(,rivers, brooks, creeks, etc.)

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Erosion and Deposition

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Presentation transcript:

(,rivers, brooks, creeks, etc.) Streams (,rivers, brooks, creeks, etc.)

Processes Erosion Deposition

Loads Bed load Suspended load Dissolved load gravel rounder with greater working Suspended load silt Dissolved load salt, lime

Load Carrying Capacity Higher velocity flow allow stream to carry: larger particles more total load per volume

What Happens When Deposition when flow slows New erosion when flow speeds up

Sorting Velocity changes gradually Slowing: deposit heaviest load Speeding: remove lightest substrate Result: particles of same size found together (sorted)

Common Profile Steep and fast in headwaters Slower near base Cannot excavate below base level

Drainage Patterns Determined by substrate characteristics Trellis Dendritic Radial

Stream Features

Headlands V-shaped valleys Erosion dominates Alluvial fan at foot of mountain

Bottomlands Flat valleys Deposition dominates BUT—flow is variable

Bottomland Features Floodplains Meanders Oxbows Levees Yazoo streams

Meanders Erosion on outside Deposition on inside cutoffs Oxbows cut bank Deposition on inside point bar cutoffs Oxbows

Meandering River

Meander Evolution

Meander Evolution

Meander Evolution

Meander Evolution

Meander Evolution

Meander Evolution

Meander Evolution

Meander cutoff

Oxbow lake

Floods Normal Bank-full discharge ~ 2 years Deposit on levees, flood plains

Meandering river flooding

Base Level Delta: deposits choke with sediment many distributary channels lobes shift old sediments subside