A traversing system to measure bottom boundary layer hydraulic properties

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Title A traversing system to measure bottom boundary layer hydraulic properties
Author Ali, Ayub; Lemckert, Charles James
Journal Name Estuarine, Coastal and Shelf Science
Year Published 2009
Place of publication United Kingdom
Publisher Elsevier
Abstract This study describes a new convenient and robust system developed to measure benthic boundary layer properties, with emphasis placed on the determination of bed shear stress and roughness height distribution within estuarine systems by using velocity measurements. This system consisted of a remotely operated motorised traverser that allowed a single ADV to collect data between 0 and 1 m above the bed. As a case study, we applied the proposed traversing system to investigate bottom boundary layer (BBL) hydraulic properties within Coombabah Creek, Queensland, Australia. Four commonly-employed techniques: (1) Log-Profile (LP); (2) Reynolds stress (RS); (3) Turbulent Kinetic Energy (TKE); and (4) Inertial Dissipation (ID) used to estimate bed shear stresses from velocity measurements were compared. Bed shear stresses estimated with these four methods agreed reasonably well; of these, the LP method was found to be most useful and reliable. Additionally, the LP method permits the calculation of roughness height, which the other three methods do not. An average value of bed shear stress of 0.46 N/m2, roughness height of 4.3 mm, and drag coefficient of 0.0054 were observed within Coombabah Creek. Results are consistent with that reported for several other silty bed estuaries.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.sciencedirect.com/science/journal/02727714
Alternative URI http://dx.doi.org/10.1016/j.ecss.2009.04.017
Copyright Statement Copyright 2009 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 83
Issue Number 4
Page from 425
Page to 433
ISSN 0272-7714
Date Accessioned 2009-07-23
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Physical Oceanography
URI http://hdl.handle.net/10072/25989
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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