title: Sediment deposit thickness and its effect on critical velocity for incipient motion.
abstract: The understanding of how the sediment deposit thickness influences the incipient motion characteristic is still lacking in the literature. Hence, the current study aims to determine the effect of sediment deposition thickness on the critical velocity for incipient motion. An incipient motion experiment was conducted in a rigid boundary rectangular flume of 0.6 m width with varying sediment deposition thickness. Findings from the experiment revealed that the densimetric Froude number has a logarithmic relationship with both the thickness ratios ts/d and ts/y0(ts: sediment deposit thickness; d: grain size; y0: normal flow depth). Multiple linear regression analysis was performed using the data from the current study to develop a new critical velocity equation by incorporating thickness ratios into the equation. The new equation can be used to predict critical velocity for incipient motion for both loose and rigid boundary conditions. The new critical velocity equation is an attempt toward unifying the equations for both rigid and loose boundary conditions.
authors: Department of Civil Engineering, Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak 94300, Malaysia E-mail: bhjcharles@unimas.my.
authors: C H J
authors: CH
authors: Bong
authors: School of Civil Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia.
authors: T L
authors: TL
authors: Lau
authors: River Engineering and Urban Drainage Research Centre (REDAC), Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia.
authors: A
authors: A
authors: Ab Ghani
authors: School of Humanities, Universiti Sains Malaysia, Penang 11800, Malaysia.
authors: N W
authors: NW
authors: Chan
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000032:analysis*; D016014:Linear Models; D014872:Water Movements