9_Tides_2 - Tides II Outline Tides Part I (Wednesday) Why...

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1 Tides II Outline Tides Part I (Wednesday) Why Study Tides Equilibrium Theory of Tides diurnal, semidiurnal and mixed semidiurnal tides spring and neap tides Tides Part II (Friday) Dynamic Theory of Tides rotary tidal motion larger tidal ranges in coastal versus open-ocean regions Special Cases Forcing ocean water into a narrow embayment Tidal forcing that is in resonance with the tide wave Why do we get ocean tides, but no tides in lakes and ponds? 1. The earth’s own gravity is always directed toward the center of the earth. 2. The earth’s gravity is only inline with the moon’s gravity directly below the moon it almost completely balances the upward pull of the moon’s gravity 3. The earth’s gravity is not inline to the moon’s gravity at locations not directly under the moon and so the earth’s gravity cannot counterbalance the moon’s gravity at these locations. 4. The result is that the ocean tides are pinched upward from the cumulative pull by the moon on all the ocean . 5. Lakes are not large enough to experience this broad pinch by the moon.
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2 Dynamic Model of Tides A More Realistic View of Tides Tide wave treated as a
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9_Tides_2 - Tides II Outline Tides Part I (Wednesday) Why...

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