FEFLOW在某市岩溶地下水四氯化碳污染中的应用

Application of FEFLOW in Carbon Tetrachloride Contamination for a City

某市是我国北方的一座大型城市,七里沟盆地是该市的三个主要岩溶水源地之一,供应该市南部20余万人的生产生活用水,2000年11月发现该岩溶含水层受到四氯化碳的污染,本文结合前人所做的工作和研究区检测资料的分析,建立了研究区水文地质概念模型和地下水数学模型,采用基于有限元方法的FEFLOW软件对模型求解,在水流模型的基础上进行溶质运移模拟,模拟了地下水中四氯化碳污染羽的浓度场,并预测了未来浓度场的变化。研究结果表明整个研究区四氯化碳的污染浓度呈衰减趋势,北区和南区衰减趋势明显,中区衰减趋势不明显,污染羽衰减幅度随着时间的推移在降低。研究成果为今后类似条件下的区域性污染处理工作提供了技术支持。

The city is a big city in north China,Qiligou basin is one of the three chief karst water supply resources,which guarantees more than 200 thousand people in the south city of the production and living water.This karst aquifer was found that has been polluted by carbon tetrachloride in November of 2000.Through analysis of the monitoring data in the studied area,conduced to establishing the hydro-geological conceptual model and the groundwater flow model that was computed by using FEFLOW(Finite Element subsurface Flow system) software,the solute transport simulation based on the current model,to simulate the groundwater pollution concentration of carbon tetrachloride,and forecast the future changes in the concentration field. The results indicated that the carbon tetrachloride contamination plume presented a degrading trend in the whole area,especially in the north and south part,but in the central part it is not obvious;in process of time,the attenuation extent of carbon tetrachloride plume is declining.These studies provided technical supports to the regional pollution treatment under the similar circumstances in the future.