Results 171 to 180 of about 591 (207)

Jet Scour in Equilibrium Phase

Journal of Hydraulic Engineering, 1998
In this study a different approach has been used to compute the practical equilibrium scour process caused by both plunging and horizontal jets when no bed protection was present. Newton's second law of motion has been applied to a mass of particles of fluid to derive relations for the maximum scour depth in the equilibrium phase.
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Effect of Viscosity on the Equilibrium Scour Depth at Single Cylindrical Piers

Journal of Hydraulic Engineering, 2016
Most studies on scouring seem to have overlooked the effect of viscosity, the assumption being that the flow is free of viscous effects inside the scour hole because of the presence of highly turbulent flow structures such as down-flow, horseshoe vortex, and wake vortices irrespective of the approach flow regime. The present work reports the results of
Lança, Rui, Simarro, Gonzalo, Fael, Cristina, Cardoso, António   +3 more
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Prediction of equilibrium scour time around long abutments

Proceedings of the Institution of Civil Engineers - Water Management, 2013
Scouring around abutments and piers is a significant problem in bridge failure. The main objective of this study is to estimate the equilibrium time around long vertical abutments using genetic programming (GP). The data from a large number of clear-water scour experiments in uniform sand beds were collected for GP modelling techniques.
Reza Mohammadpour, Aminuddin Ab Ghani, Hazi Mohammad Azamathulla   +2 more
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Time to equilibrium scour at vertical-wall bridge abutments

Proceedings of the Institution of Civil Engineers - Water Management, 2010
The main objective of this study was the definition of a predictor of time to equilibrium on the basis of experimental evidence. The study used the results of an important number of long-lasting experiments, run under clear-water flow conditions for large abutment lengths. These experiments have already been reported by the present authors in recently
A. H. Cardoso, C. M. S. Fael
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Equilibrium Clear-Water Scour around an Abutment

Journal of Hydraulic Engineering, 1997
The author presents a semiempirical analysis of equilibrium local clear-water scour at a bridge abutment that is based on the flow-continuity equation, scour geometry, and a generalized form of the power-law formula for flow resistance in an alluvial channel.
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Equilibrium Scour Downstream of Three-Dimensional Grade-Control Structures

Journal of Hydraulic Engineering, 2012
To promote grade-control, bank stability, and fish habitat enhancement, three-dimensional structures installed within river channels are becoming increasingly popular choices for rehabilitation. A-, U-, and W-shaped rock weirs are commonly used in streams, yet three-dimensional scour holes develop downstream of the weir crest and often undermine the ...
S. Michael Scurlock, Christopher I. Thornton, Steven R. Abt   +2 more
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Physics-based unified formulation for predicting clear-water equilibrium scour depth and scour threshold velocity around piles

Coastal Engineering
Fu-Ping Gao, Wengang Qi, Shun-Yi Wang
exaly   +2 more sources

Equilibrium Profile of Current-Induced Scour Around Submarine Pipelines

Volume 4: Terry Jones Pipeline Technology; Ocean Space Utilization; CFD and VIV Symposium, 2006
Submarine pipelines installed on seabed disturb the local flow field and bring imbalance in local sediment transport that leads to scouring. Local scouring can leave the pipeline unsupported in significant distances. The free spans of the pipeline are susceptible to damages arising from environmental forces or human activities.
Mir Emad Mousavi, Abbas Yeganeh Bakhtiary, Nastaran Enshaei   +2 more
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Prediction of Equilibrium Local Scour Depth at Complex Bridge Piers

Journal of Hydraulic Engineering, 2016
AbstractAt present, bridges are frequently built with geometries that consist of a column founded on a pile cap and supported by an array of piles, referred to as common complex piers or most often (as also in this paper), briefly, as complex piers. This paper addresses prediction of local scour depth at those complex piers. An experimental campaign of
Mario Moreno, Rodrigo Maia, Lúcia Couto
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4—AQUEOUS JET SCOURING OF RAW WOOL: PART V. CONTINUOUS SCOURING—THE APPROACH TO EQUILIBRIUM

Journal of the Textile Institute, 1967
Expressions are derived that describe the changes taking place in a steady-state scouring system during the approach to equilibrium. The expressions are used to predict the behaviour of commercial scouring machines under various conditions.
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