锶、铀在非均质含水层中迁移特性试验研究

对于地下水流场及其参数分布无序的非线性问题，污染物在其迁移便不可能服从对流-弥散方程所描述的规律。那么，锶、铀在非均匀介质中迁移会发生什么样的异常变化是提出地下水污染预测方法与模式的前提。根据野外调查的水文地质特征，设计出模拟迁移的试验研究的模式系统。试验表明，非均质试验柱的迁移曲线与均质的迁移曲线，总体特征有显著区别；透镜状和盲洞型非均质对迁移的影响及其环境效应是双向的，即有利面是降低了污染强度，且可降低10%～30%；不利面是延长了污染作用的时间，使污染作用时间延长3～5倍。另外，合理地解释了所谓“双峰”和“多峰”迁移曲线机制。

Experimental research on migrating characteristics of Sr and U in nonhomogeneous aquifer

For the disorderly distributed nonlinear problems of groundwater flow field and its parameters, the migration of pollutants cannot obey the convection-dispersion equation. For this reason, what abnormal change would happen during the migration of Sr and U in nonhomogeneous media is the premise to provide the groundwater pollution forecasting methods and models. To this end, based on the investigation, we use the analysis methods to design model system for experimental study. Results show that the migration curves of nonhomogeneous test column and the homogeneous one are significantly different in the overall features. For the migration and environmental effects, the impact of the lenticular and blind-hole-type nonhomogeneous is a double-edged sword.The advantage is the reducing of pollution intensity, and the disadvantage is that the pollution action time is extended. Preliminary laboratory tests indicate that the pollution intensity may decreased by 10%-30%; however, the pollution action time is 3-5 times longer. In addition, we explain the migration curve mechanism of the so-called twin peaks and multi-peak, which are people concerned about.