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Lookup NU author(s): Professor Longbin Tao
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A very large ring-shaped structure composed of spar-type modules is proposed as an intermediate base for supporting deepwater oil exploitation. One of the features of the structure is the attachment of a double-layered perforated-wall breakwater, which reduces the wave energy inside the harbour. To establish the hydrodynamics of the complex structure, the characteristics of the breakwater were experimentally investigated using six different configurations. The transfer functions of the waves inside the harbour were found to have multiple peaks, which were produced by the interaction of the transmitted waves with the diffracted waves. The incident wave amplitude was also observed to significantly affect the wave energy dissipation of the breakwater for short waves, where as the effect was small for long waves. The wave loss coefficients, wave run-up, mooring force, and surge motion were all observed to increase significantly with decreasing porosity. However, the vertical motions were quite small owing to the low natural frequencies, and they were negligibly affected by the porosity. By quantitative estimation of the effects of the porosity, it was found that the low-frequency horizontal motion, mooring force, and wave attenuation were the critical factors to be considered in the design of a breakwater attached to floating structures.
Author(s): Xiao L, Kou Y, Tao L, Yang L
Publication type: Article
Publication status: Published
Journal: Ocean Engineering
Year: 2016
Volume: 111
Pages: 279-291
Print publication date: 01/01/2016
Online publication date: 01/12/2015
Acceptance date: 13/11/2015
ISSN (print): 0029-8018
ISSN (electronic): 1873-5258
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/j.oceaneng.2015.11.007
DOI: 10.1016/j.oceaneng.2015.11.007
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