摘要
地表河流入渗补给地下水是自然界普遍存在的一种现象。近些年,由于地表河流污染的加剧,污染的河流下渗,必然伴随着污染物对影响范围内的非饱和带土壤造成生态破坏。采用Hydrus软件构建二维饱和-非饱和数值模型,为各影响因子构造3种不同的情景模式,探讨河流影响下的包气带水分及溶质运移随各参数变化而改变的过程。研究结果表明,VG模型5个参数θ_r、θ_s、α、n、K_s对压力水头和溶质运移均具有不同程度的影响,与土壤饱和程度具有一定的相关性,其中θ_s、α、n、K_s的影响较为显著,而θ_r的影响则比较小。
Groundwater recharged by the river on ground surface is a common phenomenon in the natural world. In recent years, due to the intensification of river pollution, the infiltration of polluted river must be accompanied by pollutants transport to the unsaturated zone and caused damage to the ecology. In this study, a two-dimensional unsaturated-saturated numerical model based on Hydrus software was used to investigate the changes of water and solute transport with parameter variation in the unsaturated zone under the influence of river, and three different scenarios were built for every influence factor. The results of the study show that ： The five parameters of θ_r、θ_s、α、n、K_s in VG model have a different influence on the pressure head and solute transport, and the five parameters have a certain correlation with the degree of saturation, the effect of θ_s、K_s、α、n is significant, and the effect of θ_s is relatively small.
出处
《华北水利水电大学学报（自然科学版）》
2017年第2期72-76,共5页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家科技支撑计划课题(2013BAC10B02)
国际科技合作项目(2013DFG70990)
