关键词: 大气扩散, 随机游走扩散模式, 示踪实验, 地形扰动

Abstract: Diffusion process of tracer experiments on complex seashore of Sanmen in Zhejiang Province of China is simulated by a combined modeling system. This system is composed of the diagnostic wind model Calmet, which provides a high-resolution wind field, and the Lagrangian random-walk dispersion model RPPM which calculates surface concentration distribution for comparison with the field measurement. In each tracer experiment, tracer concentration is measured at sample stations which spread over several arcs so as to capture the main body of the plume. Comparison between surface concentrations generated by the two methods reveals that the modeling system considerably well simulates the trajectory of the plume and distribution of surface concentration.

Key words: atmospheric diffusion, random-walk dispersion model, tracer experiment, topographic perturbation