1. Lecture 4 Tides

3. Three Players – Earth, Moon, Sun

4. -moon is the most important element

5. GRAVITATION G  M  1/R 2 Gravitational force = M M R

6. Gravitational bulge Centrifugal bulge

7. C BA Gravitational force EarthMoon

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

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

10. A little more reality

13. Daily advance of peak tide

15. Daily change of tide heights

17. Different tide cycles

19. Diurnal Tide

20. Different tide cycles Semidiurnal Tide

21. Different tide cycles Mixed Semidiurnal Tide

22. Different tide cycles

23. Coriolus forces

25. Coriolus forces and gyres

27. Amphidromic points

28. Amphidromic points - Animation

29. Amphidromic Points - Gulf of St. Lawrence

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

31. Tidal Bore

32. Bay of Fundy Tides

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

36. Tides and Weather

40. Parlee Beach

41. Tides and Weather Saxby Gale - 1869

42. Hurricane Sandy

46. Next time Waves and Currents