Results 211 to 220 of about 2,024 (265)
Penetration explosion damage and discharge of high arch dam with high reservoir water level. [PDF]
Sci RepWu L, Wu A, Yu C, Huang R, Zhou J.
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Hydrotechnical Construction, 1975
Characteristic diagrams of the distribution of longitudinal velocities in the local scour zone at partly submerged obstructions are shown, and an equation is presented of dynamic balance of the flow around an obstruction during the the period of stabilization.
A. I. Bogomolov +4 more
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Characteristic diagrams of the distribution of longitudinal velocities in the local scour zone at partly submerged obstructions are shown, and an equation is presented of dynamic balance of the flow around an obstruction during the the period of stabilization.
A. I. Bogomolov +4 more
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Local Scour Downstream of an Apron
Journal of Hydraulic Engineering, 1985Measurements have been made of the rate of scour downstream of a rigid apron due to a jet of water issuing through a sluice opening. Experiments are carried out for various sand sizes, sluice openings, efflux velocities, and lengths of apron. Mean velocity profiles in rigid models simulating the shape of the scour hole are studied in detail.
N. M. K. Nik Hassan +1 more
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Journal of Hydraulic Research, 1992
Local scour downstream of an apron with a swept-out hydraulic jump is shown to develop very rapidly, that is in less than 1% of the time to reach the ultimate scour depth. The short-term scour although not as deep as the long-term scour, occurs much closer to the apron.
M. S. Mohamed, J. A. Mccorquodale
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Local scour downstream of an apron with a swept-out hydraulic jump is shown to develop very rapidly, that is in less than 1% of the time to reach the ultimate scour depth. The short-term scour although not as deep as the long-term scour, occurs much closer to the apron.
M. S. Mohamed, J. A. Mccorquodale
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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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