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34 Cards in this Set

  • Front
  • Back
What 2 processes affect erosion?
Running water and abrasion
What 2 processes affect velocity?
Discharge and Gradient
Describe the valley shape and gradient of a young stream
V-shaped valley and a steep slope
Describe the valley shpe and gradient of a middle aged stream.
U-shped valley and a intermiediate slope
Describe the valley shpae and gradient of an old stream.
Elongated U-shaped valley and a flat slope
What is teh difference between a delta and an alluvial fan?
Delta- triangular shaped; forms at the mouth of a river that enter into a larger body of water
What 2 things happen when a river wnters a larger body of water?
1 slows down

2 deposits sediments

3 deposition is greater than erosion
What 4 characteristics seen in an old age stream
Slow moving water

Flat

large developed floodplain

4. Cutoffs and oxbow lakes form
what 3 effects will increased discharge have on a stream?
More flooding

2. Increased volocity

3. More feature developement
as a river ages what happens to the velocity of water?
sowns down
What is gradient
slope or steepness
List the 3 different types of straamload
Solution- 25 percent

Suspention- 50 percent

Bedload- 25 percent
List 3 causes of man made flooding
Development of urban areas

Logging and mining

filling in swamps
List 4 features seen in a young stream
Fast moving water, v- shaped valley, steep side, stright river bed
List 4 features seen in a middle aged stream
U-shaped valley, developed floodpaln, gentler slope, decreases in velocity
What part of the meander does erosion occur?
outside curve
What part of the meander does deposition occur
Inside curve
List 2 causes of natural flooding
Increased rainfall, snow melting, frozen ground
What sized particles are found in solution, suspension and bedload?
Solution- small (desolved) top of stream

Suspention- midium silt

Bedload- bottom very larger boulders
where would you expect to find a cutoff forming?
Between two meanders
Describe 2 methods of flood control.
Do nothing and farm on it after rain season

Build dams and levees
What is the least expensive use of flood plains?
farming
What is a levee?
Elevated ridge along a river created by sediment deposition
What is a backswamp
area beyond a levees acts like a reciver for flood water.
What part of the meander does erosion occur?
outside curve
What part of the meander does deposition occur
Inside curve
List 2 causes of natural flooding
Increased rainfall, snow melting, frozen ground
What sized particles are found in solution, suspension and bedload?
Solution- small (desolved) top of stream

Suspention- midium silt

Bedload- bottom very larger boulders
where would you expect to find a cutoff forming?
Between two meanders
Describe 2 methods of flood control.
Do nothing and farm on it after rain season

Build dams and levees
What is the least expensive use of flood plains?
farming
What is a levee?
Elevated ridge along a river created by sediment deposition
What is a backswamp
area beyond a levees acts like a reciver for flood water.
What do you need to get into a good medschool
an A in all science classes