GEOG 1F91 Lecture Notes - Lecture 8: Dissolved Load, Suspended Load, Thalweg
3 Mar 2016
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Document Summary
Suspended load: fine material, within water column, ~90% Accumulation of eroded material on stream bed or floodplain. Dynamic- adjust to change in flow and sediment load. Pattern- straight rare (weakness in rock or human interference) sinuous flow. Highly variable discharge sediment deposit in bars that form multiple channels. Fluvial processes: meandering stream development redline = thalweg. Natural embankment flood-change in flow condtions= deposition vegetation stabilize. Fluvial processes: floodplain level area either side of river low gradient. Discharge overflows channel common and costly floodplains- flat area alongside channel sponge-water/sediment. Disrupted in urban areas manage storm water and development. Natural process essential characteristic factors topography, geology, vegetation, catchment size, state of the ground, precipitation, etc vary in magnitude and frequency. Human influence exacerbate frequency/magnitude, deforestation, floodplain drainage, urbanization, channel management. Move toward equilibrium variation smoothed out graded stream= equilibrium between gradient and sediment load graded/non-graded sections. Fluvial processes: terraces remnant of earlier floodplain cut into sediment.
