基于溶质运移模拟的某化工场地污染物对拟建水库污染风险预测  

A Chemical Site's Pollution Risk Prediction to the Proposed Reservoir Based on Solute Transport Simulation

作　　者：王平[1,2] 黄爽兵[1,2] 韩占涛[1,2] 马丽莎[1,2] 张威[1,2] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]河北省地下水污染机理与修复重点实验室,河北石家庄050061

出　　处：《现代地质》2015年第2期307-315,共9页Geoscience

基　　金：中国地质调查局国土资源评价项目(12120113102700)

摘　　要：溶质运移模拟是污染风险预测的一种有效手段。本研究为查明研究区内某有机污染场地作为污染源对拟建水库的影响,基于对区内流场的精确测量,建立了准确的地下水流模型和化工厂泄露有机污染物的溶质运移模型,预测分析了研究区拟建水库修建前、后地下水流场及污染物迁移情形的变化。模拟结果表明:水库和周边两种设计水头的截渗沟建成后,改变了自然条件下的流场,形成水库向截渗沟排泄、截渗沟向周边排泄以及水库和周边区域均向截渗沟排泄两种地下水流场。某些污染羽扩散范围虽比自然条件下有所增大,但向水库方向的扩散均未超出300 m,不会对水库水质构成污染风险。Solute transport simulation is one of the most reliable approaches for groundwater pollution risk as- sessment. In this paper, to understand the effect to the reservoir from an organic contaminated site as the source of pollution, a precise flow simulation and a solute transport model of organic pollutant leaked from the chemical plant were built based on accurate measurement of flow field in the study area to estimate and analyze the change of groundwater flow and pollution migration after the reservoir built. The simulation results showed that, after the reservoir and two seepage intercepting ditches which had different water levels were built, groundwater flow would change to two kinds of groundwater flow fields, in one condition of which the reservoir would discharge to ditches and the ditches would discharge to vicinity area, while in the other condition the reservoir and vicinity area would both discharge to the ditches. In the two cases, some contaminant plume diffusion were farther than normal condition, but all the diffusion lengths in the direction of reservoir were less than 300 m, so it indicated that the contaminated site will pose no pollution risk to the water quality of reservoir.

关 键 词：地下水 污染风险评价 溶质运移 数值模拟 

分 类 号：P641.69[天文地球—地质矿产勘探] P641.8[天文地球—地质学]