ストリートキャニオン内部の大気汚染物質拡散に対する道路幅および大気安定度の影響に関する風洞実験 : 市街地における汚染物の拡散に関する実験的研究その5

概要

論文の詳細を見る
Results of wind tunnel experiments on the influence of road width and thermal stratification on the concentration field in urban street canyons are presented. 1) Concentration distribution changes greatly with the line-source position. The differences due to the source position become larger with increasing road width. 2) Air pollutants released on the windward side in the street canyon are likely to stagnate while those released on the leeward side are likely to be discharged outside the street canyon. 3) The increase in average concentration within the street canyon in stable stratification conditions becomes large with increasing road width. 4) The airiness factor--A_<ST>: (QO_<ST> (rate of ventilation)) / (L(width of the street canyon) x・U_H(wind speed at building height, H)) decreases from 0.2 (L/H = 0.5) to 0.1 (L/H = 2) and remains almost constant (A_<ST> = 0.1) at L/H = 2 to 6 under neutral stratification conditions. 5) Concentrations estimated using a newly proposed street canyon model agree with the results from wind tunnel experiments, except in extremely strong stable stratification and in wide roads (L/H = 6).
社団法人日本建築学会の論文
1999-10-30