基于Hydrus-1D预测模型的包气带溶质运移研究

Study on solute transport in Vadose zone based on Hydrus-1D model

对于环境敏感程度等级高的Ⅰ类建设项目而言,采用定性描述和类比分析对土壤环境影响进行论述评价不甚合理。本文以某危险废物处置类建设项目为例,应用Hydrus-1D预测模型研究了污染物溶质在包气带中的运移情况,结果表明:当污染物砷、铜、铅、镍持续点源垂直入渗100 d后最大下渗距离分别约为1.40、1.65、1.44 m和1.49 m,各污染物分别约在215、155、210 d和200 d时运移抵至稳定潜水面。该方法能定量研究污染物在土壤中的时空变化情况,可为类似高评价工作等级的污染影响型建设项目包气带溶质运移研究提供一种参考。

For the classⅠof construction projects with high environmental sensitivity level,it is not reasonable to discuss and evaluate the soil environmental impact by using qualitative description and analogy analysis.Taking a hazardous waste disposal project as an example,the transport of pollutant solute in the gas zone was studied by Hydrus-1D prediction model.The results show that:the maximum infiltration distance of arsenic,copper,lead,nickel and vertical is 1.40 m,1.65 m,1.44 m and 1.49 m when mcontinuous point source infiltration after 100 d,and the pollutants are transported off to the phreatic surface at about 215,155,210 d and 200 d,respectively.This method can quantitatively study the spatial and temporal changes of pollutants in soil,and provide a reference for the study of solute transport in the gas entrainment zone of pollution-affected construction projects with high evaluation.