Results 261 to 270 of about 4,016 (315)
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World Environmental and Water Resource Congress 2006, 2006
A methodology to predict local scour depth at a complex pier is presented that recognises the relative scouring potentials of the components of complex piers, and the transition of scouring processes occurring for varying pile-cap elevation. Scour depths are predicted over the entire range of possible pile-cap elevations using a combination of existing
Bruce Melville +2 more
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A methodology to predict local scour depth at a complex pier is presented that recognises the relative scouring potentials of the components of complex piers, and the transition of scouring processes occurring for varying pile-cap elevation. Scour depths are predicted over the entire range of possible pile-cap elevations using a combination of existing
Bruce Melville +2 more
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Journal of Hydraulic Engineering, 1998
Dimensional analysis of the variables influencing local scour at skewed piers brings into issue the generality of skew factors apparently related only to skew angle, α, and pier aspect ratio, L/b, for a particular pier shape. This note discusses this issue and provides insights into flow-field and scour-geometry changes at skewed piers.
R. Ettema +3 more
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Dimensional analysis of the variables influencing local scour at skewed piers brings into issue the generality of skew factors apparently related only to skew angle, α, and pier aspect ratio, L/b, for a particular pier shape. This note discusses this issue and provides insights into flow-field and scour-geometry changes at skewed piers.
R. Ettema +3 more
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Local Scour Around Cylindrical Piers
Journal of Hydraulic Research, 1977A “state of the art“ report on the subject of local scour around cylindrical piers is given here. After a description of the scouring process, a critical review of literature on model and field data is presented, and the empirical data are compared with theoretical considerations.
H. N. C. Breusers +2 more
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Local scour around bridge piers
Journal of Hydraulic Research, 1987Local scour around cylindrical bridge piers in uniform, cohesionless sediment was investigated experimentally. Three empirical functions which relate equilibrium scour depth with approach velocity, sediment size and How depth were obtained. The variations of equilibrium scour depth with approach velocity show that the depth of scour decreases at ...
Y. M. Chiew, B. W. Melville
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Ultimate Dimensions of Local Scour
Journal of the Hydraulics Division, 1981A mathematical method is presented for determining the ultimate dimensions of local scour from relatively short term measurement of the progression of scour with time. The method involves plotting the logarithm of the rate of change of the scour dimension against the logarithm of time. A hyperbolic curve is fitted to the plotted data, and the asymptote
Fred W. Blaisdell +2 more
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Local scour around complex abutments
ISH Journal of Hydraulic Engineering, 2019Local scour around complex abutment and pier is the main reason for bridges to collapse. Although the complex abutment/pier has been used in most rivers, there is limited research in the literature...
Reza Mohammadpour +3 more
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Local Scour Around Bridge Piers
Journal of the Hydraulics Division, 1969Local scour caused by the horseshoe vortex system which forms at the base of the piers is considered. Piers which induce a pressure field strong enough to cause the formulation of the horseshoe vortex system are termed blunt nosed; all others being classed as sharp-nosed piers.
Hsieh W. Shen +2 more
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Journal of Geophysical Research, 1961
It has been found that the scour in rivers is influenced not only by water velocities but also by the curvature of streamlines. An obstacle with an arbitrary shape placed in a stream produces curvatures, which are the origin of a scour and which have an intensity expressed in terms of the velocity at the surface, the velocity in the neighborhood of the
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It has been found that the scour in rivers is influenced not only by water velocities but also by the curvature of streamlines. An obstacle with an arbitrary shape placed in a stream produces curvatures, which are the origin of a scour and which have an intensity expressed in terms of the velocity at the surface, the velocity in the neighborhood of the
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Overlooked Local Sediment Scour Mechanism
Transportation Research Record: Journal of the Transportation Research Board, 2004A heretofore overlooked mechanism is described for the removal of sediment in the vicinity of a structure, such as a bridge pier, located in erodible sediment and subjected to water flow. The strength of this mechanism depends on, among other things, the ratio of structure width to sediment grain size, b/D50.
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Controlling Mechanism of Local Scouring
Journal of Hydraulic Engineering, 1990Experimental study of clear water scouring around a circular cylinder shows that the scour mechanism is coupled to the three-dimensional separation of the upstream boundary layer and the periodic vortex shedding in the wake of the cylinder. The first scour appears in the wake of the cylinder.
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