handout_tides

handout_tides - Tides * The lunar tide generating force is...

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Tides * The lunar tide generating force is due to the Moon's gravitational attraction on the earth's surface and the centrifugal force associated with the rotation of the earth-moon system . (Similarly, for the solar tide ) * The tide-generating effect of the Sun is ~ 50% as great as that of the Moon . * Three types of tides: diurnal tide , semidiurnal tide , and mixed tide . Tidal range is the difference between high- water and low-water. * Spring tide s (the times of greatest tidal range) occur during full and new Moons , while neap tide s (the times of least tidal range) occur during the 1st and 3rd quarter Moons . During spring tides, high tide is higher than normal, and low tide is lower than normal. During neap tides, high tide is lower than normal and low tide is higher than nor- mal. The greatest expanse of beach is exposed at low tide during spring tides. * The Moon does not maintain fixed position relative to the Earth. It moves from 28.5 o north of the equator to 28.5 o south of the equator each month. At intervals of about 18.5 years the plane of the moon’s orbit is in- clined 28.5 o relative to the plane of Earth’s equator. In order to be able to predict tides, one has to collect tidal observations over ~19 years. * The sun moves between 23.5
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handout_tides - Tides * The lunar tide generating force is...

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