海岸热边界层熏烟模式的应用研究

Application and Resoearch on Fumigation Modeling in Coastal Thermal Boundary Layer

在海风和陆地热边界层条件下,水陆边界处高架点源可能发生熏烟污染,通常可以应用熏烟扩散模式进行模拟。但是,常用熏烟模式中假设烟流进入边界层内后立即在垂直方向均匀分布,导致算出不合理的高浓度区。假设烟流进入边界层后,主要受到因为大气稳定度变化扩散条件因此变化的影响,改进了计算公式。把原有模式和改进模式分别应用于某滨海区的一个电厂高架点源,结果表明,改进后模式的计算结果更加合理。因此建议类似工作采用改进后的模式。

When wind comes from the water body and a thermal boundary layer does exist at a land-water area, an elevated point source there might generate heavy pollution due to fumigation, It can conventionally be modeled with the fumigation model developed by Lyons and Cole[1]. However, the model assumes an immediate vertical mixing after the plume enters the boundary layer which often leads to a unreasonable high concentration. This paper assumes that the plume undergoes rather a change in diffusion parameters because of the change in atmospheric stability, so as to improve the calculation formula. Both the original and modified models are applied to a point source of a potential power plant located in a bay near East China Sea. The results show that the modified model produces more reasonable calculations. It is suggested that the modified model be applied to other similar studies.