Show simple item record

dc.contributor.authorGuo, Zhen
dc.contributor.authorJeng, Dong-Sheng
dc.contributor.authorZhao, Hongyi
dc.contributor.authorGuo, Wei
dc.contributor.authorWang, Lizhong
dc.date.accessioned2019-07-04T12:35:34Z
dc.date.available2019-07-04T12:35:34Z
dc.date.issued2019
dc.identifier.issn0378-3839
dc.identifier.doi10.1016/j.coastaleng.2018.10.012
dc.identifier.urihttp://hdl.handle.net/10072/383392
dc.description.abstractSediment incipient motion is the first step of the whole process of sediment transport. However, previous numerical works simplified the seabed surface as a type of impermeable and rigid boundary, and ignored the effect of seepage flow on the mobility of bed particles. In this paper, to reveal the physics behind sediment incipient motion around a free spanning pipeline, an integrated numerical model, coupling the SST (Shear-Stress Transport) turbulence model with the porous seabed model, was proposed. Numerical studies showed that with the periodic formation and shedding of vortices around the pipeline, both the oscillatory and residual excess pore-pressures developed within the seabed. In some cases, the vertical gradient of excess pore-pressure (seepage force) had a significant impact on the mobility of bed particles around the pipeline. It was found that lower saturation degree and seabed permeability would remarkably increase both the oscillatory and residual seepage forces, and thus enhance bed particle mobility. While for a sandy seabed with smaller soil shear modulus, the oscillatory seepage force was only slightly reduced, but a high residual seepage force would be generated with time. This could lead to obvious decrease in the submerged weight of bed particles, making them more easily dragged away from the seabed.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherELSEVIER SCIENCE BV
dc.relation.ispartofpagefrom50
dc.relation.ispartofpageto62
dc.relation.ispartofjournalCOASTAL ENGINEERING
dc.relation.ispartofvolume143
dc.subject.fieldofresearchCivil Engineering
dc.subject.fieldofresearchGeology
dc.subject.fieldofresearchOceanography
dc.subject.fieldofresearchcode0905
dc.subject.fieldofresearchcode0403
dc.subject.fieldofresearchcode0405
dc.titleEffect of seepage flow on sediment incipient motion around a free spanning pipeline
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.description.versionPost-print
gro.rights.copyright© 2019 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorJeng, Dong-Sheng


Files in this item

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record