«Earth fell, the forest was gone.» As there are craters in the ground

© Photo : press service of EMERCOM of Russia in Nizhny Novgorod oblastyami karst collapse with a diameter of 32 meters and a depth of 50 meters in a farmer’s field in Shatkovsky district of Nizhny Novgorod region«Earth fell, the forest was gone.» As there are craters in the ground© Photo : press service of EMERCOM of Russia in Nizhny Novgorod oblationers to daily updates RIA Science

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A few days ago in Nizhny Novgorod region found a big hole in the ground. It is the result of karst processes — the leaching of rocks at depth. RIA Novosti together with the experts tells how such phenomena arise and how they are dangerous.

The hole in the hole

«I know of in the Nizhny Novgorod region the biggest failure of 115 meters in diameter, is near the village of Boldyrevo, Vorsmenskaya karst basin. In 2013, the City close to the railway formed the failure of about 60 meters in diameter», — says Mikhail Leonenko, Director of LLC «Dzerzhinsk karst laboratory».

His colleague had viewed the failure, discovered on July 24 in Shatkovsky district, near the village Aladino. Well that’s in the open field, where there are no people, no buildings. According to the MOE, the diameter of the hole is thirty meters, depth — about fifty.

«There is a natural process, no human influence is not, therefore, for scientists, this failure is of great interest,» said Leonenko.

The ground collapsed into a huge underground cavity with a volume of about forty thousand cubic meters. Now she has a vertical wall, but eventually they will crumble, and the pit will be conical.

Next to a fresh hole got older craters of the same nature, and in General this area is considered cortopassi. Failures of this magnitude happen in the Nizhny Novgorod region on average once a year. And, for example, in Dzerzhinsk district five times.

Natural karst processes develop thousands and millions of years. If they are imposed technogenic factors, for example, breakouts, hot water in the city, the intense exploitation of water wells, mine workings, failures may become more frequent. In the large cities of the Perm region — Berezniki and Solikamsk — they have become a real disaster.

«There’s a bath stood, water dripping into the trough and further eroded them,» suggests Sharapov.

The scientist draws attention to the fact that it happened just three and a half miles from the construction site of the future Nizhny Novgorod nuclear power plant near the village of monakovo and expresses concerns about the site selection. In the area on the surface more than six karst forms, and anthropogenic influence, according to Sharapova, may lead to destruction.

Mikhail Leonenko believes that the NPP has chosen the most stable area, according to regulatory documents.

«You’re not afraid to cross the road, although the chance to get under the car? So it is here. If the platform is sakartosanai territory, conduct special surveys. According to their results, prescribe measures to counteract threat processes. This may be monitoring, structural protection of structures, or plugging — download sand-clay mixture in the cavity. The risk is reduced to an acceptable level», — the expert concludes.

© Photo : R. V. Shurupoverty failure in the village Chud Nizhny Novgorod region, 2014«Earth fell, the forest was gone.» As there are craters in the ground© Photo : R. V. Shurupoverty failure in the village Chud Nizhny Novgorod region, 2014

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