Results 221 to 230 of about 2,024 (265)

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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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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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 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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Model Studies on Local Scour

1984
The problem of local scour appears deceptively simple at the first sight, but continues to defy attempts of a rational solution. Due to the complex nature of the problem and a large number of variables involved a purely theoretical approach has been extremely difficult.
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Local Scour Around Cylindrical Piers

Journal of Hydraulic Research, 1977
A “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, G. Nicollet, H.W. Shen   +2 more
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Local Scour Around Bridge Piers

Journal of the Hydraulics Division, 1969
Local 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, Verne R. Schneider, Susumu Karaki   +2 more
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Local scour at open-channel junctions

Journal of Hydraulic Research, 2010
High bed-shear stress resulting from secondary flows and velocity increase at a channel junction cause local erosion and deposition in natural rivers and earth-lined channels. Herein, the scour patterns at the junction of two loose bed channels were studied under clear-water conditions.
S. Mahmood Borghei, Aidin Jabbari Sahebari   +1 more
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Local scour in waterway docks

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, LAURIA Agostino, PENNA Nadia, GAUDIO Roberto   +3 more
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Overlooked Local Sediment Scour Mechanism

Transportation Research Record: Journal of the Transportation Research Board, 2004
A 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/D 50
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