Tides

Tide contrast, floods the shore, and raises high above the boat dock. In the mouths of some rivers burst creates a wave that rushes at great speed up the river, sometimes on the very far distance. This phenomenon is called boron. Bor River Petikodiak (North America) reaches a height of three meters. Where did come from the tides, and what forces cause them to an education? Tides are generated by the force of attraction of the Moon and the Sun, as well as the centrifugal force associated with rotation of a pair of Earth - the Moon around the common center of gravity. Mass of the Sun at 27 million times the mass of the moon. But at the same time it is 390 times farther from Earth than the moon. Therefore, on the surface of the Earth's gravity a small moon in 2,2 times bigger and stronger than the Sun. With the result that tides are caused primarily by the Moon. If the Sun and Moon are on the same line - and it happens during a full moon or new moon - the highest tide. It is called syzygial. The word "sizigita" in Greek means "a pairing, connection." And if both lights are located at 90 degrees - when there is a quarter moon - the lowest tide. It is called quadrature. The lowest tide on average 2.7 times less is more. Know the tide is very important. Especially in shipping. When approaching a large ship to shore, you can run aground or on the reef. Tide and time of the ebb and flow in different locations coast, calculated for the year ahead, so published in special books. But why the tide occurs twice a day? When researchers are interested in this, we found that while there is not one but two tidal waves on two opposite sides of the globe. Diurnal tidal period is equal to the lunar day, which is longer than solar for 50 minutes. Therefore, each next day tide occurs 50 minutes later. Tide is in the form of waves. Islands and continents that are located on a tidal wave, to alter the character of the tide. Therefore, some banks formed by the daily tide. This means that there is one lift and one of the lowering of a day. But in other places - the interim between the diurnal and semidiurnal. This is called a mixed tide. It is observed in the Far East coast. According to the theory of the highest tide should occur at the Moon passes through the meridian place (the highest position above the horizon). But the tidal wave behind the motion of the moon. Why? Because the wave undergoes friction on the bottom and meets in the way of obstacles - shoals, islands, continents. The lag depends on local conditions and can be large. In the White Sea, Arctic Ocean, it reaches five hours! In the open ocean scale tidal level fluctuations of less than one meter. And here is closer to the shores of the magnitude of the wave increases. Particularly high tides in the coves and bays that are open towards the ocean. They blow up water, tidal waves and currents. The highest tides on Earth are known in the Bay of Fundy in North America. There's the height of the level reaches 18 meters. At the mouth of the River Severn this marker reaches 16 meters. It is in England. But in France in the Bay of Mont Saint-Michel-15 meters, in the lips of the Okhotsk Sea-Penzhina and Gizhinskoy - 13 meters at Cape Nerpinsky Mezenski in Gulf - 11 meters. In our time in these places tested and put into operation plants using tidal energy.