The deepest place in a riverbed or other reservoir, drilled by a whirlpool or current, is popularly called a pool. What is a depression in the bottom topography?
Types of whirlpool
The rotating water column can be observed on a variety of water bodies - on small rivers and in the open ocean. It is formed with a sudden expansion of the channel, with the collision of currents of different temperatures and speeds. Water, rotating in a small space, rushes to the outer edge of the cycle, forming a recess in the center. At sea, whirlpools arise when oncoming currents, tidal and ebb waves collide. The water in them can move at great speed. In the open ocean, the size of the formed funnel can reach several kilometers.
On a river, the speed of rotation of water is usually equal to the speed of its main flow. Vodoverti are quite typical for mountain rivers. They can form deep pits called suwodi. Here, the rotation of water occurs in one direction behind a pier, cape or other ledge. The flow usually moves from bottom to top along the axis of rotation of the whirlpool. Usually, a pool is found below the dam near the concave banks on steep bends. What is a natural phenomenon?This is a type of whirlpool in which the current is directed downward along the axis of the water cycle.
Whirlpools
The nature of their formation is due to the fact that the speed of the current throughout the river flow is rarely constant. It speeds up, slows down, sometimes almost disappears. There is also a reverse flow. In the section of the river called the rapid, it becomes very stormy and fast. The reason for this phenomenon is often the narrowing of the coast, steep slopes. The rapid current is accompanied by a kind of “boiling” of water on the rapids. Such whirlpools wash out a hole in the bottom, forming a pool. That such a place is dangerous - everyone knows. It is not without reason that the very word "whirlpool" is associated primarily with words fraught with danger: "bottomless", "deep", "dark".
Quiet water, deep pools
A person in a difficult situation or trouble is often compared to a person in a whirlpool. What is a recess in the relief of the bottom of the reservoir is better to bypass, even our ancestors knew. According to their beliefs, such a whirlpool often destroyed everything in its path, dragging small floating craft and ships into its mouth. The old sayings about pools have always been used as a warning about possible troubles. These are exactly the places where all evil spirits should be found. They kept away from such whirlpools, since it is not always possible to predict where under the water there is a funnel that can pull to the bottom. A lot of people drowned in the whirlpools, as they said earlier - the devils dragged them to the bottom.
Whirlpools may not represent a bigdangers, but they should not be underestimated. In calm water, the holes they form can be quite deep. Quiet whirlpools are often found on rifts and oxbow lakes. On the rifts, where it is shallow, the current is stormy and fast, and above the pool it is usually slow. The saying goes like this: “the water is still, but the pools are deep.”
