Debris flow

Debris flow is to point to in the mountains or other He deep valleys, steep terrain area, becausestormBlizzard or otherNatural disastersCaused by thelandslidesAnd with a large number of sediment and rocks of the special stream.Debris flow is sudden and rapid flow, flow rate, material capacity and strong destructive power etc.Debris flow occur often destroyed by railway and other transportation facilities and even villages and towns, resulting in great loss.

Debris flow^[1]isstorm、The floodWill contain sand and soft soil by diluted by the saturation flow form, its area, volume and flow are bigger, and the dilution soil landslide is a small area of the mountain area, the typical debris flow by suspended the bulky solid debris and rich in silt and clay sticky mud composition.In the appropriate terrain conditions, a lot of water soaking water bed slope or ditch the solid material accumulation, make its stability is reduced, full of water accumulation of solid material in itselfgravityHappened under the action of sports, they form a debris flow.Debris flow is a kind of disasterGeological phenomenon.Debris flow broke out suddenly, feral, can carry great stones.Because of its high speed, with a strong energy, thus can be very destructive.
The whole process of debris flow generally only a few hours, short only a few minutes.Debris flow is a widely distributed all over the world some with special topography, physiognomy status areas of natural disasters, mountain valleys or mountain slope surface, by the heavy rain, ice and snow melting water and stimulate, contains a lot of sediment rocks between carrying water flow and landslide between the soil, water, gas mixed flow.With most of the debris flowmountainThe floodAnd happen.It and general flood is the difference between stream contains a sufficient number of sediment stone, solid debris, the volume content at least 15%, the most High can reach 80%, so more destructive than the flood.Debris flow is the main harm washed out town, enterprises, institutions, factories, mines, rural, causing damage human casualties, houses and other engineering facilities, destroyed crops, trees and cultivated land.In addition, the debris flow sometimes silting up channel, not only block the shipping, may causeflood.Debris flow influence the intensity of many factors, such as debris flow capacity, velocity and flow rate and so on, the debris flow discharge of debris flow hazard degree of impact on the most main.In addition, a variety of human activities in many aspects and intensifying the above factors effect, promote the formation of debris flow.^[3]Rock often happened in canyon area and earthquake volcanic prewarning, in heavy rains period has the outbreak of.It is a stream of mudstone flow, instantly broke out, is a mountain area is the most serious natural disasters.

Multiple zone

Pacific rim fold belt (mountain), alpine - Himalayan fold belt, Eurasia internal some fold mountain.There are nearly fifty countries exist debris flow potential threats.The more serious of Colombia, Peru, Switzerland, China, Japan.China, there are more than 10000 of the debris flow gully, most of the distribution in Tibet, sichuan, yunnan, gansu.Sichuan, yunnan is the rain debris flow, the debris flow is more high principles ice and snow.China has more than 70 county seat by debris flow potential threats.Japan, it has more than 62000 debris flow gully, in the spring, the rainy season often broke out.