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本文在某待建滨海核电厂址现场野外实验基础上提出了计算该核电厂年均大气扩散因子的计算模型。此模型既考虑了向岸流与离岸流的差别，又考虑了混合层与热内边界层、混合释放与扩散参数随陆距变化等因素的综合影响。模型中所需要的各类参数，包括在１９９５、１９９６年间在该厂址野外大气试验中获取的百米气象铁塔４ 个不同高度上的风、温逐时三维联合频率；湍流测量结合风洞模拟实验获取的离岸流与向岸流的扩散参数；在三个位置上冬、夏两期低空风、温测量获取的海陆风及热内边界层的有关参数。对本模式与目前常用的导则推荐模式的计算结果作了比较。结果表明，目前常用模式因未考虑热内边界层影响等因素而低估了年均扩散因子，对于最关注的向岸流最大年均扩散因子低估约１ 倍左右。
Based on the field experiment of a pending nuclear power station in Binhai, this paper presents a calculation model for calculating the annual average atmospheric diffusion factor of the nuclear power plant. The model not only considers the difference between the coast flow and the offshore flow, but also takes into account the combined effects of mixing layer and thermal inner boundary layer, mixing release and diffusion parameters with the variation of the land distance. The various parameters required in the model include the winds and temperatures at four different heights of the 100-meter meteorological tower acquired during the field atmospheric tests conducted at the site between 1995 and 1996. The turbulence measurements combined with the wind tunnel simulation And the diffusive parameters of the offshore and shoreline flows. The three parameters were the sea-land breeze and the thermal-internal boundary layer acquired by the low-level wind and temperature measurements in winter and summer at three locations. This model is compared with the calculation results of the currently recommended guideline recommendation mode. The results show that the commonly used model underestimates the annual average diffusion coefficient without considering the influence of the thermal inner boundary layer and underestimates about the maximum annual mean diffusion coefficient of the most frequent current.