非均质含水层中地下水年龄数值模拟

地下水年龄数值模拟是近年来国际地下水领域的一个全新研究方向。在简单介绍地下水年龄数值模拟相关理论和方法基础上,通过一个简单算例模拟对比了稳定流条件下不同非均质含水层中的水流运动和年龄分布,探讨了夹层透水性的强弱对地下水年龄分布的影响。结果表明,在地下水系统保持补径排通量不变的前提下,弱透水夹层的存在对于特定区域地下水的深部循环和更新具有积极作用。同时,在模拟区域深部含水层的年龄分布时,不能忽略其弥散作用。地下水年龄模拟为研究区域尺度上的地下水循环和地下水资源可持续利用提供了一种新的途径。

Numerical Modeling of Groundwater Age Distributions in Heterogeneous Aquifers

Recently numerical modeling of groundwater age has become a new direction in groundwater research because groundwater age in a particular aquifer records the history of different periods of groundwater advection,dispersion and hydrodynamic mixing.Under steady flow conditions,assuming the same groundwater recharge,runoff and drainage,the groundwater flow and age distributions are demonstrated in this study through a synthetic application with the different heterogeneities.The results indicate that interlayers with low permeability have a positive effect for the deep regional groundwater circulation and update.Meanwhile,the results show that the groundwater dispersion plays an innegligible role in modeling groundwater age in regional-scale deep aquifers.Groundwater age modeling provides a new way for the study of groundwater circulation and sustainable use of groundwater resources on a regional scale.