Comparison of depth-averaged concentration and bed load flux sediment transport models of dam-break flow

dc.contributor.authorZhao, Jiaheng
dc.contributor.authorÖzgen, Ilhan
dc.contributor.authorLiang, Dongfang
dc.contributor.authorHinkelmann, Reinhard
dc.date.accessioned2019-04-29T11:49:23Z
dc.date.available2019-04-29T11:49:23Z
dc.date.issued2017
dc.description.abstractThis paper presents numerical simulations of dam-break flow over a movable bed. Two different mathematical models were compared: a fully coupled formulation of shallow water equations with erosion and deposition terms (a depth-averaged concentration flux model), and shallow water equations with a fully coupled Exner equation (a bed load flux model). Both models were discretized using the cell-centered finite volume method, and a second-order Godunov-type scheme was used to solve the equations. The numerical flux was calculated using a Harten, Lax, and van Leer approximate Riemann solver with the contact wave restored (HLLC). A novel slope source term treatment that considers the density change was introduced to the depth-averaged concentration flux model to obtain higher-order accuracy. A source term that accounts for the sediment flux was added to the bed load flux model to reflect the influence of sediment movement on the momentum of the water. In a one-dimensional test case, a sensitivity study on different model parameters was carried out. For the depth-averaged concentration flux model, Manning's coefficient and sediment porosity values showed an almost linear relationship with the bottom change, and for the bed load flux model, the sediment porosity was identified as the most sensitive parameter. The capabilities and limitations of both model concepts are demonstrated in a benchmark experimental test case dealing with dam-break flow over variable bed topography.en
dc.identifier.eissn1674-2370
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/9358
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-8416
dc.language.isoenen
dc.relation.ispartof10.14279/depositonce-8380
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subject.ddc627 Wasserbaude
dc.subject.othershallow wateren
dc.subject.othersediment transporten
dc.subject.otherbed load flux modelen
dc.subject.otherdepth-averaged concentration flux modelen
dc.subject.otherdam breaken
dc.subject.otherFlachwasserde
dc.subject.otherSedimenttransportde
dc.subject.otherDammbruchde
dc.titleComparison of depth-averaged concentration and bed load flux sediment transport models of dam-break flowen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1016/j.wse.2017.12.006en
dcterms.bibliographicCitation.issue4en
dcterms.bibliographicCitation.journaltitleWater Science and Engineeringen
dcterms.bibliographicCitation.originalpublishernameElsevieren
dcterms.bibliographicCitation.originalpublisherplaceAmsterdamen
dcterms.bibliographicCitation.pageend294en
dcterms.bibliographicCitation.pagestart287en
dcterms.bibliographicCitation.volume10en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Bauingenieurwesen::FG Wasserwirtschaft und Hydrosystemmodellierungde
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.groupFG Wasserwirtschaft und Hydrosystemmodellierungde
tub.affiliation.instituteInst. Bauingenieurwesende
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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