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Understanding Tides: Equilibrium vs. Dynamic Theories

Explore the differences between Equilibrium and Dynamic Tide Theories, covering factors such as tidal bulges, ocean depth, landmass interference, and more. Discover the fascinating world of tides and their impact on Earth's oceans.

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Understanding Tides: Equilibrium vs. Dynamic Theories

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  1. TIDES

  2. Tides Equilibrium vs. Dynamic Theory • Equilibrium Tide Theory assumes: • Earth has 2 equal tidal bulges, toward & away from Moon • ocean covers entire Earth; has uniform depth • no friction between ocean & seafloor • continents have no influence

  3. Tides F=G m1m2 r2

  4. Tides

  5. Tides

  6. Tides

  7. Tides T=G m1m2 r3

  8. Tides T=-G m1m2 r3

  9. Tides

  10. Tides What about the Sun??? Isn’t it a lot bigger than the Moon???

  11. Tides T=G m1m2 r3

  12. Tides

  13. Tides

  14. Tides What is the wave period of a semidiurnal tidal wave? 12 hours, 25 minutes

  15. Tides ~50 minutes

  16. Tides Diurnal tides

  17. Tides

  18. Tides

  19. Tides

  20. Tides

  21. Tides 27 ½ day cycle Perigee + Spring tide = proxigean Effects of elliptical orbits

  22. Tides Dynamic Tide Theory: Tries to resolve differences between equilibrium predictions and actual observed behavior. Takes into account: • ocean depths (tides are shallow- water waves) • interference of landmasses • shape of ocean basins • effects of rotation (Coriolis effect) • + ~150 over factors

  23. Tides

  24. Tides

  25. Tides

  26. Tides

  27. Tides Tidal power installation, western France

  28. Tides Tidal bore – Qiantang River, China

  29. Tides Tidal bore, New Brunswick, Canada

  30. Tides Thames River, London – $1.3 billion tidal flood control barrier

  31. Tides

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