森林キャノピー粗度層における顕熱輸送渦の鉛直長さスケール

DOI 日本農学文献記事索引 Web Site Web Site 参考文献67件

書誌事項

タイトル別名
  • Vertical Length Scale of Transporting Eddies for Sensible Heat in the Unstable Roughness Sublayer Over a Forest Canopy

この論文をさがす

説明

This study investigated the vertical length scales of transporting eddies calculated from multi-level turbulence measurement in the unstable roughness sublayer over a flat pine forest by using the surface renewal method as a description of heat transport. It was observed that the vertical integral scale exhibited a increasing tendency with thermal instability, whereas the shear length scale of Raupach et al. (1996, Boundary-Layer Meteorol., 78, 351-382) was relatively stability-insensitive. These length scales were used as the height of the transporting eddies in the surface renewal method in order to examine the relevance of the length scales to the turbulent transfer. Comparisons with the eddy covariance measurement showed that variation in the performances of the surface renewal method with the different length scales was most noticeable under unstable conditions; the use of the vertical integral scale leads to better accuracy in flux computation. The results indicated the validity of the vertical integral scale as a direct measure of the transporting eddy scale in the surface renewal context. It was also suggested that the shear length scale may have limitations in terms of describing the vertical scale of the eddies in the unstable roughness sublayer when the buoyancy has a considerable effect on turbulence production.

収録刊行物

  • 農業気象

    農業気象 65 (1), 1-9, 2009

    日本農業気象学会

参考文献 (67)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ