示踪弥散试验影响因子分析

污染物质在含水介质中的运移，不仅受到水文地质条件的制约，而且受水化学动力条件的制约。示踪弥散试验常用于模拟地下水污染物质的运移研究，为污染预测和污染防治提供依据。试验选用NaCl为示踪剂，砂土为介质。在室内进行一维弥散试验，针对示踪剂的浓度、水力梯度、砂土干密度等影响因素，进行系统分析。结果表明，弥散系数与NaCl浓度、水力梯度成正比，与砂土干密度成反比。

Analysis of Impact Factors in Tracer Dispersion Test

As the migration of contaminants in aquifer media is not only affected by hydro - geological conditions, but also restricted by the hydrochemical dynamic conditions, tracer dispersion test is always applied to simulate the migration of contam- inants in groundwater. The result also contributes to pollution prediction and pollution prevention. Taking NaCI as the tracer and sandy soil as the medium, one dimensional dispersion experiment is carried in lab to analyze effects of impact factors such as tracer concentration, hydraulic gradient and dry density of sandy soil. The result shows that the dispersion coefficient is pro- portional to NaC1 concentration and hydraulic gradient, while is inversely proportional to the dry density of sandy soil.