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Sediment transport is basically a two-phase flow problem with air or water as the fluid phase and sediment particles as the solid phase. Sedimentation refers to the erosion, transport, and deposition of sediment, all of which are natural processes that have occurred throughout geologic time. Sedimentation continues to alter the terrain as well as the continental margin. Water, wind, and gravity all contribute to sediment movement. The practical technical necessity of flood control, erosion control, and river basin management, as well as the commercial interest linked with the exploitation of petroleum and other natural resources, drive interest in sediment transport. The study of sediment particle movement under the in influence of gravity and fluid drag is a fascinating subject.
In this chapter, focus primarily is given to sediment transport in rivers. The most common modes of sediment transport in rivers are bedload and suspended load. As bedload, sediment particles saltate, roll, and slide, but always staying close to the bed. As suspend load, sediment is carried by the fluid turbulence up in the water column. Procedure for analyzing sediment size distribution has been presented. Conditions for incipient sediment motion and significant suspension have been derived and the Shields diagram has been presented. Several relationships for bed load transport have been presented. The vertical distribution of sediment concentration under the equilibrium condition has been derived. Relations for the entrainment of sediment into suspension have been presented. Finally, resistance relations for calculating the bed shear stress have been presented.
Sediment transport is basically a two-phase flow problem with air or water as the fluid phase and sediment particles as the solid phase. Sedimentation refers to the erosion, transport, and deposition of sediment, all of which are natural processes that have occurred throughout geologic time. Sedimentation continues to alter the terrain as well as the continental margin. Water, wind, and gravity all contribute to sediment movement. The practical technical necessity of flood control, erosion control, and river basin management, as well as the commercial interest linked with the exploitation of petroleum and other natural resources, drive interest in sediment transport. The study of sediment particle movement under the in influence of gravity and fluid drag is a fascinating subject.
In this chapter, focus primarily is given to sediment transport in rivers. The most common modes of sediment transport in rivers are bedload and suspended load. As bedload, sediment particles saltate, roll, and slide, but always staying close to the bed. As suspend load, sediment is carried by the fluid turbulence up in the water column. Procedure for analyzing sediment size distribution has been presented. Conditions for incipient sediment motion and significant suspension have been derived and the Shields diagram has been presented. Several relationships for bed load transport have been presented. The vertical distribution of sediment concentration under the equilibrium condition has been derived. Relations for the entrainment of sediment into suspension have been presented. Finally, resistance relations for calculating the bed shear stress have been presented.
SEDIMENT TRANSPORT
Chaudhry, M. Hanif (author)
Open-Channel Flow ; Chapter: 17 ; 489-514
2022-01-01
26 pages
Article/Chapter (Book)
Electronic Resource
English
| Wiley | 2024
| Springer Verlag | 2008