Xiaojin Meiwo Couty Gaodiao Gully Debris Flow Study On Developmental Characteristics And Control Measures

Gao diao ditch is an old debris flow, in July 2011 the outbreak of a large-scale debris flow, its frequency is equivalent to 50 years according to the mud and debris flow,accumulation area calculation of the debris flow for a total of 37600m3, a solid debris out for 20200m3, mainly for on both sides of the ditch body landslide and finally ditch source involved in the movement of debris flow, resulting in accumulation fan residents. In recent years, especially the "5.12" Sichuan earthquake, bad geological phenomenon trench collapse and landslide is greatly increased, soil erosion intensified, source of loose solids quantity of debris flow activity may be involved in the growth of the critical rainfall intensity of debris flow excited High Ditch towers decreased, debris flow frequency may increase the potential threat to Mizoguchi accumulation fan 102 people's life and property safety. In this paper,through a detailed investigation of the debris flow, we have mastered the formation conditions and the basic characteristics of the debris flow, the total reserves of various source channel domain is about 93400m3, the dynamic reserve of inference can participate in debris flow is about 32700m3, provides sufficient source conditions for the debris flow gully high towers; the debris flow Valley morphology is like a spindle, basin longitudinal length of about 6.07km, the average width of 1.78km, watershed area of 11.07km2, the main channel flow is tortuous, gradient 205?347 per thousand, the average longitudinal gradient of 282 per thousand, with the mountain gully feature from Southwest to the north east slope is steep, gully horizontal overall is "V" the upper valley shape, narrow, steep slope of gully bed, provide favorable terrain conditions for the formation of debris flow. The possibility of debris flow again in large rainfall conditions greatly, which has put forward the debris flow"in the solid source and blocking and drainage combined with" comprehensive management measures. The circulation area of narrow valley, valley with a large storage capacity Neikuan corrosion zone construction 3 dam was formed in the debris flow, the debris flow blocking of alluvial material, can effectively retain the solid material of debris flow in the dam in 90%; centralized accumulation and channel loose deposits set 6 submerged dam of solid source in the ditch on both sides, can be 15800m3 fluid solid source; build the drainage tank discharge near flood change shape after the use of existing channels, in order to protect the circulation accumulation area residents personal and property safety,achieve the purpose of disaster prevention and mitigation.