A Text-Book of General Astronomy for Colleges And Scientific Schools
A Text-Book of General Astronomy for Colleges And Scientific Schools
Charles a Charles Augustus Young
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In the La Plata and Amazon it goes up to an elevation at least one hundred feet above the sea-level. The velocity of the tide wave in a river seldom exceeds ten or twenty miles an hour, and is usually less. 478. Height of Tides. In mid-ocean the difference between high and low water is usually between two and three feet, as observed on isolated deep-water islands in the Pacific ; but on the continental shores the height is usually much greater. As soon as the tide wave ^ ^ ^ ^-g^ _ A A A r n D ...V y V FIG. 157. Increase in Height of Tide on approaching the Shore. touches bottom, so to speak, the velocity is diminished and the height of the wave is increased, something as in the annexed figure (Fig. 157). Theoretically the height varies inversely as the fourth root of the depth. Thus, where the water is 100 feet deep, the tide wave should be twice as high as at the depth of 1600 feet. Where the configuration of the shore forces the wave into a corner, it sometimes becomes very high. At the head of the Bay of Fundy, tides of seventy feet are not very uncommon, and an altitude of nearly a hundred feet is said to be occasionally attained.
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