Sediment Transport

Sediment Transport PowerPoint PPT Presentation


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Particle Transport and Movement. Transport of sediment involves 2 steps:Erosion and entrainment of sediment from the bedDowncurrent movementFollowed by:Settle out and deposition. Entrainment. Process involved in lifting resting grains from the bedThreshold of particle movementFunction of Cr

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Sediment Transport

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1. Sediment Transport Stream Ecosystems

2. Particle Transport and Movement Transport of sediment involves 2 steps: Erosion and entrainment of sediment from the bed Downcurrent movement Followed by: Settle out and deposition

3. Entrainment Process involved in lifting resting grains from the bed Threshold of particle movement Function of Critical Boundary Shear Stress

4. Particle Entrainment Critical threshold for grain movement Direct function of: Boundary shear stress Fluid viscosity Particle size, shape, and density Indirect function of: Flow velocity Varies as log of distance above bottom

5. Particle Entrainment F drag + F lift must overcome F gravity + F friction to initiate grain movement

6. Forces Initiating Grain Movement

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