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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Effect of deposition thickness on the incipient motion of sediments
Effect of deposition thickness on the incipient motion of sediments
Author : CHARLES HIN JOO BONG(1*), TZE LIANG LAU(2) & AMINUDDIN AB. GHANI(3)
ABSTRACT
The current literature on incipient motion are largely for loose boundary channel with unlimited depth of sediment as
compares to rigid boundary channel with limited sediment depth. A few existing literature for rigid boundary channel
suggested that the incipient motion value is substantially lower than for loose boundary channels for any particle size.
Some existing literature also shown that the current available equations for incipient motion in rigid boundary channel
became less accurate as the sediment deposition thickness increased. Nevertheless, the understanding on how the
deposition thickness could affect the incipient motion of sediment is still lacking in the literature and need further study.
The current study highlights the effect of sediment deposition thickness on incipient motion by conducting experimental
work in a rigid rectangular flume of 0.6 m wide. Results revealed that sediment deposits thickness have effect on the
incipient motion of the sediment particle at low sediment deposits thickness and the effect will diminished with the
increased in thickness of the sediment deposits. It was also observed from the current study that the sediment deposits
start to behave like a loose boundary for thickness above 48 mm. A new equation was proposed in the current study to
predict critical velocity during incipient motion by incorporating the sediment deposits thickness. This new equation
appears to be consistent and was not affected by the sediment deposits thickness and is an attempt toward unifying the
equations for both rigid boundary and loose boundary conditions.
File Size : 414,785 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 : 13/08/2015
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