At Quiberville-sur-Mer, which is among the few beaches with the largest expanse of sand at low tide on the Alabaster Coast, it is sometimes necessary to walk for a long time on the pebbles and then the sand in order to reach the first waves. At high tide, the surface of pebbles decreases, bringing the sea closer to the bathers’ towels. This phenomenon that moves the sea away from and toward our pebble line is called the tide. It is due to the attraction of the moon on the sea.
But the Moon is not working alone in this story! The Sun, which also exerts an attraction on the Earth, adds its forces or subtracts them depending on its position relative to the Moon, which will affect the height of the water at low and high tide, which is called the tidal range. When the stars are coordinated, this tidal range is more important, we then speak of a Great Tide. This Great Tide is determined on paper by a coefficient. The higher it is, the larger the space between low and high tide will be. We speak of a great tide when this coefficient is greater than 100.