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Energies 2018, 11(1), 133; https://doi.org/10.3390/en11010133

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

Department of Civil Engineering, Ghent University, Technologiepark 904, 9052 Zwijnaarde, Belgium
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Received: 4 December 2017 / Revised: 19 December 2017 / Accepted: 28 December 2017 / Published: 5 January 2018
(This article belongs to the Section Energy Fundamentals and Conversion)
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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. View Full-Text
Keywords: wave overtopping; wave energy; overtopping wave energy converter; OWEC; overtopping prediction; steep low-crested structures wave overtopping; wave energy; overtopping wave energy converter; OWEC; overtopping prediction; steep low-crested structures
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gallach-Sánchez, D.; Troch, P.; Kortenhaus, A. A Critical Analysis and Validation of the Accuracy of Wave Overtopping Prediction Formulae for OWECs. Energies 2018, 11, 133.

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