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A Critical Analysis and Validation of the Accuracy of Wave Overtopping Prediction Formulae for OWECs

Author

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  • David Gallach-Sánchez

    (Department of Civil Engineering, Ghent University, Technologiepark 904, 9052 Zwijnaarde, Belgium)

  • Peter Troch

    (Department of Civil Engineering, Ghent University, Technologiepark 904, 9052 Zwijnaarde, Belgium)

  • Andreas Kortenhaus

    (Department of Civil Engineering, Ghent University, Technologiepark 904, 9052 Zwijnaarde, Belgium)

Abstract

The development of wave energy devices is growing in recent years. One type of device is the overtopping wave energy converter (OWEC), for which the knowledge of the wave overtopping rates is a basic and crucial aspect in their design. In particular, the most interesting range to study is for OWECs with steep slopes to vertical walls, and with very small freeboards and zero freeboards where the overtopping rate is maximized, and which can be generalized as steep low-crested structures. Recently, wave overtopping prediction formulae have been published for this type of structures, although their accuracy has not been fully assessed, as the overtopping data available in this range is scarce. We performed a critical analysis of the overtopping prediction formulae for steep low-crested structures and the validation of the accuracy of these formulae, based on new overtopping data for steep low-crested structures obtained at Ghent University. This paper summarizes the existing knowledge about average wave overtopping, describes the physical model tests performed, analyses the results and compares them to existing prediction formulae. The new dataset extends the wave overtopping data towards vertical walls and zero freeboard structures. In general, the new dataset validated the more recent overtopping formulae focused on steep slopes with small freeboards, although the formulae are underpredicting the average overtopping rates for very small and zero relative crest freeboards.

Suggested Citation

  • David Gallach-Sánchez & Peter Troch & Andreas Kortenhaus, 2018. "A Critical Analysis and Validation of the Accuracy of Wave Overtopping Prediction Formulae for OWECs," Energies, MDPI, vol. 11(1), pages 1-20, January.
  • Handle: RePEc:gam:jeners:v:11:y:2018:i:1:p:133-:d:125676
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    References listed on IDEAS

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    1. Margheritini, L. & Vicinanza, D. & Frigaard, P., 2009. "SSG wave energy converter: Design, reliability and hydraulic performance of an innovative overtopping device," Renewable Energy, Elsevier, vol. 34(5), pages 1371-1380.
    2. Diego Vicinanza & Lucia Margheritini & Jens Peter Kofoed & Mariano Buccino, 2012. "The SSG Wave Energy Converter: Performance, Status and Recent Developments," Energies, MDPI, vol. 5(2), pages 1-34, January.
    3. Tedd, James & Peter Kofoed, Jens, 2009. "Measurements of overtopping flow time series on the Wave Dragon, wave energy converter," Renewable Energy, Elsevier, vol. 34(3), pages 711-717.
    4. Kofoed, Jens Peter & Frigaard, Peter & Friis-Madsen, Erik & Sørensen, Hans Chr., 2006. "Prototype testing of the wave energy converter wave dragon," Renewable Energy, Elsevier, vol. 31(2), pages 181-189.
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