Front Wall and In-Chamber Impact Loads on a Breakwater-Integrated Oscillating Water Column
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146, Issue 5
Abstract
This work aims to enhance the evidence base of extreme impact loads on the front (outer) wall and within the chamber of an oscillating water column (OWC) integrated into a vertical breakwater. Data are from large-scale physical model tests (at 1:9 scale) at the large wave channel (GWK). The paper shows that established prediction methods for nonimpulsive and impulsive wave loads for conventional vertical breakwaters can be applied to the front wall of OWC breakwaters. For the first time, impact loads within the OWC chamber have been quantified, on the rear in-chamber wall and on the chamber ceiling. These are found to reach magnitudes comparable to front wall wave impacts. Novel video records from within the OWC chamber provide new insight on water column behavior, including three different classifications identified as “single,” “successional,” and “water column” ceiling impacts. Conditions at risk of violent impacts within the chamber are also identified. These will be valuable in quantifying front (outside) design forces, in-chamber impacts, and in seeking to minimize in-chamber impacts occurrence, in construction and in operational phases.
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Acknowledgments
For the original GWK tests, the authors would like record their appreciation of the University of Edinburgh, HR Wallingford, University of Campania “Luigi Vanvitelli,” Queen's University Belfast, and University of East Anglia for contributing staff time, and of Drs. John Alderson (HR Wallingford), Viviana Russo (Queen's University of Belfast), Vincenzo Ferrante (University of Campania “Luigi Vanvitelli”), Matthias Kudella (GWK) and the wider GWK team for design, construction, and support of testing. The authors are also grateful to Professor Trevor Whittaker (Queen's University Belfast) and Dr. Mark Cooker (University of East Anglia). The funding for GWK facility is provided by the European Community's Seventh Framework Programme through the Integrating Activity HYDRALAB IV, Contract no 261520. Krisna Pawitan also would like to express his gratitude to Indonesia Endowment Fund for Education (LPDP) for the financial support for his studies in Edinburgh.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146 • Issue 5 • September 2020
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© 2020 American Society of Civil Engineers.
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Received: May 14, 2019
Accepted: Mar 19, 2020
Published online: Jul 7, 2020
Published in print: Sep 1, 2020
Discussion open until: Dec 7, 2020
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