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THE RIVER PROFILE KEY WORDS

THE UPPER COURSE

Rapids Vshaped valley Vertical erosion

Abrasion Friction High wetted perimeter
Low velocity Potholes Large bedload
Angular boulders Active hillslopes Interlocking spurs
Steep gradient Low levels of discharge Narrow, shallow channel

THE MIDDLE COURSE

Bluff line Lateral erosion Higher velocity
Less friction Spurs…

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Particles are transported when the velocity drops below the level needed for
entrainment.

Erosion of the particle will occur when the velocity reaches a level higher than that
required for entrainment.

Deposition occurs when velocity drops below the level needed for transport.

DON'T FORGET: Clay particles require the same velocity…

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