Technical Briefs

Regular Wave Measurements on a Submerged Semicircular Breakwater

[+] Author and Article Information
G. Dhinakaran

School of Civil Engineering, SASTRA University, Thanjavur 613402, Indiadhinaji@gmail.com

V. Sundar

Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, Indiavsundar@iitm.ac.in

R. Sundaravadivelu

Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, Indiarsun@iitm.ac.in

K. U. Graw

Department of Civil Engineering, University of Leipzig, Leipzig 04109, Germanygrawsun@hotmail.com

J. Offshore Mech. Arct. Eng 132(3), 034501 (Jun 24, 2010) (6 pages) doi:10.1115/1.4000397 History: Received July 12, 2008; Revised August 21, 2009; Published June 24, 2010; Online June 24, 2010

The submerged semicircular breakwater (SBW) is mainly adopted to prevent beach erosion and to reduce the incident wave energy on its leeside, if it is used in front of a vertical breakwater. In addition, it facilitates the premature wave breaking, which in turn causes the reduction in wave energy. The dynamic pressures and forces exerted on the submerged SBW with 7%, 11%, and 17% of the exposed surface area with perforations on its seaside due to regular waves were measured. The hydrodynamic characteristics such as variations in the dimensionless pressures and forces, reflection and transmission coefficients on the semicircular caisson as a function of scattering parameter for three different water depths are presented and an optimum depth of submergence is arrived. The results on the above stated variables for seaside perforated SBWs are compared with the results of an impermeable SBW to study the effect of perforations.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Experimental setup for the study

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Figure 2

Isometric view of the seaside perforated SBW model

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Figure 3

Details of six-component force balances

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Figure 4

Effect of perforation on Kr, Kt, and Kl

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Figure 5

(a) Effect of perforation on the dimensionless pressure for hw/ht=1.0, (b) effect of perforation on the dimensionless pressure for hw/ht=1.2, and (c) effect of perforation on a dimensionless pressure for hw/ht=1.4

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Figure 6

Effect of perforation on (Fh)non and (Fv)non



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