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Ch 11 TidesCauseVariations with timeVariations with locationDynamic vs. equilibrium model

50 ft difference between high and low tide at the Bay of Fundy, Canada ... Blue smallest tidal range of crest amplitude. Red highest tidal range of crest ...

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Ch 11 TidesCauseVariations with timeVariations with locationDynamic vs. equilibrium model

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    Ch 11 Tides Cause Variations with time Variations with location Dynamic vs. equilibrium model 50 ft difference between high and low tide at the Bay of Fundy, Canada Low tide High tide (photos from Monroe and Wicander, 2001) Flood tide Ebb tide Slack tide Gravitational force Gravity of moon on water FT = G m1 m2 r3 Inertia Tides: equilibrium theory Tidal day Affect of moon’s orbit : elliptic Moon above equator Moon 28 1/2o north of equator equator December Affect of elliptical orbit Sun Aphelion Perihelion Moon Apogee Perigee Earth and Sun in line Earth and Sun in line Australia and New York not shown for same time period Earth and Sun in line Earth and Sun in line days days Dynamic theory of tides Semidiurnal tide Diurnal tide Mixed tide Geographic distribution of three tide patterns Amphidromic point Link: http://www.es.flinders.edu.au/%7Emattom/IntroOc/lecture11.html

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    Amphidromic points of earth Blue – smallest tidal range of crest amplitude Red – highest tidal range of crest amplitude Ideal amphidromic point in wide confined basin Actual amphidromic point at Southeastern Canada Gulf of St. Lawrence Ideal tide in narrow confined basin Actual tide in confined basin in Southeastern Canada Bay of Fundy Low tide High tide Tidal Bore in Qiantang River, China Intertidal zone Grunion run to spawn eggs on Pacific Coast during spring and summer

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