四川雷波碉楼沟泥石流特征及防治对策

碉楼沟泥石流沟为西苏角河左岸的一级支流,位于四川省雷波县西侧,流域面积0.85km~2,主沟长度1.6km,纵比降504.4‰。碉楼沟流域属构造侵蚀高中山地貌,呈叶状,支沟众多,主沟较少暴发泥石流。2015年5月7日碉楼沟暴发山洪灾害,造成8人死亡和严重财产损失,并对下游马颈子场镇居民的生命财产安全构成了威胁。在地质勘查的基础上,分析泥石流基本特征、形成条件,计算泥石流的重度、流速、一次泥石流总量等动力学参数。结合碉楼沟泥石流的特征和场镇社会、经济可持续发展的需要,提出防治方案,对该类泥石流沟谷的调查和防治具有一定实际意义。

FEATURES AND PREVENTIVE COUNTERMEASURES OF POTENTIAL DEBRIS FLOW IN DIAOLOU GULLY,LEIBO COUNTY,SICHUAN PROVINCE

The Diaolou gully is a left-bank branch of the Xisujiao River,located in the west side of Leibo County,Sichuan Province.The gully has a basin area of 0.85 km2, 1.6 km long,and the gully's longitudinal slope is 504.4‰.Diaolou gully,shaped like a leaf with many branch gullies,belongs to the alpine and middle structural erosion gorge geomorphy,the main gully hardly outbreak debris flow.A catastrophic mountain torrent occurred in the gully on may,2015,which killed eight residents,caused serious property damage and still threaten resident safety of the Majingzi country.Based on the geological investigations, features and formation conditions are analyzed for the potential debris flow, Then the dynamic parameters such as bulk density,velocity and transport material volume in total are computed.Based on debris flow hazard features and sustainable development of local social and economic situation,preventive countermeasures for the potential debris flow hazards are presented,which have importance for investgation and prevention of potential debris flow.