前言有许多横断面趋向完全混和的河口,其组分浓度垂向和横向的变化很小,以致可以忽略不计。在这种河口中,水的混和与运动可用一元来处理,而用二元或三元混和系统的模型不可能得到更多的信息。水质模型的预测能力取决于河口环境对污染物散布开去进而使其浓度降低的能力的一个重要参数。看来现有的分散系数方程不能代表潮汐河口,用这些方程实际计算出的分散量很小,可 INTRODUCTION There are many estuaries that tend to be completely mixed in cross-section and have negligible vertical and lateral component concentrations. In this estuary, mixing and movement of water can be handled in a dollar, whereas it is impossible to get more information with models of binary or ternary mixing systems. The predictive power of a water quality model depends on the importance of the estuary’s ability to disperse pollutants and reduce their concentration. It appears that the existing dispersion coefficient equations do not represent the tidal estuary, and the actual dispersion calculated using these equations is small.