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T I D E S Tides
Tides • Tides are the periodic rise and fall of the water accompanying the tidal phenomenon. • They are results of the gravitational forces of theMoon & the Sun on the Earth. • The motions particularly responsible are: • the rotation of the Earth; • the revolution of the Moon about the Earth.
There are two bulges because of the differential gravitational forces. • The liquid at point A is closer to the Moon and experiences a larger gravitational force than the Earth at point B or the ocean at point C. • Because it experiences a larger attraction, it is pulled away from the Earth, toward the Moon, thus producing the bulge on the right side. • We may think of the bulge on the left side as arising because the Earth is pulled away from the water on that side because the gravitational force exerted by the Moon at point B is larger than that exerted at point C. • Then, as the Earth rotates under these bulges, a given point on the surface will experience two high and two low tides for each rotation of the planet.
A tidal bulge (a sudden temporary increase in the amount or level of something) occurs in the oceans on the side of the earth nearest the moon. • A second tidal bulge occurs on the far side of the earth. • These bulges are HIGH TIDES. The areas between the tidal bulges experience low tide.
What does the pull of the Moon do to the ocean? • Two types of tides are created: • high tide • low tide The rate of rise and fall is not uniform. • Stand - the period at high or low water during which there is no sensible change of level . • Range - the difference in height between consecutive high and low waters. • Tidal bulge - a sudden temporary increase in the amount or level of something. • Tidal lag - the interval between meridian passage of the moon and tide. • Flood – the movement to the shore. • Ebb - the movement away from the shore.
The solar tide • When the Sun, the Moon & the Earth are lined up, the Sun & the Moon exert their strength force together & tidal ranges are at their maximum. • When the Moon is located at right angles to the Earth-Sun line, the Sun & the Moon interfere with each other in producing tidal bulges & the tides are generally weaker. NeapTides Spring Tide