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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Mitigation of local scour by using a training structure placed upstream of a spur dike
Mitigation of local scour by using a training structure placed upstream of a spur dike
Author : AKIHIRO TOMINAGA(1) & KAZUKI TOMIDA(2)
ABSTRACT
Recently, spur dikes are broadly used for environmental and ecological purposes. In order to use spur dikes for a long time,
it is necessary to investigate the method to prevent local scour around spur dikes. In this study, a lower-height structure
placed upstream zone of the spur dike is considered as a measure of mitigating local scour. This hydraulic structure is
called as a training structure. The relative height and location interval of the training structure with the target spur dike were
changed and their effects were investigated in a movable-bed condition. Then, the mechanism of reducing local scour by
the training structure was evaluated from the flow structures on a fixed bed experimentally and numerically. The scour
around the target spur dike becomes smaller with an increase of the height of training structure, but the local scour around
the training structure increases. Therefore the height of the training structure is adequate for 0.5 times of the height of the
target spur dike. The vorticity is concentrated in the gap when the interval length between training structure and spur dike
is too short, but the reduction effect decreases when the interval length is too long. The mechanism of reducing the scour
around the spur dike is not attributable to the flow structure on the flat bed but it is subjected to the bed deformation
process.
File Size : 1,984,050 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 12/08/2015
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