Experimental Study for the Hydraulic Efficiency of an Overtopping Type Wave Energy Converter with a Circular Runup Ramp

Mehmet Adil Akgul, Mehmet Sedat Kabdaşlı


In this study, overtopping rates on a circular cylindrical overtopping ramp under regular waves have been measured and hydraulic efficiency of the device as a wave energy converter has been assessed by analyzing the energy budget of the overtopped water mass.  The study has been carried out by conducting two-dimensional physical model tests.  The variation of overtopping rates with wave parameters has been studied and an empirical formula has been evaluated for the estimation of overtopping rates.  The efficiency of the system has been calculated as the ratio of the mean power of the overtopped water mass to the wave energy flux.  Results indicate that the hydraulic efficiency based on the kinetical komponent can reach 40% for the case of steep waves and the efficiency is reduced with increasing wavelength.

Tam Metin:



Cruz, J., Ocean wave energy: Current status and future perspectives, Springer Verlag, Netherlands, (2008).

Thorpe, T.W., A brief review of wave energy - A report produced for the UK department of trade and industry, ETSU-R120, UK, (1999).

Bedard, R. ve Hagerman, G. Offshore Wave Energy Conversion Devices E2I EPRI Evaluation Report No. E2I-EPRI-WP-004-US Rev. 1, Haziran 2004.

Margheritini, L., Vicinanza, D. and Frigaard, P., SSG wave energy converter: Design, reliability and hydraulic performance of an innovative overtopping device, Renewable Energy, 34, 1371-1380, (2009).

Kofoed, J.P., Frigaard, P., Friis-Madsen, E. and Sørensen, H.C., Prototype testing of the wave energy converter wave dragon, Renewable Energy, 31, 181-189, (2006).

Kofoed, J.P., Hald, T. and Frigaard, P., Experimental study of a multi level overtopping wave power device, Proc. of the 10th Congress of IMAM, Crete, (2002).

Brooke, J., Wave energy conversion, Elsevier Science Ltd., Oxford, (2003).

Saville, T. JR., Laboratory data on wave runup and overtopping on shore structures, Technical Memorandum No. 64, US Army Corps of Engineers, Beach Erosion Board, Washington, D.C., (1955).

Grantham, K.N., Wave run-up on sloping structures, Trans. Amer. Geophysical Union, 34, 5, 720-724, (1953).

Sibul, O. Flow over reefs and structures by wave action, Trans. Amer. Geophysical Union, 36, 1, 61-69, (1955).

Paape, A., Experimental data on the overtopping of seawalls by waves, Proc. of the 7th ICCE, 674-681, The Hague, (1960).

Shi-Igai, K. and Kono, T., Analytical approach on wave overtopping on levees, Proc. of the 12th ICCE, 563-573, Washington D.C., (1970).

Weggel, J.R., Wave overtopping equation, Proc. of the 15th ICCE, 2737-2755, Honolulu, (1976).

Owen, M.W., Design of sea walls allowing for wave overtopping, Technical Report No. EX 924, HR Wallingford, Oxon, (1980).

Ahrens, J.P. and Heimbaugh, M.S., Seawall overtopping model, Proc. of the 21st ICCE, 795-806, Costa de Sol-Malaga, (1988).

Juhl, J. and Sloth, P., Wave overtopping of breakwaters under oblique waves, Proc. of the 24th ICCE, 1182-1196, Kobe, (1994).

van der Meer, J.W. and Janssen, W., Wave run-up and wave overtopping at dikes, in Kobayashi and Demirbilek, Wave Forces on Inclined and Vertical Wall Structures, ASCE Publishing, 1-27, Rosewood, USA, (1995).

Schüttrumpf, H.F., Wellenüberlaufströmung bei Seedeichen - Experimentelle und theoretische Untersuchungen, Ph.D. Thesis, Leichtweiss-Institut für Wasserbau, TU Braunschweig, Germany, (2001).

Aminti, P. and Franco, L., Wave overtopping on rubble mound breakwaters, Proc. of the 21st ICCE, 770-781, Costa de Sol-Malaga, (1988).

Bradbury, A.P., Allsop, N.W. and Stephens, R.V., Hydraulic performance of breakwater crown walls, Technical Report No. 146, HR Wallingford, Oxon, (1988).

Pedersen, J. and Burcharth, H.F., Wave forces on crown walls, Proc. of the 23rd ICCE, 1489-1502, Venice, (1992).

Kofoed, J.P., Wave overtopping of marine structures - Utilization of wave energy, Ph.D. Thesis, Aalborg University, Denmark, (2002).

Pullen, T., Allsop, N.W.H., Bruce, T., Kortenhaus, A., Schüttrumpf, H. and van der Meer, J.W., EuroTOP: Wave overtopping of sea defences and related structures: Assessment manual, Boyens-Medien GmbH, Holstein, Germany, (2007).

Victor, L. and Troch, P., Wave overtopping at smooth impermeable steep slopes with low crest freeboards, J. of Waterway, Port, Coastal and Ocean Engineering, 138, 5, 372-385, (2012).

van der Meer, J.W. and Bruce, T., New physical insights and design formulae on wave overtopping at sloping and vertical structures, J. of Waterway, Port, Coastal and Ocean Engineering, ASCE, 140, 6, 1-18, (2014).

van der Meer, J.W., Allsop, N.W.H., Bruce, T., De Rouck, J., Kortenhaus, A., Pullen, T., Shüttrumpf, H., Troch, P. and Zanuttigh, B., EurOtop 2016: Manual on wave overtopping of sea defences and structures, (2016).

www.overtopping-manual.com (14.12.2016).

Akgul, M.A., Design of a floating breakwater - wave energy converter hybrid, Ph.D. Thesis, ITU Institute of Science and Technology, Istanbul, (2014).

Schüttrumpf, H. and Oumeraci, H., Layer thicknesses and velocities of wave overtopping flow at seadikes, Coastal Engineering, 52, 473-495, (2005).


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