A stochastic model of emission expansion for an urban road

Proceedings of VNIS'94 - 1994 Vehicle Navigation and Information Systems Conference Pub Date : 1994-08-31 DOI:10.1109/VNIS.1994.396812

M. Karim, H. Matsui

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引用次数: 4

Abstract

On urban roads, vehicles continuously emit gases and through diffusion, vehicle turbulence, heat flux and by wind the emission can transfer to the upper stratosphere and to the road surroundings. There will be some pollutant that can not transfer instantaneously due to wind velocity or road canyons. For a certain time there will be some pollutant in the road surroundings. This paper formulates a stochastic model of this quantity of gas, and the concentration of expanded gases in any particular area around the road in any time period. More precisely, the paper deals with the effects of street canyons on the dispersion of pollutants from the road environment. A mathematical model has been established to figure out the real situation of pollutants in urban roads. The model consists of traffic flow, emission and dispersion models, and wind speed modeling near the road. The principal part of the model predicts the total pollutant concentration near the ground which includes direct vehicle emissions, pollutants which have not transferred and pollutants coming from the surroundings. The prediction was performed using a bivariate normal probability density function. The variables are concentration of pollutants and wind speed. The pollutant included in this model is nitrogen oxides (NO/sub x/).<>

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城市道路排放扩展的随机模型

在城市道路上，车辆不断排放气体，并通过扩散、车辆湍流、热通量和风将排放气体转移到平流层上层和道路周围。由于风速或道路峡谷的影响，会有一些污染物不能瞬间转移。在一段时间内，道路周围会有一些污染物。本文建立了该气体量的随机模型，以及道路周围任何特定区域在任何时间段内膨胀气体的浓度。更确切地说，本文讨论了街道峡谷对道路环境中污染物扩散的影响。建立了一个数学模型，以反映城市道路中污染物的真实情况。该模型包括交通流模型、排放和扩散模型以及道路附近的风速模型。模型的主体部分预测了近地面污染物的总浓度，其中包括车辆直接排放的污染物、未转移的污染物和来自周围环境的污染物。使用二元正态概率密度函数进行预测。变量是污染物浓度和风速。该模型中包含的污染物是氮氧化物(NO/sub x/)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of VNIS'94 - 1994 Vehicle Navigation and Information Systems Conference

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