Wave-generated flow on coral reefs - an analysis for two-dimensional horizontal reef-tops with steep faces

Gourlay, M. R. and Colleter, G. (2005) Wave-generated flow on coral reefs - an analysis for two-dimensional horizontal reef-tops with steep faces. Coastal Engineering, 52 4: 353-387. doi:10.1016/j.coastaleng.2004.11.007


Author Gourlay, M. R.
Colleter, G.
Title Wave-generated flow on coral reefs - an analysis for two-dimensional horizontal reef-tops with steep faces
Journal name Coastal Engineering   Check publisher's open access policy
ISSN 0378-3839
Publication date 2005
Sub-type Article (original research)
DOI 10.1016/j.coastaleng.2004.11.007
Volume 52
Issue 4
Start page 353
End page 387
Total pages 35
Editor H. F. Burcharth
Place of publication Amsterdam
Publisher Elsevier Science Bv
Collection year 2005
Language eng
Subject C1
770405 Physical and chemical conditions
290899 Civil Engineering not elsewhere classified
0905 Civil Engineering
Abstract Waves breaking on the seaward rim of a coral reef generate a flow of water from the exposed side of the reef to the sheltered side and/or to either channels through the reef-rim or lower sections of the latter. This wave-generated flow is driven by the water surface gradient resulting from the wave set-up created by the breaking waves. This paper reviews previous approaches to modelling wave-generated flows across coral reefs and discusses the influence of reef morphology and roughness upon these flows. Laboratory measurements upon a two-dimensional horizontal reef platform with a steep reef face provide the basis for extending a previous theoretical analysis for wave set-up on a reef in the absence of a flow [Gourlay, M.R., 1996b. Wave set-up on coral reefs. 2. Set-up on reefs with various profiles. Coastal Engineering 28, 1755] to include the interaction between a unidirectional flow and the wave set-up. The laboratory model results are then used to demonstrate that there are two basic reef-top flow regimes-reef-top control and reef-rim control. Using open channel flow theory, analytical relationships are derived for the reef-top current velocity in terms of the offreef wave conditions, the reef-top water depth and the physical characteristics of the reef-top topography. The wave set-up and wave-generated flow relationships are found to predict experimental values with reasonable accuracy in most cases. The analytical relationships are used to investigate wave-generated flows into a boat harbour channel on Heron Reef in the southern Great Barrier Reef. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Engineering, Civil
Engineering, Ocean
Marine Environment
Coral Reefs
Wave Set-up
Wave-generated Flow
Wave-current Interaction
Roughness
Reef Morphology
Open Channel Flow Controls
Heron Island
Great Barrier Reef
Nutrient-uptake Rates
Set-up
Physical Derivation
Roughness
Breaking
Transformation
Atoll
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
2006 Higher Education Research Data Collection
 
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Created: Wed, 15 Aug 2007, 06:14:23 EST