Why does the swamp get sucked in?

A swamp that is sucked in is called a bog. It is capable of pulling only living objects. The bog is formed on the basis of lakes by overgrowing with a green carpet of moss and algae, not in all bogs.

The emergence of a swamp is facilitated by 2 reasons: overgrowing of a reservoir or waterlogging of land. The bog is characterized by excessive moisture, constant deposition of not completely decomposed organic matter - peat. Not all swamps are capable of sucking in objects, but only those in which the bog has formed.

A bog is formed on the site of a lake. Lilies, water lilies and reeds on the surface of the lake grow over time into a dense carpet on the surface of the reservoir. Along with this, algae grow at the bottom of the lake. As it forms, a cloud of algae and moss rises from the bottom to the surface. Due to the lack of oxygen, rotting begins, organic waste is formed, diverging in the water and forming a bog.

The bog sucks in living objects. This is explained by its physical properties. The bog belongs to the class of Bingham fluids, physically described by the Bingham-Shvedov equation. When lightweight objects hit the surface, they behave like solids, so the object will not sink. When the object is heavy enough, it sinks.

There are 2 types of diving: undersubs and oversubs. The behavior of a body trapped in a liquid is subject to the ratio of the effects of gravity and the buoyancy force of Archimedes. The body will sink into the quagmire until the strength of Archimedes is equal to his weight. If the buoyant force is less than the weight, then the object will be undersubmerged; if it is greater, then the object will be overloaded.

Why are only living objects subjected to overloading?

This is because such objects are constantly moving. What if you freeze? Will the dive stop? Alas, this will only slow down the immersion, because a living body always moves, as it breathes. Inanimate objects remain motionless, therefore they do not completely submerge.

Over-immersion in the bog is the suction of the bog. Why does the movement of the body accelerate the dive? Any movement is the application of a force that increases the force of pressure on the support. It is due to the weight of the object and the force of gravity. Sharp movements are the reason for the formation of areas of low pressure under the body. These areas will lead to an increase in atmospheric pressure on the living object, which will further submerge it.

Therefore, the physical definition of the word "swamp suction" looks like this: the Bingham fluid (bog), tries to transfer the living object that has fallen into it to a level below normal immersion, at which the Archimedes force is less than the body.

The suction process is irreversible. A drowned body will not emerge even after the cessation of vital activity.

  • In the photo: German soldiers in a swamp near the village of Myasnoy Bor, Novgorod Region.