Computational Modeling of Bed Material Shear Stresses in Piston-Type Erosion Rate Testing Devices

Crowley, Raphael; Robeck, Corbin; Thieke, Robert J.

doi:10.1061/(asce)hy.1943-7900.0000797

Cited by 15 publications

(2 citation statements)

References 19 publications

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“…Uncertainty in measuring erosion rate using experimental results from small soil samples may also be an issue. Common irregular erosion patterns at the surface of the sample may result in considerable uncertainty in estimating the applied shear stress over a soil sample due to the roughness variation over the sample surface (Crowley et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimating cohesive sediment erosion and deposition rates in wide rivers

2016

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Sediment erosion and deposition rates are two of the most important factors that influence fluvial geomorphology. Several experimental devices have been constructed to estimate cohesive sediment erosion rate. However, estimated erosion rates may not be reliable for large rivers due to limited soil sampling and a high dependency of cohesive sediment behaviour on several physical, mechanical, and electrochemical properties of the sediment and eroding fluid. A new methodology has been developed to estimate the erosion and deposition rate of wide rivers using in situ measurements. To test this methodology, an acoustic Doppler current profiler was used to collect bathymetry and velocity profiles over a study area along the Red River in Winnipeg, Canada. Sediment concentration profiles along an 8.5 km reach of the river were measured several times under different flow conditions. Finally, an advection–dispersion equation was numerically solved using measured and calculated streamwise dispersion coefficients, flow and channel characteristics to calculate net erosion and deposition over the study area. Moreover, an exponential relationship was obtained between the river discharge and longitudinal dispersion coefficient for the Red River.

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Section: Introductionmentioning

confidence: 99%

Estimating cohesive sediment erosion and deposition rates in wide rivers

2016

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“…Crowley [19] introduced the sediment erosion rate flume (SERF) device to measure the bed material shear stress. The SERF is a rectangular circulating flume with an eroding sample section located in the centre of the rectangular portion of the flume.…”

Section: Previous Development Of Erosion Apparatusmentioning

confidence: 99%

Hydrodynamic investigation of fluvial sediment transport with Soil Protrusion Apparatus (SPA)

Jayaratne

Salim

2014

Open Engineering

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Abstract:In order to understand sediment transport process based on knowledge of their soil properties and hydrodynamic behaviour a series of 2D laboratory controlled small-scale experiments were conducted using the Ahlborn sediment mobile bed tank (4.0×0.6×0.2 m). Experiments were conducted in smooth and rough bed conditions with purposely-built Soil Protrusion Apparatus (SPA) to measure the basic parameters on which erosion depends. Sediment deposition patterns in equilibrium stage associated with different bed roughness and particle size distributions were fundamentally investigated. Extended physical modelling of crescent zones also included analysing their grain size distribution. Dimensional analysis and multiple linear regression methods were employed to derive a simple empirical relationship for erosion rate (ER) in terms of the shear stress (τs), average grain diameter (d 50 ) and soil protrusion (z) for smooth and rough sediment bed conditions. These analyses also suggest ways to refine empirical models, examining transport rates to explore the limits of erosion and deposition influences in shallow flow conditions.

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