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2011年6月6日凌晨,贵州省望谟县在强降雨作用下发生大范围群发性泥石流,泥石流主要分布在降雨集中的望谟县北部山区打尖河、打易河和乐旺河上游。此次群发性泥石流是自1949年有记录以来规模最大的一次,造成了重大的人员伤亡和财产损失。对该次望谟县“6·6”泥石流的灾害特征进行了调查分析。结果表明,望谟县“6·6”泥石流主要是低频率群发性泥石流灾害。由于降雨量大,物源相对较少,泥石流以稀性为主,对沟道产生了较强的冲刷作用。泥石流危害方式主要是冲毁淤埋沟口房屋以及随之产生的灾害链效应。未来在相同降雨条件下还可能暴发较大规模泥石流灾害,建议采取避让和修建防治工程等相应措施进行防治。
In the early morning of June 6, 2011, Wangmo County, Guizhou Province, developed a large-scale mass debris flow under heavy rainfall. Debris flow was mainly distributed in the northern part of Wangmode County, where there was heavy rainfall. The massive mudslides, the largest recorded since 1949, caused heavy casualties and property damage. Disaster characteristics of the debris flow in this Wangmo County “6 · 6” were investigated and analyzed. The results show that the debris flow in Wangmu County is mainly low-frequency massif debris flow disaster. Due to the large amount of rainfall and relatively few provenances, the debris flow is dominated by dilute and has a strong scouring effect on the channel. Debris flow hazards are mainly destroyed silt Mizoguchi housing and the resulting disaster chain effect. In the future, under the same rainfall conditions, it is also possible that a large-scale debris flow disaster will be triggered out and prevention and control measures such as evasion and construction control measures should be taken.