四日市地域における過去の硫黄酸化物の一般座標系を用いた拡散シミュレーション分析

• 武本 行正

  四日市大学環境情報学部

• 北畠 正義

  四日市大学環境情報学部

• 千葉 賢

  四日市大学環境情報学部

書誌事項

タイトル別名

• Diffusion Simulation for Concentration Distribution Analysis of Sulphur Dioxide from Discharged Smoke in Yokkaichi Area in the Past using Generalized Coordinates System

抄録

The purpose of this paper is to present the flow field with diffusion processes of air pollutant in a three dimensional numerical model. The previous model calculates a three dimensional wind field by using the mass consistent model that computes a total wind field from observed wind data on the ground at several observatory sites. Therefore, that model doesn't calculate the three dimensional momentum equations, and it approximates the wind velocities in each mesh point using the variational principle.Then, it causes the reduction of total computational CPU time in wind field computations. But, the previous model adopted the Cartesian Coordinates. so it has no good resolution of the topography for height data of the ground. In the present model of the Generalized Coordinates, the regular mesh system of the u, v and w flow field variables location is employed in order to cancel the truncation errors and to increase the resolution of the topography. This model strictly achieves numerical simulation of air flow, so we first determined the three-dimensional wind field of the entire Yokkaichi area from observatory wind velocity and direction data. Once the wind velocities in each computing mesh are obtained, next atmospheric diffusion and dispersion processes are computed by the convection diffusion equation. Using this method, we can trace the advection diffusion processes of diffused substances in the form of time development by the box model of finite-difference calculus. In this paper, the results of the real situation for sulphur dioxide diffusion processes from discharged smoke of petrochemical companies in Yokkaichi area in the past (in 1975) are shown. Computational results trend to agree well with real observed data in year averaged concentration analysis of sulphur dioxide.

収録刊行物

• 四日市大学環境情報論集

  四日市大学環境情報論集 1 (1_2), 51-72, 1998-03-20

  四日市大学

詳細情報

• CRID: 1390564227352451328
• NII論文ID: 110000587479
• DOI: 10.24584/jeiyu.1.1_2_51
• ISSN: 24334669
• ISSN: 13444883
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可