Environmental Fluid Mechanics

, Volume 18, Issue 5, pp 1293–1295 | Cite as

Discussion of “Tang, H., Zhang, H., & Yuan, S. (2018). Hydrodynamics and contaminant transport on a degraded bed at a 90-degree channel confluence. Environmental Fluid Mechanics, 18(2), 443–463”

  • Sebastien Pouchoulin
  • Pedro Xavier Ramos
  • Emmanuel MignotEmail author
  • Laurent Schindfessel
  • Tom De Mulder
  • Nicolas Riviere


The authors measured and computed the hydrodynamics and passive scalar dispersion in 90-degree open channel confluences over flat and degraded beds with a dominant upstream or tributary inflow. The present discussion essentially deals with the direction of rotation of the secondary currents, reported for the flat bed configuration with dominant tributary inflow. This rotation direction is indeed surprisingly opposite to the ones reported in the literature, both from calculations and measurements, even if present geometry slightly differs from literature geometries.


Channel confluence Secondary current Rotation direction Contaminant plume 


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Univ-Lyon, LMFA UMR5509, INSA LyonVilleurbanneFrance
  2. 2.Hydraulics Laboratory, Department of Civil EngineeringGhent UniversityGhentBelgium

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