topic: erosion & running water
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Topic: Erosion & Running Water. * Earth’s main agent of natural erosion. What is erosion?. Erosion is -. Agents of Erosion. Agents of erosion include -- Running water is the big Kahuna of all erosional agents. . How does water carry the sediments?. - PowerPoint PPT PresentationTRANSCRIPT
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Topic: Erosion & Running Water
* Earth’s main agent of natural erosion
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What is erosion?
• Erosion is -
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Agents of Erosion
• Agents of erosion include --• Running water is the big Kahuna of all
erosional agents.
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How does water carry the sediments?
• Water carries sediments in the following ways:–Solution – -–Suspension – -–Rolling or bouncing along the streambed.–Floating – -
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River Floor
Flow of the River
Cobbles & PebblesMove by sliding, rolling along the river floorSlower than the water flow
SandBounces along river floorSlower than the water flow
Colloids (Silt & Clay) & Dissolved IonsCarried in suspensionSame speed as water
Streams act as conveyor belts
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Lake
Ocean
Stream Side ViewGreatest Potential Energy = Stored Energy
Greatest Kinetic Energy = Energy of Motion
Low Kinetic & Potential Energy
Most Erosion
Most Deposition
Dynamic EquilibriumRate of Erosion = -
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Changing Stream Velocity:
• A. --• B. --
Stream velocity determines size of sediment carried.
ESRT pg 6 Take out your ESRT!
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Streambed--
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--
Stream bank
Stream bank
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Region of maximum stream velocity changes when streams bend or turn.
Stream
Region of maximum velocity shifts to --
Region of minimum velocity shifts to --
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Since the region of maximum stream velocity is at the outside of the curves, streambeds are more eroded at the outside of curves.
Stream
A
A’
B
B’
C’C
AA’Streambed
B’ B
StreambedC C’Stream
bed
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What does erosion by rivers create?
• Abraded sediments– --
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FQ
The stream’s velocity is 100 cm/sec, what size sediment(s) can the stream transport?
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Topic: Life Cycle of a Stream
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Youthful Stream
Steep Slope Rapid
Flow
Lake
(Source of Water)
Rapids
Waterfall
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This forms V-shaped valleys.
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** ---**
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Middle AgeVelocity decreases
due to decrease in slope
Downcutting slows due to velocity decrease
Valley walls become wider
Begins to meander
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Old Age Stream Slow speed
Almost flat slope
Very little erosion
Wide meanders
Oxbow lake
Wide flood plain
Very broad, flat valley (flood plain) filled with fine sediments - alluvium
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Meander – --
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Oxbow lake – --
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Rejuvenation – a stream may be brought back to a youthful stage of development at any time by uplifting the land.
(ex. Grand Canyon)
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Name the part of the stream’s life cycle in the
picture
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FQ:What shape do stream valleys make?
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