000202026 001__ 202026
000202026 005__ 20190317000015.0
000202026 020__ $$a978-1-138-02674-2
000202026 0247_ $$2doi$$a10.1201/b17133-136
000202026 037__ $$aCONF
000202026 245__ $$aThree dimensional flow field at confluent fixed-bed open channels
000202026 269__ $$a2014
000202026 260__ $$bCRC Press/Balkema$$c2014$$aLeiden
000202026 336__ $$aConference Papers
000202026 500__ $$a[989]
000202026 520__ $$aRiver confluences are known for their marked 3D patterns and, due to the complexity of local flow features and bed morphology, they require particular consideration. Although there are studies on the flow structure in junctions of two streams, amore detailed description of the flow patterns is still required. The objective of this work is to contribute to such description at river confluence for concordant bed, where both main and tributary channel beds have the same elevation. For that purpose, a set of experiments with fixed bed under quasi-uniform approach flow conditions was carried out. The experimental facility included a 12 m long and 1 m wide main channel, and a 4.5 m long and 0.15 m wide tributary channel. The confluence angle was 70° so as to represent common natural conditions and the discharge ratio between discharges in the tributary and in the main channel was kept constant. An Acoustic Doppler Velocimeter (ADV) with a side-looking configuration was used to measure the three components of flow velocity on a dense grid of measuring points, providing the accurate characterization of the mean flow and second-order velocity moments. The acquired data set constitutes the most refined characterization of river confluence flow structures known to date, due to the adopted temporal and spatial discretization, and may serve for the validation of 3D numerical models of complex confluent flows. Flow dynamics zones typical of confluent beds are present in the studied case. The separation zone limits the effective lateral flow cross-section, and, hence, results in the added acceleration of the mainstream flow near the downstream junction corner. The upward orientated vertical velocities of high magnitude were observed all along the separation zone.
000202026 6531_ $$aRiver confluences
000202026 6531_ $$aConcordant bed
000202026 6531_ $$aComplex flow
000202026 6531_ $$aADV
000202026 700__ $$aBirjukova, Olga
000202026 700__ $$0245626$$g210089$$aGuillén Ludeña, Sebastián
000202026 700__ $$aAlegria, Francisco
000202026 700__ $$aCardoso, Antonio H.
000202026 7112_ $$dSeptember, 3-5, 2014$$cLausanne, Switzerland$$aRiver Flow 2014
000202026 720_1 $$aSchleiss, Anton$$eed.$$g112841$$0241228
000202026 720_1 $$aDe Cesare, Giovanni$$eed.$$g101010$$0240404
000202026 720_1 $$aFranca, Mário J.$$eed.
000202026 720_1 $$aPfister, Michael$$eed.$$g202221$$0244418
000202026 773__ $$tProceedings of River Flow 2014$$q1007-1014
000202026 8564_ $$uhttps://infoscience.epfl.ch/record/202026/files/2014-989%20Three%20dimensional%20flow%20field%20at%20confluent%20fixed-bed%20open%20channels.pdf$$zn/a$$s359464$$yn/a
000202026 909C0 $$xU10263$$0252079$$pLCH
000202026 909C0 $$pPL-LCH$$xU10263$$0255473
000202026 909CO $$qGLOBAL_SET$$pconf$$pENAC$$ooai:infoscience.tind.io:202026
000202026 917Z8 $$x246105
000202026 917Z8 $$x246105
000202026 917Z8 $$x246105
000202026 917Z8 $$x202221
000202026 937__ $$aEPFL-CONF-202026
000202026 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000202026 980__ $$aCONF