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Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
Naturalists at Large: Rivers watersheds
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Naturalists at Large: Rivers watersheds

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Naturalists at Large River and Watershed Slide show

Naturalists at Large River and Watershed Slide show

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  • 1. The streams found inmountains arelikely to have formed relatively recently.
  • 2. These young streamstypically have V-shaped valleys.
  • 3. The rivers tend to move fast in their upstream portions, although, someare slowed by the large rocks and boulders in the river channel.
  • 4. The young mountain streams tend to have asteep slope or gradient. Slope or Gradient
  • 5. Rivers move a great deal of material. The faster the watermoves, the larger material that can be carried down stream.
  • 6. Fast moving upstream portions can often move rocks and boulders. Downstream portions usually only transport small silts and clays.
  • 7. This process tends to sort materials by size. Have you ever wondered why we have so much silt and clay in our soil?
  • 8. Valleys with very steep,almost vertical sides arecalled canyons or gorges.
  • 9. How long do you think it took to form the Grand Canyon?
  • 10. Most scientists believe it took 1 to 3 million years!
  • 11. A stream or river can not cut its bed any lower than the body of water into which it flows. As the stream approaches this base level, the slope and speed of the stream decrease.
  • 12. The river channel becomes wider, deeper, and the volume is biggeras there are more tributariescontributing to the volume.
  • 13. The river valley also changes at this point. It becomes more open, more of a U shape with a wider river floor.
  • 14. The lower or downstream portion of the river is at its deepest, widest and slowest speed.It also has the largest volume and a very gentle gradient.
  • 15. The river valley tends to be broad, flat and bounded by bluffs. These bottom lands are often areas that flood.
  • 16. Lower portions of rivers often startto meander or form a s-shape river pattern.
  • 17. Erosion is greater on the outside of the bend, deposition more on the inside.
  • 18. The river can eventually cut through the meander, leaving a straighter section and an ox-bow lake.
  • 19. To view an animation of thisprocess click on this web site. http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21606
  • 20. Rivers deposit the sediment they have carried as they slow down. This sediment load will often form deltas as the river flows into the quiet waters of a bay or gulf.
  • 21. The river tends to be split into channels by its own deposits as it drops more sediment. As the deposits grow, they resemble the Greek letter ▲(delta).
  • 22. Alluvial FansAn alluvial fan differs from adelta in several ways.The deposit isformed on land, not in water.
  • 23. Alluvial Fans Also, the sediments of these depositsare coarse sands and gravels, rather than finesilts and clays of the deltas.
  • 24. Watershed A watershed, or drainage basin includes all of the land that drains into a river or bay either directly or through its tributaries.
  • 25. Watershed The high land that separates one river valley or watershed from the next, is called the divide.

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