tidvann

Tidvann is a Norwegian term referring to the tidal phenomenon observed along the coast and in certain fjords of Norway. It is the regular rise and fall of sea levels caused by the gravitational forces exerted by the Moon and the Sun. The amplitude, or difference between high and low tide, varies significantly depending on the geographical location. Coastal areas and open seas experience more pronounced tidal fluctuations compared to sheltered bays or inland waters.

The timing of tidvann is predictable and follows a lunar cycle. Typically, there are two high tides and two low tides within a 24-hour and 50-minute period. This slight excess over a standard day is due to the Moon's orbit around the Earth. The gravitational pull of the Moon creates bulges of water on both the side of the Earth facing the Moon and the opposite side. The Sun also contributes to this effect, though to a lesser extent. When the Sun, Moon, and Earth align, spring tides occur, resulting in the highest high tides and lowest low tides. Conversely, when the Sun and Moon are at right angles to the Earth, neap tides occur, with less extreme tidal ranges.

Tidvann plays a crucial role in coastal ecosystems, influencing the intertidal zone, a habitat exposed at low tide and submerged at high tide. It also affects navigation, fishing, and the design of coastal infrastructure. Understanding tidvann is essential for maritime activities and coastal management in Norway.