Journal
LIMNOLOGY AND OCEANOGRAPHY
Volume 51, Issue 3, Pages 1294-1301Publisher
WILEY
DOI: 10.4319/lo.2006.51.3.1294
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We investigated the effects of the ratio of water depth (H) to coral height (h) on the drag coefficient (C-d) for unidirectional flow over the coral species Porites compressa. C-d measured in a laboratory flume at several different flow rates and depths over a coral canopy, varied from 0 to 1.68 with a clear dependence on H: h. At higher Reynolds numbers C-d was inversely proportional to H: h and showed signs of becoming Re-independent. C-d was dependent on both Re and H: h at lower Reynolds numbers, indicating laminar or transitional flow within the coral canopy. The relationship between C-d and H: h at the highest available Re for each depth ratio is described by the power law: C-d = 1.01(H:h)(-2.77) + 0.01. This result should be applied with caution, however, as different coral species and bottom roughness may cause a deviation from this relationship.
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