【摘要】 采用拉格朗日随机粒子扩散模式和三维风场诊断模式以及实际气象观测资料,模拟分析了福建惠安核电厂所在沿海地区的大气流动和气载污染物的中尺度扩散情况。结果表明:①该区域低层大气的流动决定于各季盛行风背景、天气系统和局地海陆-山谷风环流系统的共同作用。②冬、春、秋季区域中尺度扩散总体沿西南海岸或偏西内陆方向,夏季总体沿东北海岸线方向进行。局地中尺度环流带来的向岸流和离岸流对具体扩散形态有重要影响。③污染物扩散输送出模拟区域的平均去除时间约为18～21h。污染物在200km×200km模拟区域内滞留24h以上的情况在各季分别可占1 4～1 3。更多还原

【Abstract】 A Lagrangian stochastic model and a three-dimensional wind field diagnostic model are used to reveal the characteristics of meso-scale atmospheric flow and diffusion over Huian area, Fujian province. Practical meteorological data are used in this study and the emission correspondent to a source located at the address of Huian nuclear power station is simulated. Main results obtained are as follows: ① Lower atmospheric flows in this area are determined by prevailing background wind, synoptic system, as well as locally specific land-sea and terrain circulation. ② A southwesterly diffusion pattern along the coast or a westerly pattern toward inland is presented for winter, autumn and spring in this area, while a northeastward pattern for summer. The on-shore and off-shore components of local circulation contribute to diffusion patterns.③ The mean time spent to transport air pollutants out of the model domain is 18～21 h, approximately. And 1/4 to 1/3 portion of time in respective seasons may have the air pollutants emitted from the source staying in the domain of 200　km×200　km for more than 24 h.更多还原