10-OcFA11-Tides+WEB

10-OcFA11-Tides+WEB - TIDES -Tidal range can be as much as...

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TIDES -Tidal range can be as much as 15 m. -Good for ecosystem functioning. Disturbing force’ is the gravitational pull of moon and sun on ocean water Variations in gravitational pull across earth’s surface creates two tidal bulges Earth turns beneath the bulge High tide is the crest passing and Low tide is the trough of passing wave Wavelength = ½ circumference of earth (40,000/2 = 20,000 km) So, they are Shallow water waves: (Water depth always < 1/20 wavelength) (i.e. always shallower than 20,000km/20 = 1000 km) Gravitational attraction of the sun is 46% that of moon Sun creates smaller tidal bulges than the moon (gravitational and centrifugal) tidal period (time from one high tide to the next) Lunar Day = 24.8 h = 24 hr 50 min. So moon rises 50 min later each High Tide Low Tide Low Tide High Tide
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2 high, 2 low daily (e.g. Atlantic Coast) Mixed Tide: uneven 2 high, 2 low daily (e.g. Pacific Coast) Also Sometimes – Due to drag on
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This note was uploaded on 12/04/2011 for the course OCE 1001 taught by Professor Smith during the Fall '08 term at University of Florida.

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10-OcFA11-Tides+WEB - TIDES -Tidal range can be as much as...

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