基于数值模拟的区域性地下水补给过程实例研究

A Case Study on Regional Groundwater Recharge Based on Numerical Simulation

研究主要目的是以数值模拟的方法,再现选定的研究区域20世纪70～90年代地下水位处于较低水平的过程并推求地下水的补给过程.研究区为某流域入海口前10×12km2的矩形区域,基于研究区土层纵断面的物理条件,在平面二维的基础上,考虑含水层垂向水收支成分,利用地下水计算的基本方程式开发地下水准三维数值计算模型,以数值模拟的方法验证模型效率.对地下水位数值模拟的结果表明,模型效率可以达到80％以上.基于1966～2005年的数值计算结果,推求了研究区各含水层的补给过程.研究结果可为区域性地下水数值模拟技术及地下水资源量的评估等研究提供方法上的借鉴.

The objectives of this study were to reproduce the dynamic change process of groundwater in the period from 1970s to 1990s,during which local groundwater was in relatively low level,and to estimate the groundwater recharge process for the specified region by method of numerical simulation.The region which is located at the area in front of an estuary of a watershed （area：10×12 km2） was adopted as the study area.Based on the 2 D numerical method in addition to the physical conditions of the soil vertical profile,a quasi-3 D numerical model was developed by considering water movement in the vertical direction using groundwater flow equation.The results of numerical simulation indicate that model efficiency is more than 80 %; the groundwater recharge process for each aquifer was estimated based on numerical results of 1966-2005.The result of this study is looking forward to provide the reference method for the studies on numerical simulation and assessment of groundwater resources for regional groundwater.