于家沟地下水反应溶质运移规律数值仿真

针对矸石淋滤液对于家沟地区地下水污染的实际情况,分析其在含水层中运移的规律,充分考虑了地下水变密度对浓度分布的影响,建立了多组分溶质在地下水中运移的耦合动力学数学模型,采用Galerkin有限元方法和Picard迭代法相结合对耦合模型进行了离散,通过室内土柱实验求得基本参数并对地下水污染的动态过程进行了仿真模拟,预测了污染浓度的时空分布特征。结果表明:污染面积随时间推移不断向两轴方向扩大,且纵向显著;不同组分由于各自特征的巨大差异,受到地下水密度影响的程度也有很大差别;渗滤液浓度拟合误差小于6%,从而验证了模型的可靠性和实用性。

Simulation for Coal Gangue Leachate Transport in Groundwater in Yujiagou

The coal gangue eluviation of Yujiagou of Fuxin coal miming area is studied for the pollution evaluation of groundwater.The mechanism of coal gangue eluviation in the aquifer is analyzed.By considering the effect of variable density groundwater flow on concentration contribution,a coupled numerical model is developed for simulating the multi-component solute transport in groundwater.The model is discreted by using Gelarkin finite-element method and a Picard iteration scheme,the basic parameters are obtained by indoor soil pillar test and the process of coal gangue leaching is simulated with which the temporal and spatial distribution features of solute concentration are predicted.The result indicates that the contaminated plume is continually extended toward two axis as time increases,and the vertical diffusion is more obvious.The concentration distribution of contaminant is subtle to variation of fluid transport,and fluid density can have various effect on different solutes,because their character are different from each other.The average error of eluviation concentration is less than 6% which verifies the reliability and practicality of the model.