泥沙污染水质模型研究

Research on Sediment Pollution Water Quality Model

多数污染物的迁移转化与泥沙和泥沙运动关系紧密,将水相和悬浮相污染作为一个整体,结合泥沙模型,引入泥沙污染物吸附量,底泥释放量及冲淤引起的释放增量等物理量,推导建立了泥沙污染水质模型,并运用吸附动力学,孔隙水扩散等模型,解决了泥沙吸附量和底泥的释放随时空变化的问题。模型较完整地考虑了泥沙输移、底泥冲刷及释放等过程对水质的影响。应用于汉阳四湖调水工程中,结果表明模型精度较高,能体现泥沙对水质的影响。

Most pollutant's transportation is closely related to sediment and its transportation. Considering aqueous phase and particle phase pollutants as a whole and combining the sediment model, a sediment pollution water quality model is established. In the derivation of the model, sediment pollutant absorptive capacity, pollutant release rate from bed mud, and its incremental rate because of sediment erosion were inducted, and by using absorption kinetics, pore water diffusion model and so on, the problem of sediment pollutant absorptive capacity and pollutant release rate from bed mud variation with temporal and spatial is solved. The model can reflect the influence of sediment transportation, bed mud erosion, pollutant release from the bed and processes on the water quality. As applied in the water quality simulation of Hanyang Four Lakes' water diversion work, the result shows that it has high precision, and it can embody the influence of sediment.