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Ocean Tides

Is it true that tides are totally predictable?


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August 09, 2011 7:35AM

Mostly is the short answer. By far the majority of places have only two tides per day, so prediction is not difficult.

But when there are more than two tides per day, such as in Northern Australia, where the Indian Ocean and the Pacific ocean meet, the problem becomes more complex. Similar comments may be made about the English Channel where the tides also approach from up- or down- channel.

But the height of the tide is also affected by local atmospheric pressure, and a Low pressure system will raise the tide level.

And, the minor but real effects of Mars and Venus, when close to Earth cannot be ignored.