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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : 3d culvert scour under non-full flowing condition
3d culvert scour under non-full flowing condition
Author : SHEAU MAAN TAN(1) & SIOW YONG LIM(2)
ABSTRACT
This paper presents the results of 3D culvert scour under non-full flowing condition. The local scour under non-full flow
culvert is different from the pressurized full-flowing jet in a conduit. The results from 62 non-full flowing culvert scour
experiments conducted in Nanyang Technological University (NTU) are presented. The experiments consist of water
issued from rectangular channels of different widths, ranging from 0.05 m to 0.16 m. The experiments used non-cohesive
sediments with median diameter (d50) ranging from 1.6 mm to 3.8 mm and the geometric standard deviation (σg) from 1.13
to 3.56. The flowrates and tailwater depths were varied systematically, and the experiments were run for sufficient time to
ensure equilibrium scour state was achieved. The characteristic length scales of scour hole at equilibrium state are the
maximum scour depth (dse), length (Lse), width (Wse), and volume of scour (Vse). The densimetric Froude number (Fo),
based on d50 and mean flow velocity (Uo), was found to be the dominant parameter to study the effects of varying d50 and
Uo on the scour hole dimensions. Generally, non-uniform sand produced smaller scour hole compared to uniform sand
under similar experimental conditions. Equilibrium scour hole dimension prediction equations based on dimensionless
analysis are proposed. The relative importance of other variables such as relative tailwater depth and channel width differs
among the different scour hole dimensions.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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