06-RiversandDelta

06-RiversandDelta - River Discharge & Deltas R i v e r...

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River Discharge & Deltas
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River Deltas
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River Discharge • Discharge - Q S sediment, Q W water • Q = A x V, where A is Cross-sectional Area and V is Velocity Red lines indicate cross sectional area
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Freshwater discharge versus Sediment discharge Northern Rivers Qw Southern Rivers Qs
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East Coast Rivers • Northern Rivers - High freshwater discharge Q W - Low suspended loads Q S - Cause: Glacier stripped away Sediment Cover, low agriculture use
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Southern Rivers - Relatively Low freshwater discharge Q W - Relatively High suspended loads Q S - Cause: Thick Saprolites (weathered granite), High agricultural use
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Thick Saprolites (weathered granite)
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Sediment Load Bedload: Sediment moving Close to the bed (channel bottom) higher flow conditions • Suspended Load: Sediment moving downstream suspended in the water column weak flow conditions
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• Competency : Largest Sized sediment a flow can carry as flow Velocity Increases, so does Competency • Capacity : Volume of sediment a river can carry Capacity Increases with increasing Discharge and increasing Velocity
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This note was uploaded on 04/14/2011 for the course GEO 142 taught by Professor Fitzgereld during the Spring '11 term at BU.

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06-RiversandDelta - River Discharge & Deltas R i v e r...

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