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Lecture 4 Tides

Lecture 4 Tides. Tides. Three Players – Earth, Moon, Sun. -moon is the most important element. GRAVITATION. R. M. M.  M. Gravitational force =. G.  1/R 2. Gravitational bulge. Gravitational bulge. Centrifugal bulge. Gravitational force. B. A. C. •. •. •. •. •. •. Earth.

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Lecture 4 Tides

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  1. Lecture 4 Tides

  2. Tides

  3. Three Players – Earth, Moon, Sun

  4. -moon is the most important element

  5. GRAVITATION R M M  M Gravitational force = G  1/R2

  6. Gravitational bulge Gravitational bulge Centrifugal bulge

  7. Gravitational force B A C • • • • • • Earth Moon

  8. A little more reality Path of moon’s centre • Common centre of gravity Path of earth’s centre Both the earth and the moon revolve around their common centre of gravity

  9. A little more reality 1 Common centre of gravity 4 x 2 3 Path of earth’s centre

  10. A little more reality

  11. A little more reality

  12. Daily advance of peak tide

  13. Daily advance of peak tide

  14. Daily change of tide heights

  15. Daily change of tide heights

  16. Different tide cycles

  17. Different tide cycles

  18. Different tide cycles Diurnal Tide

  19. Different tide cycles Semidiurnal Tide

  20. Different tide cycles Mixed Semidiurnal Tide

  21. Different tide cycles

  22. Coriolus forces

  23. Coriolus forces

  24. Coriolus forces and gyres

  25. Coriolus forces and gyres

  26. Amphidromic points

  27. Amphidromic points - Animation

  28. Amphidromic Points - Gulf of St. Lawrence

  29. Tide Levels and Chart Datum Mhws - Mean High Water on the Spring tide Mhws - Mean Low Water on the Spring tide Mhws - Mean High Water on the Neaptide Mhws - Mean Low Water on the Neaptide Mtl - Mean Tide Level MHWS MHWN Neap Range Spring Range MTL MLWN MLWS Chart Datum

  30. Tidal Bore

  31. Bay of Fundy Tides

  32. Bay of Fundy Tides

  33. Bay of Fundy Tides

  34. Determination of Tide Level Primary port Secondary ports Finding the tide

  35. Tides and Weather

  36. Tides and Weather

  37. Tides and Weather

  38. Tides and Weather

  39. Tides and Weather Parlee Beach

  40. Tides and Weather Saxby Gale - 1869

  41. Hurricane Sandy

  42. Hurricane Sandy

  43. Hurricane Sandy

  44. Hurricane Sandy

  45. Next time Waves and Currents

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