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Introduction How Rivers Run Stories Value Of A River What We Can Do
Shape of a River - Geomorphology
Rates of change

Natural river channels change gradually over time. Banks scour. Bends increase. Oxbows form. Channels migrate.

Dramatic changes in the variables governing channel formation force rapid changes to the stream channel. Occasionally these changes are natural. A landslide may temporarily block the flow of a mountain stream and provide an abundant supply of sediment.

More often, dramatic changes in the factors governing channel formation are the result of human activities, such as dam construction or removal, channelization, or clearing of forest land.

Compare the rates of flow and the width of the channel in the two video clips below.

Luther Aadland
See Luther Aadland (video #1)
Straightened streams increase erosion

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Luther Aadland
See Luther Aadland (video #2)
Straightened streams homogenize habitat

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Introduction
Flow
Shape
Description
Variables
Bankfull flows
Classification
Sediment
Patterns
Slope
Habitat
Change
Consequences
Stories
Connections
Quality
Life
Summary
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