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A laboratory study on the drag force distribution within model forest canopies in turbulent shear flow

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dc.contributor.authorHsi, George, author
dc.contributor.authorNath, John H., author
dc.contributor.authorCollege of Engineering, Colorado State University, publisher
dc.date.accessioned2019-09-17T19:45:28Z
dc.date.available2019-09-17T19:45:28Z
dc.date.issued1968-03
dc.descriptionCER67-68GH-JHN50.
dc.descriptionMarch 1968.
dc.descriptionIncludes bibliographical references (page 20).
dc.descriptionPrepared under U.S. Army Research Grant DA-AMC-28-043-65-G20 U.S. Army Material Command Washington 25, D.C.
dc.description.abstractThe objective of this study was to determine the distribution of the tree drag force within various model forest canopies subjected to various ambient wind conditions. Ultimately this information may be related to diffusion within the forest canopy. The influence on individual tree drag due to neighboring trees was investigated by arranging the trees in various configurations of columns and rows, the columns being parallel to the ambient wind and the rows being perpendicular. Two tree spacings for the columns and rows were investigated. Furthermore, a large forest canopy field was investigated that covered an area of twenty-one square meters. For this arrangement it was determined that the tree drag field can be classified into two zones - an initial zone and a steady decay zone. In order to study the influence of the boundary layer development on tree drag, the various arrangements of trees were tested under a thin boundary layer condition and under a thick boundary layer condition. In the course of this study a strain gage force dynamometer was developed that can reliably measure a drag force as small as 0.1 gram on a model tree.
dc.description.sponsorshipUnder grant DA-AMC-28-043-65-G20.
dc.format.mediumtechnical reports
dc.identifier.urihttps://hdl.handle.net/10217/198124
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991020709659703361
dc.relation.ispartofCivil Engineering Reports
dc.relation.ispartofCER, 67/68-50
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.lcshDrag (Aerodynamics)
dc.subject.lcshFluid mechanics
dc.subject.lcshBoundary layer control
dc.titleA laboratory study on the drag force distribution within model forest canopies in turbulent shear flow
dc.typeText
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