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dc.contributor.authorChen, Linya
dc.contributor.authorJeng, Dong-Sheng
dc.contributor.authorLiao, Chencong
dc.contributor.authorTong, Dagui
dc.date.accessioned2019-09-20T01:27:40Z
dc.date.available2019-09-20T01:27:40Z
dc.date.issued2019
dc.identifier.issn2077-1312
dc.identifier.doi10.3390/jmse7060189
dc.identifier.urihttp://hdl.handle.net/10072/387559
dc.description.abstractCofferdams are frequently used to assist in the construction of offshore structures that are built on a natural non-homogeneous anisotropic seabed. In this study, a three-dimensional (3D) integrated numerical model consisting of a wave submodel and seabed submodel was adopted to investigate the wave–structure–seabed interaction. Reynolds-Averaged Navier–Stokes (RANS) equations were employed to simulate the wave-induced fluid motion and Biot’s poroelastic theory was adopted to control the wave-induced seabed response. The present model was validated with available laboratory experimental data and previous analytical results. The hydrodynamic process and seabed response around the dumbbell cofferdam are discussed in detail, with particular attention paid to the influence of the depth functions of the permeability Ki and shear modulus Gj . Numerical results indicate that to avoid the misestimation of the liquefaction depth, a steady-state analysis should be carried out prior to the transient seabed response analysis to first determine the equilibrium state caused by seabed consolidation. The depth function Gj markedly affects the vertical distribution of the pore pressure and the seabed liquefaction around the dumbbell cofferdam. The depth function Ki has a mild effect on the vertical distribution of the pore pressure within a coarse sand seabed, with the influence concentrated in the range defined by 0.1 times the seabed thickness above and below the embedded depth. The depth function Ki has little effect on seabed liquefaction. In addition, the traditional assumption that treats the seabed parameters as constants may result in the overestimation of the seabed liquefaction depth and the liquefaction area around the cofferdam will be miscalculated if consolidation is not considered. Moreover, parametric studies reveal that the shear modulus at the seabed surface Gz0 has a significant influence on the vertical distribution of the pore pressure. However, the effect of the permeability at the seabed surface Kz0 on the vertical distribution of the pore pressure is mainly concentrated on the seabed above the embedded depth in front and to the side of the cofferdam. Furthermore, the amplitude of pore pressure decreases as Poisson’s ratio μs increases.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherMultidisciplinary Digital Publishing Institute (MDPI)
dc.relation.ispartofissue6
dc.relation.ispartofjournalJournal of Marine Science and Engineering
dc.relation.ispartofvolume7
dc.subject.fieldofresearchMaritime Engineering
dc.subject.fieldofresearchOceanography
dc.subject.fieldofresearchFisheries Sciences
dc.subject.fieldofresearchcode0911
dc.subject.fieldofresearchcode0405
dc.subject.fieldofresearchcode0704
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsOceanography
dc.subject.keywordswave-structure-seabed interaction
dc.subject.keywordspermeability
dc.titleWave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationChen, L; Jeng, D-S; Liao, C; Tong, D, Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed, Journal of Marine Science and Engineering, 2019, 7 (6)
dcterms.licensehttps://creativecommons.org/licenses/by/4.0/
dc.date.updated2019-09-20T01:24:39Z
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© 2019 by the Authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorJeng, Dong-Sheng


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