Marine Hydrography

Experimental study of reef crest’s effects on wave transformation and wave-induced setup over fringing reefs

  • YAO Yu ,
  • YUAN Wan-cheng ,
  • DU Rui-chao ,
  • JIANG Chang-bo
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  • 1. School of Hydraulic Engineering, Changsha University of Science &Technology, Changsha 410004, China;
    2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

Received date: 2015-03-02

  Revised date: 2015-05-07

  Online published: 2015-11-24

Abstract

To understand the role of reef crest in wave transformation and wave-induced setup over fringing reef, a series of experiments were carried out in a wave flume using idealized models that simulate a field fringing reef with the presence of a reef crest. Experimental results were reported for four water depths and for a variety of regular wave conditions. Preliminary analysis showed that the presence of the reef crest significantly alters the wave transformation process near the reef edge, especially the intensity of wave breaking and the generation of high harmonic waves. Wave setup was found to increase with the increase of incident wave height and wave period, but decrease with the increase of water depth. The reef crest controls the water level above the reef flat in a way similar to that a submerged breakwater controls the water level on the leeside of the breakwater; wave setup over a reef flat with a crest is generally much larger than that without; and a new dimensionless parameter to analyze the wave setup is introduced in order to take the crest configuration into consideration.

Cite this article

YAO Yu , YUAN Wan-cheng , DU Rui-chao , JIANG Chang-bo . Experimental study of reef crest’s effects on wave transformation and wave-induced setup over fringing reefs[J]. Journal of Tropical Oceanography, 2015 , 34(6) : 19 -25 . DOI: 10.11978/2015031

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