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Visualization of seawater flow around morphologically distinct forms of the giant kelp Macrocystis integrifolia from wave-sheltered and exposed sites
Citation
Hurd, CL and Stevens, CL and Laval, BE and Lawrence, GA and Harrison, PJ, Visualization of seawater flow around morphologically distinct forms of the giant kelp Macrocystis integrifolia from wave-sheltered and exposed sites, Limnology and Oceanography, 42, (1) pp. 156-163. ISSN 0024-3590 (1997) [Refereed Article]
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Copyright Statement
Copyright 1997 by the American Society of Limnology and Oceanography, Inc.
DOI: doi:10.4319/lo.1997.42.1.0156
Abstract
Our objective was to determine whether blades of Macrocystis integrifolia from a wave-sheltered site possess
morphological features that "trip" velocity boundary layers (VBL) from laminar to turbulent in conditions of low
water motion, compared to blades from a wave-exposed site. The movement of seawater around morphologically
distinct blades of M. integrifolia from wave-sheltered and exposed sites was visualized in a recirculating flow tank
in which seawater flow was initially laminar at velocities up to 8 cm s-1. Turbulent VBLs were observed for both
blade morphologies at free-stream seawater velocities of 2 cm s-1, and at a Reynolds numbers of between 102 and
104, which is lower than that predicted from boundary layer theory. Flaw around blades from a wave-sheltered site
was dominated by separation induced by large edge undulations. For the wave-exposed morphology, the flow pattern
was similar to that along a smooth, flat plate, but the observed thickness of the VBL was up to a factor of 2 greater
than that predicted from laminar or turbulent boundary layer theory. There were no obvious differences in how
structural features such as marginal spines and bulbs affected seawater flow around the different blade morphologies.
Item Details
Item Type: | Refereed Article |
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Keywords: | seaweed, hydrodynamics, flow visualisation |
Research Division: | Biological Sciences |
Research Group: | Plant biology |
Research Field: | Phycology (incl. marine grasses) |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the biological sciences |
UTAS Author: | Hurd, CL (Professor Catriona Hurd) |
ID Code: | 93162 |
Year Published: | 1997 |
Web of Science® Times Cited: | 40 |
Deposited By: | IMAS Research and Education Centre |
Deposited On: | 2014-07-14 |
Last Modified: | 2014-08-04 |
Downloads: | 427 View Download Statistics |
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