Results 161 to 170 of about 107,957 (205)

Bed shear stress evaluation in combined sewers

Urban Water Journal, 2008
Experiments have been undertaken on two sewer trunk lines in order to identify an accurate and practical technique for estimating bed shear stresses in combined sewers. Various methods were tested to determine both local bed shear stress values (one based on the logarithmic velocity profile and the other on the Reynolds shear stress distribution) and ...
Oms, C., Gromaire, Marie-Christine, Milisic, V., Chebbo, G.   +3 more
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Measuring bed shear stress along vegetated river beds using FST-hemispheres

Journal of Environmental Management, 2008
The measurement of the bed shear stress along vegetated river beds is essential for accurately predicting the water level, velocity and solute and sediment transport fluxes in computational hydroenvironmental models. Details are given herein of an experimental and theoretical study to determine the bed boundary shear stress along vegetated river beds ...
B N, Bockelmann-Evans, R, Davies, R A, Falconer   +2 more
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Critical Bed Shear Stress for Unisize Sediment

Journal of Hydraulic Engineering, 2006
The overall, spatially averaged, mean magnitude of local, spatially averaged (over a small area enclosing the particles' projected area), instantaneous, critical Shields shear-stress parameters required for incipient motion of uniform-sized sand grains, independent of the bed shear-velocity particle Reynolds number, equal to 0.16, is obtained from ...
Oscar A. Sarmiento, Marco A. Falcon
openaire   +1 more source

Bed shear stress in non-uniform flow

Environmental Fluid Mechanics, 2016
Bed shear stress is an essential parameter in the description of flow motion and sediment transport. Several methods have been proposed to estimate bed shear stress under uniform flow conditions, yet few are applicable to non-uniform flow. A new approach is proposed to compute bed shear stress for non-uniform flow.
Xiao-Feng Zhang, Wen-Ting Yang, Jun-Qiang Xia   +2 more
openaire   +1 more source

Extreme bed shear stress during coastal downwelling

Ocean Dynamics, 2019
The wind-driven circulation of coastal oceans has been studied for many decades. Using a 2.5-dimensional hydrodynamic model, this work unravels new aspects inherent with this circulation. In agreement with previous studies, downwelling-favorable coastal winds create an overturning cross-shelf circulation that operates to mix nearshore water.
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Mobile‐Bed Friction at High Shear Stress

Journal of Hydraulic Engineering, 1989
Analysis demonstrates, and experiments confirm that the frictional behavior of mobile beds at high shear stress is inherently different from either of the two classical cases—smooth wall and rough wall. For those two cases, the characteristic lengths for friction are based on viscosity and grain size, respectively.
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River bed deformation calculated from boundary shear stress

Journal of Hydraulic Research, 2002
Deformation of various kinds of cross-sections was computed with the hypothesis that scour or deposition were directly related to shear stress computed by the Merged Perpendicular Method. Final stabilised cross section agrees with theoretical stable shape.
Paquier, André, Khodashenas, S.R.
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The Bed Shear Stress of an Annular Sea-Bed Flume

1990
An accurate estimation of erosion and deposition rates is very important in the study of fine, cohesive sediment transport. In. situ sea-bed flume tests would be the most reliable way to obtain these rates. Young and Southard (1978) used a sea-bed flume to study the incipient motion of sandy sediments.
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Bed Shear Stress and Scour over Bed‐Type River Intake

Journal of Hydraulic Engineering, 1991
Laboratory experiments are carried out to determine the increase in bed shear stress and local scour over the zone of suction associated with a bed-type river intake in a channel with a mobile bed. Bed shear stress is estimated first by observing the movement of indicator grains whose threshold shear stress in uniform flow was already known, and second
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Bed Shear Stress Distribution Around Offshore Gravity Foundations

Volume 7: Ocean Engineering, 2015
Offshore gravity foundations are often designed with complex geometries. Such structures interact with the local hydrodynamics and generate enhanced bed shear stresses and flow turbulence capable of scouring the seabed or destabilizing bed armour where deployed.
Nicholas S. Tavouktsoglou, John M. Harris, Richard R. Simons, Richard J. S. Whitehouse   +3 more
openaire   +1 more source