Atmospheric Pollution 1980, Proceedings of the 14th by Michel M. Benarie (Eds.)

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By Michel M. Benarie (Eds.)

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The average emission rate over the pathway segment is the sum of the components due to uncongested (Q) and congested (Q') flow, as given by: where E' corresponds to an average route speed of 20 mi/h, i is the number of vehicles affected by the backup, L = segment length (m), Lq = backup length (m), and + is the duration (seconds) of the backup. Travel on arterials within the CBD is characterized by interrupted flow and low speeds, and a modal emissions treatment should be used. This is available through an adaptation of EPA's modal model.

The formulation of the equations is outlined as is the numerical finite-difference procedure for solving them. €n particular APT can allowwind speed, surface roughness and heat flux to change as a function of distance downwind and carries no restriction on the initial source height. The code also contains pro- vision for simulating deposition via a source depletion model, but this aspect will not be described in the present paper. An example of these capabilities is given in the form of a prediction of the release of a plume into a stably-stratified atmosphere over open countryside and its subsequent behaviour as it crosses increasingly rougher and hotter surburban, and then urban, terrain.

K . P e t e r s , Proc. 4th Symp. Turbulence, Diffusion, Air P o l l u t i o n , Reno, Nevada, January, 1979, Amer. Meteor. SOC. R. Carmichael, T. Kitada and L . K . P e t e r s , Comp. and Fluids, (1980) in press. C. Y. Yang, S u l f u r dioxide photooxidation r a t e s and aerosol format i o n mechanisms: A smog chamber study. , PB-260-910, 1976. W. B r a d s t r e e t , 66th Ann. APCA Meeting, Chicago, IL, June, 1973. R. D. D i s s . , Univ. of K Y , 1979. O. J. Ranzieri, A c o n s i s t e n t scheme f o r estimating d i f f u s i v i t i e s t o be used i n a i r q u a l i t y models, PB-272-484, 1976.

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