Nocturnal drainages which flow into the Osaka Plain and their usage as a countermeasure for nocturnal heat-island phenomena

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560664
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Civil and environmental engineering
• Research Institution: Osaka University
• Principal Investigator: TAMAI Masahiro 大阪大学, 工学(系)研究科(研究院), 准教授 (70197557)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 都市ヒートアイランド / 冷気流 / 山風 / 都市大気環境

Outline of Final Research Achievements

The Osaka Plain faces with the Hokusetsu and the Rokko Mounts on the north, with the Ikoma Mounts on the east and with the Izumi Mounts on the south. Mountain winds are supposed to occur on slopes of the mounts and flow into the plain in nighttime. The purpose of the study is to examine whether the mountain winds can be used for a countermeasure for nocturnal heat-island phenomena in the Osaka Plain.
The results indicate that the mountain winds decrease nocturnal air temperature in the foots of the mounts by a few degree and that the winds have velocity profiles quite similar to those of gravity density currents which flow on inclined planes and have vertical thicknesses of several hundred meters and horizontal velocities of several meter per second.

Free Research Field

土木環境システム