九州大学新キャンパス計画推進室 | 九州大学大学院農学研究院生産環境科学部門地域環境科学講座気象環境学研究室
Kyushu University New Campus Planning Office | Laboratory of Applied Meteorology, Division of Regional Environment Science, Department of Bioproduction Environmental Sciences, Kyushu University
九州大学大学院農学研究院生産環境科学部門地域環境科学講座気象環境学研究室
Laboratory of Applied Meteorology, Division of Regional Environment Science, Department of Bioproduction Environmental Sciences, Kyushu University
Making local meteorological observations on the southeastern slope of Mt. Shiouji in Dazaifu on a calm clear night in April, 1993, we examined the actual conditions of cold air drainage and thermal belt on the hillside. After sunset, the cold air layer suddenly appeared and developed, and its thickness was kept being about 20 m through the night. The site where down-slope winds take off the surface was confirmed to be the central part of the thermal belt on the slope. The down-slope wind speed decreased gradually as the night progressed, which seems to be due to the ascent of the surface of the cold air lake that was developing above the foot of the mountain. The relation between the drainage wind speed and the potential temperature deficit in the cold-air-drainage layer can be explained by the equilibrium flow model by Mori et al. (1999).
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