(Turkish Chamber Civil Engineers, 2022) Mir Jafar Sadegh Safari; Wan Hanna Melini Wan Mohtar; Charles Bong Hin Joo; Aminuddin AB. GHANI; Aizat Mohd Taib; Haitham Afan; Ahmed El-Shafie; Taib, Aizat Mohd; Safari, Mir Jafar Sadegh; Ab Ghani, Aminuddin; Wan Mohtar, Wan Hanna Melini; Ab. Ghani, Aminuddin; Mohtar, Wan Hanna Melini Wan; Afan, Haitham Abdulmohsin; EL-SHAFIE, Ahmed; Joo, Charles Bong Hin; Ghanı, Aminuddin Ab.; Hin Joo Bong, Charles
This paper analyses experimental data on sediment incipient motion with varying sediment\rbed thickness (of d50 5 10 and 24 mm). Sediment particles (with sizes ranging from 0.5 mm\rto 4.78 mm) were used to evaluate the effect of deposited bed. Variation of shear velocity\restimation was investigated where the critical Shields parameter was expressed using bedslope product u∗cb log-law u∗cl and was extended in terms of critical mean velocity. The\rcritical Shields parameters obtained were significantly lower than the traditional Shields\rcurve when u∗cl was used compared to u∗cb. Higher critical mean velocity is needed for\rshallower deposits.
