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geology_19 - Chapter 7 Rivers and Flooding cont River...

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Chapter 7: Rivers and Flooding cont. River dynamic characteristics: Velocity : Largely depending on stream gradient, discharge, channel shape, and turbulence Rock types along river channels River erosion: Erosion types Abrasion by sediments transported by river Hydraulic action of moving water Chemical corrosion Erosion location Down cutting Lateral: Concentrating on the outer bends Headward erosion River sediment deposition: Deposition Condition : The river flow slowing down Decrease of stream gradient Decrease of velocity Decrease of discharge Change of channel shape Change in the amount of stream load, e.g. land-use change Change of geologic setting, e.g., rock types along the river Deposition features Floodplain Natural levee Point bar Island bar Alluvial fan Delta Dynamics of river erosion and deposition: Ever-changing processes: Time and rate of erosion and deposition Reasons for the changes
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