HYDRUS-1D软件在地下水污染源强定量评价中的应用

以垃圾填埋场渗滤液中的氨氮为研究对象,利用HYDRUS-1D模型模拟其在包气带中的迁移转化规律,最终预测出氨氮到达地下水位处时的浓度值。引入折减系数的概念,通过改变填埋场渗滤液中氨氮的初始浓度及土壤包气带结构,计算不同输入条件下的折减系数值,用其综合反映包气带对于某一特征污染物的衰减能力,为地下水污染源强定量评价提供数据支持。

Application of HYDRUS-1D model in quantitative assessment of groundwater pollution resource intensity

Ammonia nitrogen from leachate leakage in landfill was selected as the target contaminant. HYDRUS-1D model was used to simulate the migration and transformation law in vadose zone and then to predict ammonia nitrogen concentrations at the shallow aquifer. The concept of reduction factor is introduced to quantify the antifouling performance of vadose zone. Different reduction factors are calculated by changing the input concentrations of ammonia nitrogen from leachate leakage and the structure of vadose zone. Accordingly, the factors are used to reflect the reduction ability of vadose zone for the contaminant. The analytic results could provide data support for quantitative assessment of groundwater pollution resource intensity.