Experimental study on incipient shear stress of consolidated cohesive sediment
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ORIGINAL PAPER
Experimental study on incipient shear stress of consolidated cohesive sediment Caiwen Shu 1 & Guangming Tan 1 & Peng Chen 2 & Jun Wang 2 & Ping Lv 3 Received: 15 April 2019 / Accepted: 3 September 2020 / Published online: 15 September 2020 # The Author(s) 2020
Abstract This paper analyzes the incipient motion mechanism of consolidated cohesive sediment. An experimental device based on previous studies was designed to investigate the influencing factors of the incipient shear stress, including the consolidation time, the density of dry bulk, cohesive particles content, and the composition of sediment mixtures. The experimental results indicated that the incipient shear stress of cohesive sediment increased with the increase of consolidation time, dry bulk density, and content of cohesive particles. The incipient motion mechanism of cohesive particles was further investigated using experimental data and theoretical analysis. A formula of the incipient shear stress for cohesive sediment was proposed herein, which is related to both the content of cohesive particles and the relative dry bulk density. The proposed formula was validated by the experimental data, and the calculated values of incipient shear stress using the formula were in good agreement with the experimental results. Keywords Cohesive sediment . Incipient shear stress . Consolidation time . Dry bulk density . Incipient shear stress
Introduction Understanding the incipient motion of sediment particles in sediment transport is of vital scientific importance to understand the incipient threshold of different properties sediment Responsible Editor: Zeynal Abiddin Erguler * Caiwen Shu [email protected] * Peng Chen [email protected] Guangming Tan [email protected] Jun Wang [email protected] Ping Lv [email protected] 1
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2
Key Lab. of River Regulation and Flood Control of Ministry of Water Resources, Changjiang River Scientific Research Inst., Wuhan 430010, China
3
Anhui Bureau of Yangtze River Management, Wuhu 241000, China
under various flow conditions. Also, it is of practical importance for channel sediment transportation, bank stabilization, development and management of deltas and coasts, aggradation/erosion in the upstream and downstream of the reservoirs, and so forth. When the flow-induced shear stress exceeds a certain critical value, the bed particle begins to move, and the shear stress in this situation is defined as the incipient shear stress, which equals to component force of water weight on unit bed surface in the flow direction. Shields curve is widely known for commutating critical shear stress of uniform cohesionless sediment (Singh et al. 2017). However, the relationship between the cohesive of sediment particle and the range of consolidation has been neglect. Subsequently, the following model studies have been conducted to understand the characteristics of the incipient shear stress of consolidated cohe
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