摘要
交通运输过程中产生的路面径流污染有可能对路线周边环境造成不利影响.对污染物在公路周边土体中的溶质运移规律进行探讨具有重要的理论价值和工程意义.本研究基于土柱溶质运移试验成果,引入实测的边界浓度曲线,采用一维数值计算程序Hydrus-1D,对土柱出口处溶质浓度在试验过程中的变化规律、典型时刻溶质浓度沿土柱的分布规律等进行验证分析.然后,考虑公路路面径流污染物的特点,重点分析弥散系数、吸附因子以及化学反应参数三个关键因素对土柱溶质运移规律的影响.分析结果表明,化学反应参数对溶质运移的影响最大,其次是吸附因子,而弥散系数对其影响最小.计算参数的变化均有可能引起峰值浓度和出水口溶质浓度的改变,因此在实际应用时须考虑土体的性质、溶质类型等诸多因素.在探讨影响溶质运移的主要因素后,选取了适当的计算模型进行分析.
With the continuous increase of highway construction and rapid development of industry,highway transportation may potentially cause pollution and environmental problem,so it is of great significance to study behavior of solute transportation in soil close to highway.For these reasons,test results of solute transportation in previous soil column test were introduced,and measured concentration at the top of soil sample was applied to solve change of concentration at the bottom by commertially avaiale software Hydrus-1D.The distribution of solute concentration along soil column at certain times were also calculated.Then,due to compostion characterisic of solute washed from pavement of highway,three main factors（diffusion coefficient,absorption factor,the rate of reaction parameter） were analyzed.Calculated results indicated the rate of reaction parameter plays the most important role,and then the absorption factor,and the diffusion factor.Change of parameter will induce change of computational results such as the largest concentration and solute concentration at the bottom of soil column.When the method is put into practice,factors such as soil behvior,type of solute should be considered and proper model should be introduced.
出处
《长沙理工大学学报（自然科学版）》
CAS
2011年第4期1-5,11,共6页
Journal of Changsha University of Science and Technology:Natural Science
基金
西部交通建设科技资助项目(2009318000048)
关键词
交通工程
溶质运移
土柱试验
敏感性分析
transportation engineering
solute transportation
soil column test
factor analysis
