河流污水非饱和入渗对沿岸地下水质的影响

在分析河流污水非饱和入渗过程和输移机理的基础上,建立了河流污水非饱和入渗对沿岸土壤及地下水质影响的预测预报模型。该模型将水力传导率分离为饱和水力传导率项和相对水力传导率项,并运用全隐式差分和时间中心差分格式分别离散,计算过程中根据土壤饱和度调用不同格式,克服真解波动和耗散现象。取得了良好效果。以江苏省徐州市奎河的徐村和黄桥河段污水中的保守性污染因子Cl-和非保守性污染因子氮为例,研究非饱和入渗污染物在土壤及地下水中迁移转化过程的模拟模型参数,运用所率定的参数进行预测计算,计算值与相关的实测值进行对比分析,结果表明,两者吻合良好。

Impacts of river wastewater unsaturated filtration on its offshore soil and groundwater quality

A mathematics model forecasting the impacts of river wastewater unsaturated filtration on its offshore soil and groundwater quality is established based on the analysis of the river wastewater unsaturated filtration and the transportation mechanism.The implicit difference method and the time-center difference formats are performed in the disperse equations,which have obtained good effects.The conservative pollutant Cl^- and non-conservative pollutant nitrite of river wastewater are taken as examples to study the model parameters of the transportation and transformation of the unsaturated filtration pollutants in the soil and groundwater.Finally the model is verified by the field data of Xucun and Huangqiao's cross sections in Xuzhou,Jiangsu province.The result shows that the calculated data agrees with the measured data.