論文

査読有り
2013年10月

Spatial evolution of coherent motions in finite-length vegetation patch flow

ENVIRONMENTAL FLUID MECHANICS, Springer
  • Taka-aki Okamoto
  • ,
  • Iehisa Nezu

13
5
開始ページ
417
終了ページ
434
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1007/s10652-013-9275-6
出版者・発行元
SPRINGER

A number of experimental studies on submerged canopy flows have focused on fully-developed flow and turbulent characteristics. In many natural rivers, however, aquatic vegetation occurs in patches of finite length. In such vegetated flows, the shear layer is not formed at the upstream edge of the vegetation patch and coherent motions develop downstream. Therefore, more work is neededz to reveal the development process for large-scale coherent structures within vegetation patches. For this work, we considered the effect of a limited length vegetation patch. Turbulence measurements were intensively conducted in open-channel flows with submerged vegetation using Particle Image Velocimetry (PIV). To examine the transition from boundary-layer flow upstream of the vegetation patch to a mixing-layer-type flow within the patch, velocity profiles were measured at 33 positions in a longitudinal direction. A phenomenological model for the development process in the vegetation flow was developed. The model decomposed the entire flow region into four zones. The four zones are the following: (i) the smooth bed zone, (ii) the diverging flow zone, (iii) the developing zone and (iv) the fully-developed zone. The PIV data also confirmed the efficiency of the mixing-layer analogy and provided insight into the spatial evolution of coherent motions.

リンク情報
DOI
https://doi.org/10.1007/s10652-013-9275-6
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000324275700001&DestApp=WOS_CPL
ID情報
  • DOI : 10.1007/s10652-013-9275-6
  • ISSN : 1567-7419
  • Web of Science ID : WOS:000324275700001

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