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Title: 中立に近い大気境界層における組織的乱流構造の出現状況の変化
Other Titles: Variation in Emergence Properties of Coherent Turbulence Structures in the Near-Neutral Atmospheric Boundary Layer
Authors: 堀口, 光章  kyouindb  KAKEN_id
林, 泰一  KAKEN_name
足立, アホロ  KAKEN_name
小野木, 茂  KAKEN_name
Author's alias: HORIGUCHI, Mitsuaki
HAYASHI, Taiichi
ONOGI, Shigeru
Keywords: 大気境界層
atmospheric boundary layer
meteorological tower
turbulence structure
Issue Date: 30-Sep-2012
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B
Volume: 55
Issue: B
Start page: 289
End page: 297
Abstract: 大気境界層における組織的な乱流構造について,つくば市気象研究所気象観測鉄塔(高さ213m)での乱流観測データを使用し,安定度が中立に近い状態でのその出現状況の変化を調べた。ウェイブレット分散スペクトルにより,中立に近い状態で,ほぼ中立と言えるような条件の場合と不安定寄りの場合に大きな規模の乱流構造が顕著に出現することが示された。強風の乱流構造の前方に位置する弱風域は中立に近い状態でも不安定寄りの場合に正の温度偏差を示し,大気下層が熱せられ浮力により生じるプリュームの構造に良く似ている。
Variation in emergence properties of coherent turbulence structures in the near-neutral atmospheric boundary layer is investigated on the basis of the turbulence data observed from a 213-m tall meteorological tower at the Meteorological Research Institute in Tsukuba City. Under near-neutral conditions, large-scale turbulence structures are notably identified from the wavelet variance spectra in almost neutral or slightly unstable conditions. In near-neutral and slightly unstable conditions, the low-speed region in advance of the high-speed structure shows a positive deviation of temperature and is similar to the plume structure that is forced by buoyancy in the heated lower layer.
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