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Saturday Sept 12th: Spring tides and sneaker waves

Saturday Sept 12th: Spring tides and sneaker waves . Functions. relation. function. linear function. Sine and cosine functions, oscillation period = 2 π. 0. 2 π. The unit circle. The addition rule. Wave superposition. 1 wave:. f = frequency. T =period= 1/f. h o = amplitude.

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Saturday Sept 12th: Spring tides and sneaker waves

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  1. Saturday Sept 12th:Spring tides and sneaker waves

  2. Functions relation function linear function

  3. Sine and cosine functions, oscillation period = 2π 0 2π

  4. The unit circle

  5. The addition rule

  6. Wave superposition 1 wave: f = frequency T=period=1/f ho = amplitude 2 waves: same amplitude (for simplicity) but different frequency

  7. Wave superposition 1 wave: Addition rule: f = frequency T=period=1/f ho = amplitude 2 waves:

  8. The Seventh Wave A product of sine and cosine with different frequencies

  9. Beats wave envelope = mean frequency fm = beat frequency fb

  10. WAVES ENVELOPE

  11. Beats = mean frequency fm = beat frequency fb

  12. Swell and sneaker waveson theOregon Coast Log carried by sneaker wave April 2007, Cannon Beach OR

  13. Sum of 9-second swell and 11-second swell Mean period = 9.9s Beat period = 49.5s

  14. Tides

  15. Lunar tides

  16. Lunar tides 2 bulges2 high tides per day Moon orbits Earth every 30 days Tidal frequency = 2/24hrs-1/30days =1/12.4hrs Tidal period = 12.4 hrs

  17. Solar tides Earth orbits Sun every 365 days Tidal frequency = 2/24hrs-1/365days =1/12.0hrs Tidal period = 12.0 hrs

  18. Spring tide Constructive interference Tidal range is HIGH OR

  19. Neap tide Destructive interference Tidal range is LOW

  20. Tides at Newport, Sept 12-20 2009 Sat 12 Sun 13 Mon 14 Tue 15 Wed16 Thu 17 Fri 18 Sat 19 Sun 20 Spring tides

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