Martinez-Iturricastillo, Nahia and Ulazia, Alain and Ringwood, John (2023) Long term wave load trends against offshore monopile structures: A case study in the Bay of Biscay. Proceedings of the European Wave and Tidal Energy Conference, 15. pp. 1-7. ISSN 2706-6932

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Abstract

This study examines the trend in wave parameters over available annual records in the Bay of Biscay, where EWTEC 2023 is being hosted. There have been various renewable offshore energy projects in the 21st century in this region, such as the OWC (Oscillating Water Column) plant in Mutriku [1], or BiMEP (Biscay Marine Energy Platform)[2], the infrastructure for testing ocean devices in Armintza, where better characterization of the wave resource could help to provide design information to developing wave energy technology. Other studies [3] have shown that wave height has increased in recent decades, as well as the frequency at which extreme waves occur, which affects the fatigue experienced by deployed devices. The aim is to study the effect of the maximal wave height, its frequency, and loads on monopile cylindrical structures, which are basic component structures for wave energy converters and offshore wind turbines. The effect of this evolution, against these generic structures in offshore wind and wave energy devices, is studied using the 20th century reanalysis ERA20 (1900-2010) of ECMWF (European Centre for Medium-Range Weather Forecasts) [3]. A significant increase in two forces, drag forces and inertial forces, of up to 15%, is computed over 110 years at a gridpoint near the Western Basque coast, which constitutes a strong positive slope that can be also associated with climate change, and has strong implications for the design of new marine renewable energy technology.

Item Type:	Article
Keywords:	wave loads; ERA20C; offshore renewables; extreme events;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering
Item ID:	18986
Identification Number:	https://doi.org/10.36688/ewtec-2023-275
Depositing User:	Professor John Ringwood
Date Deposited:	08 Oct 2024 14:29
Journal or Publication Title:	Proceedings of the European Wave and Tidal Energy Conference
Publisher:	European Wave and Tidal Energy Conference EWTEC
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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