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The analysis is based on a novel data set comprised of the three\u2010dimensional time\u2010averaged velocity field, turbulence, bed morphology, and water surface levels acquired under controlled conditions in a laboratory setup. Confluence morphology at equilibrium stage was characterized by moderate bed discordance and pronounced bed erosion at the junction. This study suggests an updated conceptual model of flow hydrodynamics in realistic morphologically stable confluences. The near\u2010bed flow from the main channel proceeds underneath the tributary inflow into the tributary where it engages in the rotational motion of a strong secondary circulation observed within and downstream of the junction. The high\u2010speed near\u2010bed flow intensifies the stretching of the secondary cell past the downstream junction corner where it expands and aligns with slope of the bank\u2010attached bar. It is argued that the post\u2010confluence secondary cell is a result of flow separation at the tributary\u2010mouth bar and of the curvature of the shear layer, configuring a Prandtl\u2019s first kind of helical flow.<\/jats:p>","DOI":"10.1029\/2021wr029631","type":"journal-article","created":{"date-parts":[[2021,12,27]],"date-time":"2021-12-27T19:10:31Z","timestamp":1640632231000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Hydro\u2010Morphodynamics of an Open\u2010Channel Confluence With Bed Discordance at Dynamic Equilibrium"],"prefix":"10.1029","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2981-5049","authenticated-orcid":false,"given":"Olga B.","family":"Canelas","sequence":"first","affiliation":[{"name":"Coba, S.A.  Lisbon Portugal"}]},{"given":"Rui M. 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