Dispersion of Multi-outfalls into the Coastal Waters

本文将污水在潮汐沃茨中的扩散问题分为两个不同的问题i.e.one污水排放口附近，污水的动量占主导地位（近场问题），另一个是在远离排放口的地方，环境流和湍流是扩散的主导因素（远场问题）。在这种解决方案中，速度分布和密度分布被假定为采取类似的形状和基本方程减少到一组常微分方程。还解决了将流出物与振荡潮汐流平行地排放的情况。采用应力代数湍流模型求解该问题，针对远场问题，建立了三维潮流/风驱动流场及扩散计算方案，并将其应用于渤海和大连湾的潮流/风驱动流场。模拟结果显示了潮汐环流、水交换和污染物扩散等过程。并将相似的模型应用于杭州湾，成功地模拟了杭州湾的潮流场

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