The Euripus Strait - Chalkida and the Tidal Phenomenon

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from ...

http://www.skakistikiakadimia.gr/evia/item/58-h-xalkida-kai-to-palirroiko-fainomeno.html

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The Euripus Strait

Chalkida and the Tidal Phenomenon

It is useful for the visitor to know a few things about the legendary tidal phenomenon of the Strait of Euripus. There are many myths, but also the pursuit of life for many researchers, to explain its uniqueness. Those who believed that they explained it were left with the illusion and others realized the vastness and the unsolved.

The tidal phenomenon of Chalkida observed in the famous strait of Evripos is a rare phenomenon of changing the direction of the flow of sea currents. This phenomenon has aroused the admiration and interest of people since ancient times, both from an astronomical and geophysical point of view and from a philosophical point of view.

The point where there is the old bridge the visitor is dazzled observing the change of the direction of the water every (6) hours approximately, sometimes from the North Evia gulf towards the south and sometimes vice versa, and is the only culmination of the phenomenon where the The speed of the current reaches even 9 miles per hour and makes the tidal phenomenon even more noticeable, thus confirming the existence of the wonderful natural rules that operate within the laws of nature.

The flow of currents depends entirely on the moon and is directly related to the duration of each lunar month. The normal flow of current in one direction lasts (6) hours. This is immediately followed by a period of (8) minutes where the water remains stagnant. After the stagnation of (8) minutes the waters change direction and move completely opposite for a duration of (6) hours as well. This uninterrupted process between the centuries has no beginning and no end. It is a function that causes the famous flood and low tide of Euripus.

But as with any rule, there are exceptions, so the universe could not deviate from it.

During a lunar month (synodic month) there are periods of "disorder" as they are called where the currents do not have regular flows, do not obey any natural law, and of course the 6-hour alternation of their flow direction does not apply. Periods of "disorder" occur twice during the lunar month and last for a period of three days each time. During these periods it is possible for the water to change direction up to 14 times in 24 hours or otherwise no change will occur for an entire day.

The first period includes the 7th, 8th and 9th day of the Moon and the second the 21st, 22nd and 23rd day of the Moon. Thus in the first period the currents begin to become erratic, when the Moon is on its 6th to 7th day and return to Their 6-hour normal alternating flow when the Moon is on its 9th to 10th day. In the second period the currents become disordered on the 20th to 21st day of the Moon and return on the 23rd to 24th day of the Moon.

Each mess period starts at 00.01 on the first day and ends on the 24th winter hour of the last day.

But what gives the tidal phenomenon of Chalkida a global uniqueness is the fact that the 24th (winter) hour of the third and last day of each period of turbulence, ie the 9th and 23rd day of the Moon, seawater always begins to flow from the North to the South Evian gulf. Another interesting point that is also the second world uniqueness of the tidal phenomenon of Euripus and demonstrates the wonderful law of nature is that during the equinoxes, ie on March 21 and September 22, the currents change direction immediately without stagnation of about 8 minutes. as is the case on all other days of the year and have the greatest intensity.

Tidal phenomena occur in many parts of the world, such as the port of Dieppe on the English Channel, the Gulf of St. Malo, the coast of Brittany, eastern China caused by the Yangtze River and the coast of Patagonia.

The tide of Chalkida is the most classic example of a tidal current in a channel in the whole world with the uniqueness mentioned above. But another beautiful and picturesque phenomenon that the visitor will notice in the first two days after the end of each three-day mess, is that the strait of Evripos is filled with colorful fishing boats and traditional fishermen who support their fishing line on the beach railings and fill their baskets with the fruits of the sea.

This is because these two days when the waters do not gain much speed, the so-called "argoneria" (a term for fishermen and navigators), are considered suitable for fishing for sea bream, sea bass, gophers and other exquisite seafood that abound in the strait sea. Besides, the fish of the Gulf of Evia are famous for their taste throughout Greece. Frequent change of direction

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