Named cause high velocity gases and volcanic ash
Typically, volcanic eruptions accompanied by so-called pyroclastic flow - hot cloud of volcanic gas, and ash hardwood. These particles travel at speeds of several hundred kilometers per hour, and if they did not lend themselves to the laws of physics - solid fragments should obviously cause friction and slow down. It is believed that these flows have caused loss of life in Pompeii during the eruption of Vesuvius, and scientists still have no idea how to avoid such disasters in the future. However, they were able to determine the cause of a high speed hot clouds, and this discovery could save thousands of lives.
Unfortunately, the study of movement of hot particles by simple observation is not possible, because the cloud temperature may reach 1000 degrees Celsius. Researchers from the University of Massey, New Zealand decided to follow it in a laboratory experiment. They took the particles of volcanic eruption Taupo, warmed them up to 130 degrees Celsius and in large volumes allowed for the 13-meter chute. Moving filmed with a deceleration function.
Based on their observations, researchers found that large particles are moving at high speed due to the formation of the air layer underneath, excluding friction. This layer occurs when the rate of two to six meters per second - it depends on the height of the flow. The lifted from the base as air penetrates into the flow, further pushing the heavier particles. We can say that they virtually fly through the air, destroying everything in its path.
The researchers believe that the new discovery will allow them to more accurately assess the risk of future disasters and to come up with ways to protect people. It is noteworthy that the discovery not only explains the high rate of volcanic particles, but landslides and avalanches.
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