摘要
包气带是连接地表水和地下水的重要通道,对地下水资源有很好的“屏障”功能,而近年来工农业废水及生活污水的大量排放已影响到了地下水的“安全”。为此,在渭河河漫滩进行了模拟河流的垂向入渗试验,并通过建立数学模型对水分和六价铬在具有弱透水层的多层介质中的迁移进行了模拟运算。试验和模拟结果一致表明,弱透水层虽对地下水有很好的保护作用,但在上部土壤层易形成面状污染带,而且由于大的浓度梯度作用,一旦污染质穿透该层将很快污染到地下水。
Groundwater is an important source of water supply. The unsaturated zone is a key passage from surface water to groundwater; it is important in preventing groundwater pollution due to infiltration of surface water. A vertical infiltration experiment was performed in Weihe River beach near Xian to validate the numerical model which was developed for simulating the infiltration of river water and vertical movement of Cr（Ⅵ ） in a multi-layer, multimedia aquifer system. The experiment results agreed Well with the model simulations showing that the aquitard was capable of protecting the groundwater and that the groundwater could be contaminated quickly after a pollutant had passed through the aquitard due to accumulation of the pollutant and the resulting high concentration gradient of the pollutant in the soil above it.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第2期110-114,共5页
Environmental Pollution & Control
关键词
渭河
数值模拟
含水层
多层介质
垂向迁移
污染质运移
Weihe River Numerical simulation Aquifer Multi-layer media Vertical movement Pollutant transport
