Influence of offshore topography on the amplification of infragravity oscillations within a harbor |
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| Institution: | 1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2. Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Hohai University, Nanjing 210098, China;3. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;4. Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;1. Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;2. School of Engineering, University of Edinburgh, Edinburgh EH8 9YL, UK;3. Azakti Energy Ltd., Covent Garden, London WC2H 9JQ, UK;1. Department of Ocean Engineering, University of Rhode Island, USA;2. Graduate School of Oceanography, University of Rhode Island, USA;1. Department of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA, USA;2. Department of Water Resources and Environmental Engineering, Tamkang University, Taipei, Taiwan;3. Department of Hydraulic Engineering, Tongji University, Shanghai, China;4. Harbor and Coastal Engineering Department, CECI Engineering Consults, Inc., Taipei, Taiwan;1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003 China;2. Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Hohai University, Nanjing 210098, China;3. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;4. Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, 816-8580 Japan |
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| Abstract: | The main purpose of this article is to systematically investigate the influence of offshore fringing reef topography on the infragravity-period harbor oscillations. The infragravity (IG) period oscillations inside an elongated harbor induced by normally-incident bichromatic wave groups are simulated using a fully nonlinear Boussinesq model, FUNWAVE 2.0. Based on an IG wave decomposition method, effects of plane reef-face slopes, reef-face profile shapes and the existence of reef ridge on bound and free IG waves and their relative components inside the harbor are comprehensively studied. For the given harbor and reef ridge, the range of the reef-face slopes and the various profile shapes studied in this paper, results show that the amplitude of the free IG waves inside the harbor increases with the increasing of the reef-face slope; while the bound IG waves inside the harbor seem insensitive to it. The effects of the profile shapes on the IG period waves inside the harbor are closely related to the width of the reef face. The existence of the reef ridge can relieve the bound IG waves to some extent when the incident short wave amplitudes are relatively large, while its effects on the free IG waves are negligible. |
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| Keywords: | Harbor oscillations Resonance Topography Bound infragravity waves Free infragravity waves Wave groups FUNWAVE 2 0 model |
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