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Erosional/Depositional Systems. Running Water/Streams. Running Water/Streams. a. Carrying Power –. How much material can the stream hold. 1. Solution – dissolved particles. 2. Suspension – carrying of fine sediments (they are suspended in water). - PowerPoint PPT Presentation
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Erosional/Depositional Systems
Running Water/Streams
Running Water/Streams
a. Carrying Power – How much material can the stream hold
1. Solution – dissolved particles
2. Suspension – carrying of fine sediments (they are suspended in water)
3. rolling, sliding or bouncing along the bottom >> Bedload
Velocity of a Stream = speed
• The _________ the stream, the ______ it can carry
• ESRT Page __
• When a stream slows down, it loses its carrying power and particles are deposited
faster more
6
What’s the minimum speed water needs to be moving in order to transport sand? _________
In order to move a particle that is 7.0 cm, a stream’s velocity would need to be at least _________ cm/sec
0.3 cm/sec
200
Velocity is dependent on:• i. Gradient - Gradient (slope) increases,
Velocity increasesDirect relationship
Velocity is dependent on:
• ii. discharge
As discharge increases, velocity ____________increases
_________ relationshipDirect
Velocity is dependent on:
• iii. Channel Shape
• Meander = curve of stream or river
• If a stream is meandering, then velocity is greatest on the outside
• If stream is straight, velocity is greatest in the center just below surface (less friction)
iii. Channel Shape
outside of the bend, greater velocity on the outside
the inside, less velocity so particles are dropped
• Erosion on
• Deposition on
ELBOW = EROSION
DENT = DEPOSITION
EROSION
DEPOSITION
What happens when a stream reaches a large body of water?
High potential energy(top of hill) Mouth - where river enters ocean
Low potential energy,low velocity
Velocity __________ as distance from the mouth ________, ______ particles settle out first
decreases increasesLarge
EROSIONAL EFFECTS
• A. Particles become round and smooth due to ____________
• B. V-shaped ValleysAbrasion
c. Graded Bedding
Fastest Velocity
Slowest Velocity
Big Particles
SmallParticles
c. Graded bedding
Life Of A Stream
NEW MATURE OLD
Life of a Stream
Oxbow Lake - cut off from main flow
Watershed - Area of land drained by one stream
Deposits atmouth of river
A flat land next to a river that is subject to flooding
Where river begins
Streams that flow into rivers
• 4,520 square miles of land area within New York State
Chenango River (2,796 river/stream miles)
• http://www.youtube.com/watch?v=adlGxr7wovU
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