to address the problem of seawater intrusion into the confined aquifer in the coastal area, a two-dimensional numerical model of groundwater steady flow is established based on the finite difference method. By using the finite difference numerical simulation software, the pressure-head change curve of the confined aquifer with the rise of the sea level is obtained, and the change rule of the water level of the confined aquifer in the coastal area caused by the rise of the sea level is analyzed. On this basis, the influence of sea level rise height, permeability coefficient of aquifer and embedding depth of the cut-off wall on the process of seawater intrusion is analyzed with specific examples. The simulation results show that this numerical model can accurately simulate the process of seawater intrusion in the coastal area and predict the water level changes in the coastal confined aquifer, which can provide support for the scientific prediction of seawater intrusion in the coastal area and the prevention and protection of seawater intrusion phenomenon.