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34 Cards in this Set
- Front
- Back
What 2 processes affect erosion?
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Running water and abrasion
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What 2 processes affect velocity?
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Discharge and Gradient
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Describe the valley shape and gradient of a young stream
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V-shaped valley and a steep slope
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Describe the valley shpe and gradient of a middle aged stream.
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U-shped valley and a intermiediate slope
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Describe the valley shpae and gradient of an old stream.
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Elongated U-shaped valley and a flat slope
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What is teh difference between a delta and an alluvial fan?
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Delta- triangular shaped; forms at the mouth of a river that enter into a larger body of water
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What 2 things happen when a river wnters a larger body of water?
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1 slows down
2 deposits sediments 3 deposition is greater than erosion |
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What 4 characteristics seen in an old age stream
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Slow moving water
Flat large developed floodplain 4. Cutoffs and oxbow lakes form |
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what 3 effects will increased discharge have on a stream?
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More flooding
2. Increased volocity 3. More feature developement |
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as a river ages what happens to the velocity of water?
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sowns down
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What is gradient
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slope or steepness
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List the 3 different types of straamload
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Solution- 25 percent
Suspention- 50 percent Bedload- 25 percent |
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List 3 causes of man made flooding
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Development of urban areas
Logging and mining filling in swamps |
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List 4 features seen in a young stream
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Fast moving water, v- shaped valley, steep side, stright river bed
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List 4 features seen in a middle aged stream
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U-shaped valley, developed floodpaln, gentler slope, decreases in velocity
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What part of the meander does erosion occur?
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outside curve
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What part of the meander does deposition occur
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Inside curve
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List 2 causes of natural flooding
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Increased rainfall, snow melting, frozen ground
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What sized particles are found in solution, suspension and bedload?
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Solution- small (desolved) top of stream
Suspention- midium silt Bedload- bottom very larger boulders |
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where would you expect to find a cutoff forming?
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Between two meanders
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Describe 2 methods of flood control.
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Do nothing and farm on it after rain season
Build dams and levees |
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What is the least expensive use of flood plains?
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farming
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What is a levee?
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Elevated ridge along a river created by sediment deposition
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What is a backswamp
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area beyond a levees acts like a reciver for flood water.
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What part of the meander does erosion occur?
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outside curve
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What part of the meander does deposition occur
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Inside curve
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List 2 causes of natural flooding
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Increased rainfall, snow melting, frozen ground
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What sized particles are found in solution, suspension and bedload?
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Solution- small (desolved) top of stream
Suspention- midium silt Bedload- bottom very larger boulders |
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where would you expect to find a cutoff forming?
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Between two meanders
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Describe 2 methods of flood control.
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Do nothing and farm on it after rain season
Build dams and levees |
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What is the least expensive use of flood plains?
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farming
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What is a levee?
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Elevated ridge along a river created by sediment deposition
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What is a backswamp
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area beyond a levees acts like a reciver for flood water.
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What do you need to get into a good medschool
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an A in all science classes
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