Dispersion of Multi-outfalls into the Coastal Waters

本研究将水流扩散问题处理为两个不同的问题，一是在排污口附近，水流动量占主导地位的问题(近场问题)；二是远离排水口附近的扩散问题(远场问题)，其中环境流动和湍流是扩散的主要因素。在此解中，假设速度分布和密度分布具有相似的形状，并将基本方程归结为一组常微分方程组。还解决了污水垂直于振荡潮流排出的情况。该问题采用应力代数湍流模型进行求解，针对远场问题，开发了三维潮流/风生流动和弥散计算格式，并将其应用于渤海和大连湾，以显示潮流和风生流动。结果显示了潮汐环流、水体交换和污染物扩散情况。将类似的模型应用于汉州湾，成功地模拟了潮汐运动。

This study treats the problem of effluent dispersion into the tidal waters as two different problems, i.e.one around the effluent outfalls where the momentum of the effluent is dominant(near field problem)and the other far away from the outfalls where the ambient flow and turbulence is dominant factor in dispersion (far field problem).For the near field problem, the buoyant jet flow is solved for wide range of parameters and non-homogeneous and non-uniformly flowing ambient environment. In this solution, the velocity profile and the density profile are assumed to take a similar shape and the fundamental equations are reduced to a set of the ordinary differential equations. Also solved is the case where the effluent is discharged perpendicularily to the oscillating tidal flow.. This problem is solved with the stress algebraic turbulence model.For the far field problem, the three-dimensional tidal/wind-driven flow and dispersion calculation scheme is developed and applied to the Bohai Sea and the Dalian Bay to show the tidal and wind-driven flow. The result shows the tidal circulation, water exchange and pollutant dispersion. Also a similar model is applied to Hanzhou Bay to successfully reproduce the tidal flow