Results 261 to 270 of about 39,640 (314)

Local Scour at Complex Piers

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, Stephen Coleman, Stephen Priestley   +2 more
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Local and Contraction Scour at Bridge Abutments

Building Partnerships, 2000
In 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, 1981
A 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, George G. Hebaus, Clayton L. Anderson   +2 more
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Local scour in rivers

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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Similarity Laws for Localized Scour

Journal of the Hydraulics Division, 1966
The 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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Controlling Mechanism of Local Scouring

Journal of Hydraulic Engineering, 1990
Experimental 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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Local Scour at Bridge Abutments

Journal of Hydraulic Engineering, 1992
Laboratory 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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Local Scour Downstream of Hydraulic Structures

Journal of Hydraulic Engineering, 1995
An 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, Krystian W. Pilarczyk   +1 more
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Local Scour at Piled Bridge Foundations

Journal of Hydraulic Engineering, 1998
An experimental study of local scour around rectangular bridge piers founded on two circular cylindrical piles, where the piles are exposed as a result of scouring, is presented. The problem is the interaction of two widths (pier and piles) if the interface is set at different elevations with respect to the bed.
J. P. Martin-Vide, C. Hidalgo, A. Bateman   +2 more
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Local scour around bridge piers

Journal of Hydraulic Research, 1987
Local 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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