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The structure of canopy flow field

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dc.contributor.authorKawatani, Takeshi, author
dc.contributor.authorMeroney, Robert N., author
dc.contributor.authorFluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
dc.date.accessioned2019-09-17T19:45:30Z
dc.date.available2019-09-17T19:45:30Z
dc.date.issued1968-08
dc.descriptionCER67-68TK66.
dc.descriptionAugust 1968.
dc.descriptionIncludes bibliographical references (pages 41-43).
dc.descriptionPrepared under U.S. Army Research Grant DA-AMC-28-043-65-G20.
dc.description.abstractA model study of canopy flow over high roughness elements was carried out in the Army Meteorological Wind Tunnel at Colorado State University using roughness consisting of pegs 9 cm high and 0.48 cm in diameter arranged in four patterns. The mean velocity and the turbulence intensity were measured within and above the roughness elements. Empirical expressions derived from field measurements for mean velocity profiles, turbulent velocity, and turbulence intensity were used to examine the data obtained in this model study. The logarithmic profile was adapted to analyze the data of mean velocity above the canopy. In this analysis, the friction velocity and the roughness parameter were calculated from the mean velocity profiles and related to the density of roughness elements to show the effects of roughness density on the flow field. The growth of the internal boundary layer was estimated from the mean velocity profiles and the turbulence intensity. The results of estimation were compared with semi-empirical equations. Although the coefficient of anisotropy above the canopy in this model study is larger than that in the field, the model study gave data about the turbulent flow field similar to the field data. Hence, this model was verified to be suitable for the study of diffusion.
dc.description.sponsorshipUnder grant DA-AMC-28-043-65-G20.
dc.format.mediumtechnical reports
dc.identifier.urihttps://hdl.handle.net/10217/198129
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991012735579703361
dc.relation.ispartofCivil Engineering Reports
dc.relation.ispartofCER, 67/68-66
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subject.lcshMicrometeorology
dc.titleThe structure of canopy flow field
dc.typeText
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