利用GMS模拟预测崇左市拟建稀土分离项目影响区岩溶水污染

Prediction of ground water pollution in karst aquifer with conduit based on GMS simulation in Chongzuo of Guangxi

为了预测稀土分离项目在生产过程中可能对当地地下水环境造成的污染状况,运用GMS软件模拟在各类污水泄漏突发事件时污染物在岩溶含水系统中的运移。模拟结果表明:影响区域内地下水在以裂隙-孔隙控制的岩体介质内的运动速度十分缓慢,污水渗漏点离北侧的岩溶管道还有一定的距离,污水从入渗点下渗后因未能很快流入岩溶管道,污染物在岩体介质中的运移主要以分子扩散为主,其污染晕大致呈圆形向四周扩散;未经处理的污水若发生泄露下渗,将会在含水层内形成浓度较高的污染晕,引起地下水严重污染。

In order to predict the karst ground water polluted by a REE separation project in Chongzuo,GMS software was used to simulate the migration of contaminants in various kinds of sewage leaking emergencies. The simulation results showed that as the migration of contaminants in the aquifer was very slow,there was a certain distance from the seepage point to the pipes of north side,and the pollution plume was roughly round. The analysis shows that the the migration of contaminants can be classified as molecular diffusion.The slow mi-gration of polluted ground water was caused by the slow flow of the ground water in rock matrix on the leaking site and the polluted ground water could not immediately flow into karst conduits.The untreated sewage can form a high concentration of the pollution plume and pollute the karst ground water seriously.