Results 261 to 270 of about 6,257,228 (299)
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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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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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Local and Contraction Scour at Bridge Abutments
Building Partnerships, 2000In most experimental studies on erosion at bridge piers and abutments, the value of the blockage ratio b/B between the transversal obstacle dimension and the flume width is kept as small as possible (typically b/B b is not small compared to B so that the average acceleration due to contraction is expected to increase the scour effects of the ...
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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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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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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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Similarity Laws for Localized Scour
Journal of the Hydraulics Division, 1966The object of this study is to develop similarity criteria for sediment-transport rate and for scour depth in localized-scour situations. The principal assumption is that in an area of localized scour, the velocity and velocity distribution are the results of the disturbance element around which scour was occurring.
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Local Scour Downstream of Hydraulic Structures
Journal of Hydraulic Engineering, 1995An analysis of the problem of local scour downstream of hydraulic structures is presented here. This paper briefly discusses the functional design of the bed protection downstream of large hydraulic structures. Phases of the scour process and transport mechanism are treated in an introductory manner.
Gijs J. C. M. Hoffmans +1 more
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2023
The investigation of flow intensity is crucial in understanding the ship propeller jet scouring process in ship manoeuvring areas, waterways path, and navigation channels. Although still water conditions are often used in studies, they do not accurately represent real‐life scenarios.
FERRARO Domenico +3 more
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The investigation of flow intensity is crucial in understanding the ship propeller jet scouring process in ship manoeuvring areas, waterways path, and navigation channels. Although still water conditions are often used in studies, they do not accurately represent real‐life scenarios.
FERRARO Domenico +3 more
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Local Scour at Bridge Abutments
Journal of Hydraulic Engineering, 1992Laboratory data for local scour depth at bridge abutments are presented. These include sufficient data to demonstrate the effects on scour depth of abutment length, flow depth, and abutment shape and alignment. In addition, some data for the effects of sediment characteristics, flow intensity, and approach channel geometry are given.
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