The most prominent of them is Kochechum, which joins it from the north near Tura. In a whole, the right tributaries of Lower Tunguska dominate over left inflows adding a greater amount of water to the river than the left one. Incoming amount of water to Nizhnyaya Tunguska is strongly season dependant. The value of average water discharge of Lower Tunguska gives it eleventh place amongst largest rivers of Russia. Water supply of the river is due to melting snow and summer rains.
During winter season Lower Tunguska contains little water as its basin lies in the region of permafrost and it has not subterranean water sources. According hydrological observations during 52 years, the minimum average monthly discharge was equal to The 73 per cent of entire annual water yield corresponds to the period of spring-summer season. The amplitude of water level variations in the lower stream of Nizhnyaya Tunguska is very high and is highest among all notable rivers of Russia.
The narrow places of river channel jam ice during its seasonal drift creating temporal dams which blocks normal water flow and raises water level up to 30—35 m above mean value. The summer break-up and drifting of ice passes very violently, it leaves traces in the form of torned apart uprooted trees, polished rocks etc.
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Share on Facebook. In , a new expedition, again lead by Kulik, reached its goal. While testimonials may have at first been difficult to obtain, there was plenty of evidence lying around. Eight hundred square miles of remote forest had been ripped asunder. Eighty million trees were on their sides, lying in a radial pattern. Such debranching requires fast moving shock waves that break off a tree's branches before the branches can transfer the impact momentum to the tree's stem.
Thirty seven years after the Tunguska blast, branchless trees would be found at the site of another massive explosion — Hiroshima, Japan. Kulik's expeditions he traveled to Tunguska on three separate occasions did finally get some of the locals to talk. One was the man based at the Vanara trading post who witnessed the heat blast as he was launched from his chair. His account:. Suddenly in the north sky… the sky was split in two, and high above the forest the whole northern part of the sky appeared covered with fire… At that moment there was a bang in the sky and a mighty crash… The crash was followed by a noise like stones falling from the sky, or of guns firing.
The earth trembled. It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33, miles per hour. During its quick plunge, the million-pound space rock heated the air surrounding it to 44, degrees Fahrenheit. At a. Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet.
Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every years. Putting it all in perspective, however, "the thought of another Tunguska does not keep me up at night. Jun 30,
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