Lecture 4 Tides. Three Players – Earth, Moon, Sun.

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Presentation transcript:

Lecture 4 Tides

Three Players – Earth, Moon, Sun

-moon is the most important element

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

Gravitational bulge Centrifugal bulge

C BA Gravitational force EarthMoon

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

A little more reality x Common centre of gravity Path of earth’s centre

A little more reality

Daily advance of peak tide

Daily change of tide heights

Different tide cycles

Diurnal Tide

Different tide cycles Semidiurnal Tide

Different tide cycles Mixed Semidiurnal Tide

Different tide cycles

Coriolus forces

Coriolus forces and gyres

Amphidromic points

Amphidromic points - Animation

Amphidromic Points - Gulf of St. Lawrence

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

Tidal Bore

Bay of Fundy Tides

Determination of Tide Level Finding the tide Primary port Secondary ports

Tides and Weather

Parlee Beach

Tides and Weather Saxby Gale

Hurricane Sandy

Next time Waves and Currents