针对随机游走模型主要适用于开敞海域而未考虑污染物的粒子触岸问题,对现有随机游走模型进行了改进,按照距离最近规则,对近岸污染颗粒物的迁移轨迹进行修正,建立了改进的随机游走模型. 以东北某大型水库为典型案例,在枯水期主导风向东北风和次主导风向西风两种气象条件,利用改进的模型模拟分析了水库中污染物随时间迁移及其空间分布特征. 结果表明,改进的模型既适用于水库等狭窄水域,又能够形象直观地描述污染物迁移特征.%The Random Walk model is mainly used in the circumstance of open sea area, in which, the case of contaminated particles encountering bank is ignored. In the light of this problem, we improved the existing Random Walk model by correcting the motion track of near-shore contaminated particles according to the principle of shortest distance. In a typical large reservoir in Northeastern China, the simulation of the temporal and spatial motion characteristics of the contaminated particles has been carried out by using the improved model respectively under two dominated wind conditions of northeast wind and west wind in dry season. The simulation results showed that the improved model is applicable to the narrow natural waters such as the reservoirs etc. , which can visually demonstrate the migratory characteristics of contaminated particles in reservoir.
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