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Reflection and Dissipation Characteristics of Non-overtopping Quarter Circle Breakwater with Low-mound Rubble Base
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 Title & Authors
Reflection and Dissipation Characteristics of Non-overtopping Quarter Circle Breakwater with Low-mound Rubble Base
Balakrishna, K; Hegde, Arkal Vittal; Binumol, S;
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 Abstract
Breakwaters are the coastal structures constructed either perpendicular (shore connected) or parallel (detached) to the coast. The main function of breakwater is to create a tranquil medium on its leeside by reflecting the waves and also dissipating the wave energy arriving from seaside, resulting in ease of manoeuvrability to boats or ships to their berthing places. Different types of breakwaters are being used at present, such as rubble mound breakwater, vertical wall type breakwater and composite breakwater. The objective of this paper is to investigate reflection coefficients (Kr) and dissipation (loss) coefficients (Kl) for physical models of Quarter circle caisson breakwater of three different radii of 0.550 m, 0.575 m and 0.600 m with S/D ratio of 2.5 (S=spacing between perforations, D=diameter of perforations). The models were tested in the monochromatic wave flume of the department, for different incident wave heights (Hi), Wave periods (T) and water depths (d). It was observed that reflection coefficient increased with increase in the wave steepness (Hi/gT2) and decreased with increase in depth parameter (d/gT2) and hs/d (Height of structure including rubble base/depth of water). The loss coefficient decreased with increase in the wave steepness and increased with increase in depth parameter and hs/d.
 Keywords
Reflection coefficient;Loss coefficient;Quarter circle breakwater;Wave steepness;Depth parameter;Ratio of height of structure to depth of water;
 Language
English
 Cited by
 References
1.
Dhinakaran, G., Sundar, V., Sundaravadivelu R. and Graw, K. U., Dynamic pressures and forces exerted on impermeable and seaside perforated semi-circular breakwaters due to regular waves, Journal of Ocean Engineering, 29 (2002) 1981-2004. crossref(new window)

2.
Dhinakaran, G., Sundar, V. and Graw, K. U., Effect of perforations and rubble mound height on wave transformation characteristics of surface piercing semi-circular breakwaters, Journal of Ocean Engineering, 36 (2009) 1182-1198. crossref(new window)

3.
Hegde, A. V., Subba Rao and Kumar, K., Run-up, run-down and reflection characteristics of semicircular breakwater for varying seaside perforations, Journal of Hydraulic Engineering, 18 (2012) 145-151. crossref(new window)

4.
Hegde, A. V. and Ravikiran L., Wave-Structure Interaction for Submerged Quarter-Circle Breakwaters of Different Radii - Reflection Characteristics, World Academy of Science, Engineering and Technology, 79 (2013) 1367-1371.

5.
Issacson, M., Measurement of regular wave reflection, Journal of Waterway, Port, Coastal and Ocean Engineering, 117 (1991) 553-569. crossref(new window)

6.
Muttray, M., Oumeraci, H., Shimosako K. and Takahashi, S., Hydraulic Performance of a High Mound Composite Breakwater, Coastal Engineering (1998) 2207-2220.

7.
Qie, L., Zhang, X., Jiang X. and Qin, Y., Research on Partial Coefficients for Design of Quarter-circular Caisson Breakwater, Journal of Marine Science and Application, 12 (2013) 65-71. crossref(new window)

8.
Sundar, V. and Raghu D., 1997 Wave induced pressures on semi-circular breakwater. 2nd Indian National Conference on Harbour and Ocean Engineering, Thiruvananthapuram, Kerala December 7-10, 278-287, (1997).

9.
Sundar, V. and Subbarao, B. V. V., Hydrodynamic performance characteristics of quadrant front-face pile supported breakwater, Journal of Waterway, Port, Coastal and Ocean Engineering, 129 (2003) 22-33. crossref(new window)

10.
Yan-Jiao, S., Mi-ling, WU., Xue-lian, J. and Yan-bao, LI., Experimental researches on reflective and transmitting performances of quarter circular breakwater under regular and irregular waves, China Ocean Engineering, 25 (3) (2011) 469-478. crossref(new window)