Title: A model for simulating atmospheric dispersion in low-wind conditions

Authors: S. Okamoto, H. Ohnishi, T. Yamada, T. Mikami, S. Momose, H. Shinji, T. Itohiya

Addresses: Tokyo University of Information Sciences, 1200-2 Yatoh-cho, Wakaba-ku Chiba 2658501, Japan. Public Works Research Institute, Ministry of Construction, 1 Asahi, Tsukuba, 3050804, Japan. Public Works Research Institute, Ministry of Construction, 1 Asahi, Tsukuba, 3050804, Japan. Environmental Technical Laboratory Ltd., Kohoku 2-11-17 Adachi, Tokyo, 1230872, Japan. Environmental Technical Laboratory Ltd., Kohoku 2-11-17 Adachi, Tokyo, 1230872, Japan. Environmental Technical Laboratory Ltd., Kohoku 2-11-17 Adachi, Tokyo, 1230872, Japan. Highway Environment Research Institute, 2-7-4 Hirakawa-cho, Chiyoda-ku, Tokyo 1020093, Japan

Abstract: A practical model for low-wind conditions was derived by integration of an instantaneous three-dimensional Gaussian puff equation, in which wind speed was assumed to be zero and standard deviations of a smoke (σ_y and σ_z) were expressed as a linear function of the dispersion time. When the plume spreads σ_y and σ_z were assumed to be linear functions of dispersion time, the proportionality coefficients for σ_y and σ_z) derived from the air tracer experiments were about 0.30-0.40 and 0.09-0.18 m/s, respectively.

Keywords: calm condition; dispersion coefficient; dispersion model; low wind speed.

DOI: 10.1504/IJEP.2001.000607

International Journal of Environment and Pollution, 2001 Vol.16 No.1/2/3/4/5/6, pp.69-79

Published online: 07 Jul 2003 *

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