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Title: 中立に近い安定度における大気境界層乱流の構造 : 潮岬と信楽における観測
Other Titles: Structures of Turbulence in Nearly Neutral Planetary Boundary Layer-Observations at Shionomisaki and Shigaraki-
Authors: 堀口, 光章  kyouindb  KAKEN_id
林, 泰一  KAKEN_id
植田, 洋匡  KAKEN_name
Author's alias: HORIGUCHI, Mitsuaki
HAYASHI, Taiichi
UEDA, Hiromasa
Keywords: 大気境界層
planetary boundary layer
coherent structure
momentum transfer
Doppler sodar
Issue Date: 1-Apr-2005
Publisher: 京都大学防災研究所 / Disaster Prevention Research Institute Kyoto University
Journal title: 京都大学防災研究所年報. B = Disaster Prevention Research Institute annuals. B
Volume: 48
Issue: B
Start page: 515
End page: 521
Abstract: 中立に近い安定度の大気境界層における乱流の構造を潮岬風力実験所と信楽MU観測所において観測した結果を解析した。時間スケール200 秒程度の比較的大きな強風域の構造による運動量輸送への寄与は平均値に比べて2倍程度まで大きい。地表近くでの運動量輸送への寄与は100 秒程度のスケールの乱流変動によるものが大きく,また,イジェクション(低速流の上昇運動)よりもスウィープ(高速流の下降運動)の乱流運動による運動量輸送の方がやや寄与が大きい場合が見られる。そして,これらのことと強風域の構造との関連が示唆される。
Turbulent structures in the nearly neutral planetary boundary layer observed at Shionomisaki Wind Effect Laboratory and Shigaraki MU Observatory is analyzed. Structures of high wind speed with larger time scale (about 200s.) make large contribution to momentum transfer which is up to about 2 times of average values. Near the surface large contribution to momentum transfer by turbulent fluctuations with time scale of about 100s. Is shown. The sweep turbulent motion (downward high speed motion) may dominate the ejection motion (upward low speed motion) for the momentum transfer. Some relation of these results to the structures of high wind speed is suggested.
Appears in Collections:No.48 B

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