A coupled-mode technique for the transformation of ship-generated waves over variable bathymetry regions

Belibassakis, KA

dc.contributor.author	Belibassakis, KA	en
dc.date.accessioned	2014-03-01T01:18:31Z
dc.date.available	2014-03-01T01:18:31Z
dc.date.issued	2003	en
dc.identifier.issn	0141-1187	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15054
dc.subject	Coupled-mode model	en
dc.subject	Ship-wave wash	en
dc.subject	Variable bathymetry	en
dc.subject.classification	Engineering, Ocean	en
dc.subject.classification	Oceanography	en
dc.subject.other	Coastal zones	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Diffraction	en
dc.subject.other	Frequency domain analysis	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Refraction	en
dc.subject.other	Ships	en
dc.subject.other	Transfer functions	en
dc.subject.other	Water waves	en
dc.subject.other	Wave propagation	en
dc.subject.other	Near field waves	en
dc.subject.other	Ocean research	en
dc.subject.other	Ship-wave spectra	en
dc.subject.other	Oceanography	en
dc.subject.other	bathymetry	en
dc.subject.other	ship motion	en
dc.subject.other	wave diffraction	en
dc.title	A coupled-mode technique for the transformation of ship-generated waves over variable bathymetry regions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.apor.2004.05.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.apor.2004.05.002	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	In the present work, a coupled-mode technique is applied to the transformation of ship's waves over variable bathymetry regions, characterised by parallel depth-contours, without any mild-slope assumption. This method can be used, in conjunction with ship's near-field wave data in deep water or in constant-depth, as obtained by the application of modern (linearised or non-linear) ship computational fluid dynamic (CFD) codes, or experimental measurements, to support the study of wave wash generated by fast ships and its effects on the nearshore/coastal environment. Under the assumption that the ship's track is straight and parallel to the depth-contours, and relatively far from the bottom irregularity, the problem of propagation-refraction-diffraction of ship-generated waves in a coastal environment is efficiently treated in the frequency domain, by applying the consistent coupled-mode model developed by Athanassoulis and Belibassakis [J. Fluid Mech. 1999;389] to the calculation of the transfer function enabling the pointwise transformation of ship-wave spectra over the variable bathymetry region. Numerical results are presented for simplified ship-wave systems, obtained by the superposition of source-sink Havelock singularities simulating the basic features of the ship's wave pattern. The spatial evolution of the ship-wave system is examined over a smooth but steep shoal, resembling coastal environments, both in the subcritical and in the supercritical case. Since any ship free-wave system, either in deep water or in finite depth, can be adequately modelled by wavecut analysis and suitable distribution of Havelock singularities e.g. as presented by Scrags [21st Int. Conf. Offshore Mech. Arctic Eng., OMAE2002, Oslo, Norway, June 2002], the present method, in conjunction with ship CFD codes, supports the prediction of ship wash and its impact on coastal areas, including the effects of steep sloping-bed parts. (C) 2004 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Applied Ocean Research	en
dc.identifier.doi	10.1016/j.apor.2004.05.002	en
dc.identifier.isi	ISI:000223389400002	en
dc.identifier.volume	25	en
dc.identifier.issue	6	en
dc.identifier.spage	321	en
dc.identifier.epage	336	en