[en] This study experimentally assesses the influence of varying the inlet boundary condition on the flow patterns in rectangular shallow reservoirs. Two types of inlet boundary conditions were compared: a free surface inlet channel, and a pressurized circular inlet jet positioned at three different elevations over the flow depth (centroid of the inlet jet situated at 25%, 50%, or 75% of the flow depth). The outlet boundary condition was a free surface channel in all cases. Twenty-two experiments were done with two distinct reservoir lengths (length-to-width ratios of 1.1 and 2.0) and three hydraulic boundary conditions (Froude numbers of 0.14, 0.16, and 0.21). Velocity fields were measured with Large-Scale Particle Image Velocimetry (LSPIV) at the surface, and with an Acoustic Doppler Velocity Profiler
(ADVP) at several cross sections. The flow patterns are greatly influenced by the inlet boundary condition and the reservoir geometry, but to a lesser extent by the hydraulic boundary condition. For an inlet circular jet located near the reservoir bottom, an unstable flow type, changing over time in a chaotic manner, was observed regardless of the reservoir length and of the inlet flow rate. The same type of unstable flow pattern was observed for a relatively long reservoir and the lowest tested flow rate, irrespective of the vertical positioning of the inlet jet. In all other tested configurations, a steady reattached jet was found in the reservoir equipped with a pressurized inlet jet. In addition to providing new knowledge on flow patterns in shallow reservoirs with an inlet jet, the experimental data presented here will prove valuable for evaluating flow computational models.
Research Center/Unit :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Civil engineering
Author, co-author :
Chagdali, El Mehdi; National Laboratory for Hydraulics and Environment (LNHE), EDF R&D, Chatou, France ; Saint Venant Laboratory for Hydraulics, University Paris-Est, Chatou, France ; Research Group of Hydraulics in Environmental and Civil Engineering (HECE), University of Liège, Liège, Belgium
El Kadi Abderrezzak, Kamal; National Laboratory for Hydraulics and Environment (LNHE), EDF R&D, Chatou, France ; Saint Venant Laboratory for Hydraulics, University Paris-Est, Chatou, France
Erpicum, Sébastien ; Université de Liège - ULiège > Urban and Environmental Engineering
Goeury, Cédric; National Laboratory for Hydraulics and Environment (LNHE), EDF R&D, Chatou, France ; Saint Venant Laboratory for Hydraulics, University Paris-Est, Chatou, France
Secher, Matthieu; Hydraulics Engineering Center (CIH), EDF Hydro, La Motte-Servolex, France
Dewals, Benjamin ; Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Language :
English
Title :
Flow patterns in shallow rectangular reservoirs with open channel inlet or pipe flow inlet at various depths: An experimental study
Publication date :
2025
Journal title :
International Journal of Sediment Research
ISSN :
1001-6279
Publisher :
Elsevier
Volume :
40
Issue :
2
Pages :
209-221
Peer reviewed :
Peer reviewed
Development Goals :
6. Clean water and sanitation 7. Affordable and clean energy 11. Sustainable cities and communities 13. Climate action
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