基于FEFLOW的海水入侵数值模拟

在系统分析珠江口东岸地区地质及水文地质条件的基础上,建立了研究区海水入侵三维溶质模型,利用基于有限元原理的FEFLOW软件对建立的模型进行求解,用地下水位和浓度的动态观测资料对模型进行了识别和校验。运用识别后的模型预测了在不同开采条件下,研究区海水入侵的趋势。研究结果表明减少地下水开采量,海水入侵面积可逐步减少,入侵可得到有效控制;在减少开采量的情况下,相较于基岩裂隙含水层,第四系含水层海水入侵面积收缩较慢。

Salt Water Intrusion Numerical Simulation on Application Based on FEFLOW

The seawater intrusion in the region of the eastern Pearl River Estuary has severely deteriorated fresh water quality with the increase of groundwater pumping.Based on analysis of the geological and hydro-geological condition in the study area,a three-dimensional flow and mass transport model has been developed to study the salt water intrusion in the area.Using FEFLOW software based on the finite element theory,this article solves the mathematic model,and calibrates the model by long-term observation data of hydraulic head and chloride concentration.Using the calibrated model,it forecasts the evolution tendency of water saline quality under different conditions of exploitation.The modeling results indicate that： on the condition of reduction exploitation,the extent and area of salt water intrusion in quaternary and bedrock aquifer are gradually decreased and area of salt water intrusion in quaternary aquifer reduced fast than in bedrock aquifer,which provides scientific basis for preventing salt water intrusion in this area.