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

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Naturalists at Large: Rivers watersheds

  1. 1. The streams found inmountains arelikely to have formed relatively recently.
  2. 2. These young streamstypically have V-shaped valleys.
  3. 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. 4. The young mountain streams tend to have asteep slope or gradient. Slope or Gradient
  5. 5. Rivers move a great deal of material. The faster the watermoves, the larger material that can be carried down stream.
  6. 6. Fast moving upstream portions can often move rocks and boulders. Downstream portions usually only transport small silts and clays.
  7. 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. 8. Valleys with very steep,almost vertical sides arecalled canyons or gorges.
  9. 9. How long do you think it took to form the Grand Canyon?
  10. 10. Most scientists believe it took 1 to 3 million years!
  11. 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. 12. The river channel becomes wider, deeper, and the volume is biggeras there are more tributariescontributing to the volume.
  13. 13. The river valley also changes at this point. It becomes more open, more of a U shape with a wider river floor.
  14. 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. 15. The river valley tends to be broad, flat and bounded by bluffs. These bottom lands are often areas that flood.
  16. 16. Lower portions of rivers often startto meander or form a s-shape river pattern.
  17. 17. Erosion is greater on the outside of the bend, deposition more on the inside.
  18. 18. The river can eventually cut through the meander, leaving a straighter section and an ox-bow lake.
  19. 19. To view an animation of thisprocess click on this web site. http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21606
  20. 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. 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. 22. Alluvial FansAn alluvial fan differs from adelta in several ways.The deposit isformed on land, not in water.
  23. 23. Alluvial Fans Also, the sediments of these depositsare coarse sands and gravels, rather than finesilts and clays of the deltas.
  24. 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. 25. Watershed The high land that separates one river valley or watershed from the next, is called the divide.

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