潮汐河流溶解氧数学模型的探讨

本文根据河流一维水质对流扩散方程和潮汐河流的特征,建立了潮汐河流潮变溶解氧数学模型.该模型考虑了有机污染物质的碳化和硝化耗氧过程,通过模拟实测的溶解氧,确定了由流速和水深表达的复氧系数公式中的有关参数.计算值与实测值的比较结果表明,本模型能较好地模拟黄浦江潮汐过程中溶解氧的时空变化过程,对进一步探讨潮汐河流的水质变化规律有一定的参考价值.

Mathematical Modeling of Dissolved Oxygen in Tidal Rivers

Based on the one-dimensional mass-transfer equation of rivers and the characteristics of tidal rivers, a nonsteady state dissolved oxygen(Do) model for the tidal river is developed. The effects of carbonaceous BOD (CBOD) and nitrogenous BOD(NBOD) for organic pollutants on disssolved oxygen level are considerd in the model. The parameters in the equation of reaeration coefficient expressed by tidal velocities and flow depths are determined based on the numerical modeling of DO in the Huangpu River. The comparison of measured and calculated data shows that the model predicts satisfactorily DO profiles with time and space in the tidal processes of the Huangpu River.