潮汐河口污染带影响因素研究

介绍潮汐河口污染物混合问题的研究现状,建立了应用贴体坐标和有限体积法求解二维水流水质方程的数学模型,并在此基础上,着重研究了潮汐河口水域水力要素及污染物排放特性与污染带范围的变化规律,得到了该水域水深、比降、纵向及横向混合系数,污染物排放量,污染物排放开始时间及污染物降解系数等因素与污染带范围的定量关系,并对各影响因素进行了灵敏度分析。

Factors affecting the pollution belt at tidal estuaries

Some research results on turbulent mixing of wastewater in tidal current are summarized and analyzed. By use of the fitted coordinate system and FVM, a numerical model is established for solving the 2 D water flow water quality equation. Based on the model, the regularities of the variations of hydraulic factors, the characteristics of pollutant discharge, and the range of the pollution belt are studied for the water area at tidal estuaries. Furthermore, quantitative relationships between the range of the pollution belt and some affecting factors are obtained, the factors including the water depth, water surface gradient, longitudinal and lateral mixing coefficients, amount of pollutant discharge, time when pollutant discharge begins, and pollutant degradation coefficient. A sensitivity analysis is performed for each affecting factor.