河流泥沙与污染物相互作用数学模型

Numerical model for interaction between sediment and pollutant in river

本文分析了水流-泥沙-污染物系统中主要物理化学过程对水体污染物的影响,以此为基础推导了描述吸附态、溶解态污染物迁移转化的基本方程。对于河床水体之间泥沙交换产生的环境变化,建立了泥沙冲淤对污染物影响的表达式,对于吸附解吸作用则采用以实验为基础的泥沙吸附动力学模式。根据三峡地区实测水沙、水质数据对模型进行了验证,研究结果表明,模型能够模拟泥沙冲淤过程中污染物的交换,并且可以反映泥沙吸附作用对水环境的动态影响,可以应用于河流及水库泥沙污染物相互作用的模拟和分析。

Based on the analysis on the influence of physical-chemical process on water pollution the basic equations for describing the transport and transform of soluble and absorbable pollutant in sediment flow are established. The expression for describing the effect of erosion and deposition process of sediment on pollutant is deduced,in which the adsorption and desorption actions are expressed by dynamic sediment absorption mode based on experimental result. The validity of this model is verified by the water quality and hydraulic observation data of the Three Gorges Reservoir. The result shows that this model can be used to simulate the interchange of pollutant in the process of erosion and deposition and reflects the dynamic influence of sediment absorption effect on water environment.