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Lookup NU author(s): Dr James Bathurst
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A field method for measuring the flow drag force on individual boulders on a riverbed is identified and tested. Drag is determined from the momentum deficit in the boulder wake, obtained by measuring the flow velocity in a traverse across the wake. A field test yielded a mean drag coefficient of 0.36, which is low compared with flume measurements of 1.1-1.5 for cubes. This may be the result of higher velocity water near the riverbed being sucked into and reenergizing the wake. Further tests are needed to define the conditions in which the method can be used and to indicate how well the assumptions behind the method can be accommodated in a natural flow environment.
Author(s): Bathurst JC
Publication type: Article
Publication status: Published
Journal: Journal of Hydraulic Engineering
Year: 1996
Volume: 122
Issue: 3
Pages: 167-169
Print publication date: 01/03/1996
ISSN (print): 0733-9429
ISSN (electronic): 1943-7900
URL: http://dx.doi.org/10.1061/(ASCE)0733-9429(1996)122:3(167)
DOI: 10.1061/(ASCE)0733-9429(1996)122:3(167)
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