Estimation and Measurement of Bed Material Shear Stresses in Erosion Rate Testing Devices

Estimation and Measurement of Bed Material Shear Stresses in Erosion Rate Testing Devices

AbstractThe sediment erosion rate flume (SERF) is used to evaluate various methods to estimate shear stresses in a flume-style erosion rate testing device. Results show that direct shear stress measurements most closely correspond to shear stress estimates obtained from the Colebrook equation using...

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Veröffentlicht in:Journal of hydraulic engineering (New York, N.Y.) N.Y.), 2012-11, Vol.138 (11), p.990-994
Hauptverfasser: Crowley, Raphael W, Bloomquist, David, Hayne, James R, Holst, Courtney M, Shah, F. D
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Bridge elements
Bridges
Buildings. Public works
Devices
Earthwork. Foundations. Retaining walls
Erosion rate
Estimates
Exact sciences and technology
Geotechnics
Grain size
Mathematical analysis
Production methods
Sediments
Shear stress
Technical Note
Technical Notes
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Zusammenfassung:AbstractThe sediment erosion rate flume (SERF) is used to evaluate various methods to estimate shear stresses in a flume-style erosion rate testing device. Results show that direct shear stress measurements most closely correspond to shear stress estimates obtained from the Colebrook equation using a roughness height of approximately 77% of the sediment particle diameter. Using pressure drops to estimate shear stress appears to underestimate rough sample (grain sizes >0.25  mm) stresses. Likewise, smooth-wall assumptions and analytical methods also appear to produce lower than expected results for similar heights. Colebrook equation results should be interpreted as “instrument specific” because of the different devices’ hydraulic diameters.
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000608