Ocean Tides - PowerPoint PPT Presentation

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Ocean Tides

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    1. Ocean Tides An ocean tide refers to the cyclic rise and fall of seawater. Tides are caused by slight variations in gravitational attraction between the Earth and the moon and the sun in geometric relationship with locations on the Earth's surface. Tides are periodic primarily because of the cyclical influence of the Earth's rotation.

    2. St. Michel, N. coast of France ~16.8 m highest tidal range in Nova Scotia

    3. Nova Scotia Tides Wolfville, NS (16 m tidal range) Diurnal Tides (one high and one low every 12 hours and 25 minutes

    4. Second highest tidal range at Ancorage Alaska ~ 12 m

    5. Variable Tides

    6. Lunar and Solar Parallax

    7. Types of Tides

    8. Spring and Neap Tides

    9. Semidiurnal, Mixed and Diurnal Tides

    10. Tidal Ranges Around the Globe

    11. Tides Around the Globe

    12. Tide Curve off Grand Isle

    13. Inlets/Inlet Morphology Inlet Dynamics determined by Tidal currents Wave currents

    14. Tidal Prism/X-Sectional Area TIDAL PRISM Total amount of H2O flowing into or out of an inlet with the rise and fall of the tide.

    16. Inlet By-Passing of Sediment (Bruun, 1966)

    17. Sediment Sources for Ebb Shoals Longshore transport Onshore transport Inlet gorge

    19. Hypopycnal Flow

    22. An Idealized Inlet

    23. An Inlet System Showing Diversion of Littoral Drift

    24. Types of Ebb Tidal Deltas (after Oertel, 1975)