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Caspian Sea Tides

There are no significant tidal movements within the Caspian Sea, and therefore no tide time forecasts are available. According to the United Kingdom Hydrographic Office's Admiralty EasyTide ( service:

"All the tides we experience on Earth are generated in the Great Oceans as a result of their response to the tide raising forces generated by the gravitational attraction between the Earth, the Moon and the Sun.

If the natural resonance period of the body of water matches the frequency of the tide raising forces then it will respond accordingly and a tide is generated. For example, the Atlantic has a natural period of resonance in the order of 12.5 hours and so responds vigorously to the twice daily (semi-diurnal) tide raising forces. The Pacific on the other hand has a natural period of resonance closer to 25 hours and so responds vigorously to the daily (diurnal) tide raising forces. There are, of course, exceptions to both in unique locations in either ocean but to understand why you would need to consult any authoritative textbook on tidal theory.

Other large bodies of water such as the Baltic, Black Sea, Caspian Sea and indeed the Mediterranean do not have natural periods of resonance which align closely with either the diurnal or semi-diurnal tide raising forces. Hence they do not respond vigorously and, consequently, no significant tide is generated. They do respond marginally, however, but the tide is only what I would call centimetric and so we deem these areas to have no appreciable tide which for safe navigational purposes can be taken to be less than one foot or 0.3 metre."

Click here to read a pdf giving more information about Caspian Sea currents.

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