苏北某化工地下水污染运移数值模拟研究

Numerical Simulation of Groundwater Pollution Transport in a Chemical Industry in Northern Jiangsu

针对江苏北部某氨氮、硝酸盐等超标典型化工企业地块,建立了场地浅层地下水水流模型和溶质运移模型。其中水流模型选择通用的MODFLOW软件求解,溶质运移模型选用MT3DMS软件计算。基于场地地下水流场和污染物初始浓度场,在不考虑污染物在含水层的吸附、挥发、微生物降解等作用的前提下,数值模拟了污染发生后不同时间的氨氮、硝酸盐浓度迁移分布。基于模型预测结果评估了场地地下水污染对周边地表水体的影响,提出了管控措施。

Aiming at a typical chemical enterprise plot with excessive ammonia nitrogen and nitrate in northern Jiangsu,the shallow groundwater flow model and solute transport model are established.Among them,the general MODFLOW software is selected to solve the water flow model,and the MT3DMS software is selected to calculate the solute transport model.Based on the groundwater flow field and the initial con-centration field of pollutants in the site,the migration and distribution of ammonia nitrogen and nitrate concentration at different times after pollu-tion occurred were numerically simulated without considering the adsorption,volatilization and microbial degradation of pollutants in the aquifer.Based on the prediction results of the model,the influence of groundwater pollution on the surrounding surface water bodies is evaluated,and the control measures are put forward.