Wan Hanna Melini Wan MohtarBong Charles Hin JooAminuddin Ab GhaniMir Jafar Sadegh SafariAizat Mohd TaibHaitham Abdulmohsin Abdulmohsin AfanAhmed Hussein A. El-Shafie2025-10-06202213003453, 030027211300-345310.18400/tekderg.572529https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106564610&doi=10.18400%2Ftekderg.572529&partnerID=40&md5=ffd31a250527bf48e5671cc70b51802bhttps://gcris.yasar.edu.tr/handle/123456789/8874This paper analyses experimental data on sediment incipient motion with varying sediment bed thickness (of d<inf>50</inf> 5 10 and 24 mm). Sediment particles (with sizes ranging from 0.5 mm to 4.78 mm) were used to evaluate the effect of deposited bed. Variation of shear velocity estimation was investigated where the critical Shields parameter was expressed using bed-slope product u∗<inf>cb</inf> log-law u∗<inf>cl</inf> and was extended in terms of critical mean velocity. The critical Shields parameters obtained were significantly lower than the traditional Shields curve when u∗<inf>cl</inf> was used compared to u∗<inf>cb</inf>. Higher critical mean velocity is needed for shallower deposits. © 2022 Elsevier B.V. All rights reserved.EnglishSediment Bed Thickness, Shields Parameter, Threshold Criteria Of Sediment Motion, Deposits, Particle Size Analysis, Shear Flow, Incipient Motion, Mean Velocities, Paper Analysis, Sediment Bed Thickness, Sediment Beds, Sediment Incipient, Sediment Motion, Shields Parameters, Threshold Criteria Of Sediment Motion, Threshold Criterion, SedimentsDeposits, Particle size analysis, Shear flow, Incipient motion, Mean velocities, Paper analysis, Sediment bed thickness, Sediment beds, Sediment incipient, Sediment motion, Shields parameters, Threshold criteria of sediment motion, Threshold criterion, SedimentsArticle