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Aerodynamic scaling for estimating the mean height of dense canopies

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Title: Aerodynamic scaling for estimating the mean height of dense canopies
Authors: Nakai, Taro Browse this author
Sumida, Akihiro Browse this author →KAKEN DB
Matsumoto, Kazuho Browse this author
Daikoku, Ken'ichi Browse this author
Iida, Shin'ichi Browse this author
Park, Hotaek Browse this author
Miyahara, Mie Browse this author
Kodama, Yuji Browse this author →KAKEN DB
Kononov, Alexander V. Browse this author
Maximov, Trofim C. Browse this author
Yabuki, Hironori Browse this author
Hara, Toshihiko Browse this author
Ohta, Takeshi Browse this author
Keywords: Aerodynamic canopy height
Canopy structure
Roughness length
Zero-plane displacement
Issue Date: Sep-2008
Publisher: Springer Netherlands
Journal Title: Boundary-Layer Meteorology
Volume: 128
Issue: 3
Start Page: 423
End Page: 443
Publisher DOI: 10.1007/s10546-008-9299-5
Abstract: We used an aerodynamic method to objectively determine the representative canopy height, using standard meteorological measurements. The canopy height may change if the tree height is used to represent the actual canopy, but little work to date has focused on creating a standard for determining the representative canopy height. Here we propose the ‘aerodynamic canopy height’ ha as the most effective means of resolving the representative canopy height for all forests. We determined ha by simple linear regression between zero-plane displacement d and roughness length z0, without the need for stand inventory data. The applicability of ha was confirmed in five different forests, including a forest with a complex canopy structure. Comparison with stand inventory data showed that ha was almost equivalent to the representative height of trees composing the crown surface if the forest had a simple structure, or to the representative height of taller trees composing the upper canopy in forests with a complex canopy structure. The linear relationship between d and z0 was explained by assuming that the logarithmic wind profile above the canopy and the exponential wind profile within the canopy were continuous and smooth at canopy height. This was supported by observations, which showed that ha was essentially the same as the height defined by the inflection point of the vertical profile of wind speed. The applicability of ha was also verified using data from several previous studies.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中井 太郎

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