Tidal range | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Tidal_range


00:01:30 Geography
00:02:44 Classification



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SUMMARY
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Tidal range is the height difference between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun and the rotation of Earth. Tidal range is not constant but changes depending on the locations of the Moon and Sun.
The most extreme tidal range occurs during spring tides, when the gravitational forces of both the Moon and Sun are aligned (syzygy), reinforcing each other in the same direction (new moon) or in opposite directions (full moon). During neap tides, when the Moon and Sun's gravitational force vectors act in quadrature (making a right angle to the Earth's orbit), the difference between high and low tides is smaller. Neap tides occur during the first and last quarters of the Moon's phases. The largest annual tidal range can be expected around the time of the equinox if it coincides with a spring tide.
Tidal data for coastal areas is published by national hydrographic services. The data is based on astronomical phenomena and is predictable. Sustained storm-force winds blowing from one direction combined with low barometric pressure can increase the tidal range, particularly in narrow bays. Such weather-related effects on the tide, which can cause ranges in excess of predicted values and can cause localized flooding, are not calculable in advance.
Mean tidal range is calculated as the difference between Mean High Water (i.e., the average high tide level) and Mean Low Water (the average low tide level).