2012年“7•14”唐家沟泥石流灾害特征

July 14，2012 in Tangjiagou ravine of Shimian County，Sichuan Province the event of debris flow disasters，resulting in two deaths and five missing and huge property and economic losses.Debris flow with the following characteristics：caused by the ravine upstream local torrential rain，formation mechanism for the type of start of the ditch bed，debris flow process lasted approximately 1 hour，a total of approximately 850 000 m3，especially for low-frequency large-scale debris flow；the ravine relative height of3 139 m，steep-channel and multi-bend，bayonet，leading to fluid in movement repeatedly block - outburst the clogging coefficient of 2.5 to 3，increased discharge and destruction；in the middle and lower reaches of the ravine，debris flow ditch bed sediments supply，extend the range of the recharge area of mud，sand and stones；debris flow density，severe up to 20.6 kN/m3，handling of strong，handling the largest volume of stones about235 m3，weight about 645 t；the fluid straight-forward，bend ultra-high height greater than 10 m；debris flowblocking the main river and the formation of the outburst disaster，and flash floods constitute a chain of mountain disasters，the harm extends to the main river both sides of the wide range of. Forest vegetation in the ravine is dense，but failed to stop living the occurrence of debris flow.Local residents in disaster prevention awareness is not strong，more debris flow hazard buildings，debris flow hazards object more increased disaster losses；particularity of the debris flow movement（bend ultra-high） increase the scope of the hazards；And casualties. Good ecological environment in the mountains，still need to guard against debris flow hazards.