River Bed Resistance Coefficient Variation of Different Sediment Particle Shapes
Publication: World Environmental and Water Resources Congress 2012: Crossing Boundaries
Abstract
In gravel bed rivers, the flow resistance is mostly due to grain roughness. Strickler was the first who determined the grain roughness coefficient in terms of sediment particle size. In the so called Strickler's formula, the Manning's coefficient has been related to only the median particle size ( n = cDS1/6 ). Therefore it is the purpose of this study to conduct experimental test to find out if the same sediment size but in different shapes, can produce different flow resistance and if so by how much. To reach such goals four different sizes of round sediment particles taken from natural river bed and four crushed sediment particles with the same sizes as river bed sediment were tested under constant flow conditions. The experimental tests were conducted in a 12 meter long flume of 25 centimeter wide. The energy gradient between the upstream and downstream stations was calculated by Bernoulli's equation. Then the roughness coefficient was computed using the Manning's formula. Comparison of the data shows that the particle shape can affect the particle roughness. The results also have been compared with the Strickler's type of equation and the best relations have been developed.
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Copyright
© 2012 American Society of Civil Engineers.
History
Published online: Jul 11, 2012
ASCE Technical Topics:
- Bed materials
- Design (by type)
- Earth materials
- Engineering fundamentals
- Engineering materials (by type)
- Flow (fluid dynamics)
- Flow resistance
- Fluid dynamics
- Fluid mechanics
- Geomaterials
- Geotechnical engineering
- Hydraulic engineering
- Hydraulic properties
- Hydraulic roughness
- Hydrologic engineering
- Load and resistance factor design
- Load factors
- Materials engineering
- Particle size distribution
- Particles
- River and stream beds
- River engineering
- Rivers and streams
- Sediment
- Structural design
- Water and water resources
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