参数随机模拟在地下水溶质运移数值模拟中的应用

从水文地质参数的随机性出发,以我国南方某大型铀尾矿库为例,采用GMS软件(地下水模拟系统)建立了参数随机模拟的数值模型,分析了渗透系数的空间变异性对地下水溶质运移的影响.结果表明:渗透系数的空间变异性对地下水溶质运移结果有较大的影响.在其它条件都相同的情况下,随着渗透系数标准差的增大,污染物运移的范围扩大,污染物浓度标准差等值线图变得越来越不规则,污染物质心位置偏离面源中心.

Application of stochastic parameter simulation to groundwater numerical simulation of solute transport

In consideration of the stochastic property of hydrogeology parameter, the groundwater modeling system GMS software was adopted to develop a numerical model for stochastic parameter simulation of a large uranium tailings impoundment in South China. The effect of the spatial variability of pemeability coefficient on solute transport in groundwater was analyzed. Results show that the spatial variability of pemeability coefficient exerts great effects on the results of solute transport in groundwater. At the same conditions, along with the increase of the standard deviation of hydraulic conductivity stochastic field, the range of contaminant migration expand, contour maps of the standard deviation for pollutant concentration become more and more irregular. Meanwhile, the centroid position of contaminant deviates the center of non-point source.