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Shallow flow over a bed with a lateral change of roughness

Dupuis, V.; Moulin, F.; Cazin, S.; Marchal, M.; Elyakime, P.; Barron, J.-D.; Eiff, O. 1
1 Institut für Hydromechanik (IFH), Karlsruher Institut für Technologie (KIT)


River beds frequently exhibit a lateral variation of roughness. For example, in the case of an overflowing river, the main channel has a smoother topography compared to the adjacent floodplains where vegetation and land occupation yield an important hydraulic roughness. The lateral difference in roughness can induce a high lateral velocity gradient within the river crosssection that gives birth to a mixing layer. This mixing layer leads to fluid and momentum transfers between the two adjacent beds. To understand such mixing processes in rivers is important for predicting stage-discharge relationships and the velocity distribution within the cross-section. In order to address these issues in the context of a shallow water flow with a water depth h of the same order as the roughness elements of the bed, experiments were undertaken in a 26 m long and 1.1 m wide glass-walled open-channel flume. One half-side of the bed was covered with an array of cubes of height k arranged in a square configuration, the other side with smooth glass. Three different levels of cube submergence h/k were examined (h/k = 0.8, 1.5 and 2). The experiments and measurements were designed to yield the flow in the complete volume of the interstices across the cube array. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000086600
Veröffentlicht am 17.10.2018
DOI: 10.1051/e3sconf/20184002039
Zitationen: 2
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hydromechanik (IFH)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2267-1242
KITopen-ID: 1000086600
Erschienen in 9th International Conference on Fluvial Hydraulics, River Flow 2018; Lyon-Villeurbanne; France; 5 September 2018 through 8 September 2018. Ed.: A. Paquier
Verlag EDP Sciences
Seiten Art. Nr.: 02039
Serie E3S Web of Conferences ; 40
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