随机游动模型在大气污染扩散分析中的应用探讨  

Practical discussion on the random floating model with the atmospheric pollutant dispersion

作　　者：金陶胜[1] 杨锦[1] 韩素芹[1] 葛卫华[2] 

机构地区：[1]南开大学环境科学与工程学院,天津300071 [2]解放军防化指挥工程学院,北京102205

出　　处：《安全与环境学报》2008年第1期73-75,共3页Journal of Safety and Environment

基　　金：天津市科技支撑计划重点项目(07ZCGYSF03200);南开大学创新基金项目(Z1A2006009)

摘　　要：应用随机游动扩散模拟方法,并结合天津市的实际气象数据,对某区域的大气污染扩散情况进行了模拟计算。由模拟过程和结果可以看出,相比于高斯模型等其他常用方法而言,随机游动扩散模拟适用的范围较广,可用于瞬时以及非均匀的浓度扩散分布状况,也能够不受污染物质的特性所限制(气态物和重粒子都可进行模拟)。模拟结果对有关部门的污染防护与事故处理有一定的参考意义。This paper is aimed at introducing its authors＇ discussion on the Random Walk Model to simulate the regional atmospheric pollutant dispersions in Tianjin municipality sphere. First of all, we have collected and studied the stochastic data with normal distribution generated by applying the mixed congruent method in stochastic theory. Then, we have worked out the fluctuated velocities of particles at particular time and space characteristic of turbulent dispersion based on the said stochastic and other meteorological and topographical data. Thirdly, the moving velocities of the particles could be tested by combining the fluctuated velocities of particles and the wind velocities of some areas of Tianjin. Through the moving velocities of the particles and the time steps, random distances of particles at every occasion couid be worked out. And, finally, when the random distances of particles in every occasion were determined, instantaneous and integral concentrations of pollutant particles in each well-defined spatial grid could be found by means of some related equations. The results of our research have shown that the simulated integral concentrations were non-equal spatial distribution, compared to some other models based on normal distribution, which would be closer to the actually. Moreover, random floating model could be used for testing many other kinds of pollutants, no matter whether they are gaseous, particles or aerosols. In conclusion, the simulations of Random Walk Model prove to be theoretically rational and credible, which can be made beneficial to environmental protection and emergency disposal of related areas.

关 键 词：环境科学 随机游动 大气污染 扩散模型 

分 类 号：X1[环境科学与工程—环境科学]