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15[1].3 Lecture

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Transcript

  • 1. Ocean Waves, Tides & Currents Chapter 15.3
  • 2. Goal 1 Explain waves in terms of energy movement versus molecule movement
  • 3. Wave Characteristics
    • http://en.wikipedia.org/wiki/Image:Elliptical_trajectory_on_ripples.png
    • Energy movement
    • Crest
    • Trough
    • Height
    • Length
      • Long = fast
  • 4. Wave movement animation
    • http://www.geo.wvu.edu/~donovan/geol101/animations/27.swf
    • Note the direction of energy movement and the movement of water molecules
  • 5.
    • Wave height
      • Wind speed
      • Wind duration
      • Fetch (size of body of water)
  • 6.
    • Breaking waves
      • Friction slows trough (bottom)
      • Crest (top) collapses forward
  • 7. Goal 2 Discuss how tides form
  • 8.
    • Tides
      • Varies by location, topography
      • Gravitational and Centrifugal forces
      • Moon, Sun
      • Earth
  • 9. Bay of Fundy Tide Video
    • http://www.gma.org/undersea_landscapes/Bay_of_Fundy/
    http://www.asf.ca/CommMedia/downld/mapna2.jpg
  • 10.
    • Spring tide
      • Full / new moon = highest high tide
    • Neap tide
      • First / last quarter = lowest high tide
  • 11. Spring and Neap Tides
    • www.decaelo.com/moongarden/ephemerides.htm
  • 12. Goal 3 Understand movement of water via ocean currents
  • 13.
    • Ocean currents
      • Density currents
        • Deep water / bottom currents
  • 14. Deep Ocean Currents
    • http://science.hq.nasa.gov/oceans/images/CONVEYOR.jpg
  • 15.
    • Surface currents
      • Driven by global wind systems
      • Predictable
        • Trade winds
        • Prevailing westerlies
        • Polar easterlies
  • 16.
    • Gyres
      • Continents deflect surface currents
      • Circular motion & Coriolis force
      • Northern Hemi = Clockwise
      • Southern Hemi = Counterclockwise
  • 17. Major Ocean Currents
    • US Navy Oceanographic Office
    • http://www.learner.org/jnorth/images/graphics/n-r/OceanCurrentsUSNOO.gif
  • 18.
    • Upwelling
      • Cold water deflects up continents
      • Pushed out by winds
      • West coasts & trade winds
      • Nutrient rich = fish
  • 19.  
  • 20.