GEOB 103 Lecture Notes - Lecture 10: Suspended Load, Large Woody Debris, Colluvium
14 Sep 2018
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Sediment is transported when the driving force (frictional force, drag force, lift force) exceeds the resisting forces (e. g. gravity) Sediment can move by different processes --> rolling, saltation, suspension. Rolling: regular driving forces cause the sediment to roll along the river bed. Suspension: when fine, light, particles are carried along the river bed. The way the flow erodes and mobilizes sediment is through the. Sediment is displaced when the applied shear stress is larger than the critical shear stress --> this induces motion. The ability of streamflow to displace or erode the material in it"s bed (i. e. to transport sediment/incisive bedrock) sediment/incisive bedrock) Water surface slope may be approximated by the channel slope. D50 --> represents the median diameter of the bed. Tc* --> shields parameter: when critical shear stress is dimensionless (there are no boundaries) For most sediment found in rivers, the shield"s parameter has a constant value of less than ~
