Experimental Comparison of Inclined Flows with and without Intense Sediment Transport: Flow Resistance and Surface Elevation
Publication: Journal of Hydraulic Engineering
Volume 148, Issue 12
Abstract
The effect of the intense transport of lightweight sediment without turbulent suspension (Shields numbers of mixture flow from 0.34 to 1.80) on resistance and surface elevation of water flow in an open channel is experimentally examined. Flows over fixed and mobile plane beds, at the same water flowrate and bed slope, are compared. Detailed measurements—including distributions of solids and velocity—permit to identify flow interfaces and determine the role of sediment transport on flow resistance. Two friction factors for mobile bed flows are introduced: one for water only and another one for the mixture. The first seems to be insensitive to the water submergence, while the latter follows the classic formula for the hydraulically rough regime: both increase with respect to the equivalent clear water flow. The water surface elevation seems unaltered by the presence of sediment transport, thus reducing the need for the modelling of the evolution of an erodible bed surface in, at least, some routine applications in fluvial hydraulics.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available in a repository or online in accordance with funder data retention policies. (https://www.researchgate.net/publication/359495805_data_Experimental_comparison_of_inclined_flows_with_and_without_intense_sediment_transport_flow_resistance_and_surface_elevation).
Acknowledgments
The investigations of the Prague research group has been supported by the Czech Science Foundation through the Grant Project No. 19-18411S. The assistance from T. Picek and L. Svoboda relative to the experiments is highly acknowledged. We thank the Editor, Fabian Bombardelli, the Associate Editor, Roberto Fernandez, and two anonymous reviewers for their constructive comments, which greatly improved this work.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 148 • Issue 12 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 21, 2021
Accepted: Jul 16, 2022
Published online: Sep 22, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 22, 2023
ASCE Technical Topics:
- Design (by type)
- Engineering fundamentals
- Flow (fluid dynamics)
- Flow measurement
- Flow resistance
- Fluid dynamics
- Fluid mechanics
- Hydration
- Hydrologic engineering
- Hydrologic properties
- Hydrology
- Laminating
- Load and resistance factor design
- Load factors
- Materials engineering
- Materials processing
- Measurement (by type)
- Overland flow
- River engineering
- Sediment
- Sediment transport
- Structural design
- Water and water resources
- Water management
- Water supply
- Water supply systems
- Water surface
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