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Erosional/Depositional Systems

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).

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Erosional/Depositional Systems

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  1. Erosional/Depositional Systems Running Water/Streams

  2. 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

  3. 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

  4. 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

  5. Velocity is dependent on: Gradient (slope) increases, Velocity increases • i. Gradient - Direct relationship

  6. ii. Discharge the amount of water

  7. Velocity is dependent on: • ii. discharge As discharge increases, velocity ____________ increases _________ relationship Direct

  8. 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)

  9. Meandering Streams

  10. Where is erosion greatest? Outside of Curve

  11. Where does the river flow fastest? Center down from surface

  12. Where is deposition greatest? Inside of Curve Mouth of River

  13. Why? lowest velocity

  14. iii. Channel Shape • Erosion on • Deposition on outside of the bend, greater velocity on the outside the inside, less velocity so particles are dropped

  15. DENT = DEPOSITION ELBOW = EROSION

  16. EROSION DEPOSITION

  17. What happens to particle size? Why? Decreases

  18. What happens to particle size? decreases, because the velocity decreases

  19. 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 increases Large

  20. EROSIONAL EFFECTS • A. Particles become round and smooth due to ____________ • B. V-shaped Valleys Abrasion

  21. c. Graded Bedding SmallParticles Slowest Velocity Fastest Velocity Big Particles

  22. c. Graded bedding

  23. Life Of A Stream NEW OLD MATURE

  24. Life of a Stream Oxbow Lake - cut off from main flow

  25. Oxbow Lakes

  26. Watershed - Area of land drained by one stream Where river begins Streams that flow into rivers Deposits atmouth of river A flat land next to a river that is subject to flooding

  27. 4,520 square miles of land area within New York State Chenango River (2,796 river/stream miles)

  28. delta What is this?

  29. large small

  30. http://www.youtube.com/watch?v=adlGxr7wovU

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