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通过对岷江大咕噜沟 1999 0 6 16泥石流的数次现场考察与观测 ,首先叙述了本次泥石流的活动及其危害情况 ,描述了泥石流的形成条件 ,指出了泥石流发生的原因 ,认为本次泥石流是由于大咕噜沟流域内物质的含水量较高 ,在连续暴雨的条件下其含水量将会超饱和 ,引起二岔沟以上南支右岸海拔 3750m处的沟岸滑 ,进而产生泥石流的。然后对流沟沟床演变以及单侧支流入汇的影响进行了分析 ,认为大咕噜沟主沟呈串珠状沟道 ,平面上宽窄相间 ,纵剖面为深潭—跌水形式 ,跌坎的形成通常有以下三种情况 :一种是沟床本身为岩石或含有岩石 ,一种是两岸崩塌或滑坡而残留的粗大堆积物形成 ,一种是支流的冲出物或堆积扇形成。另外 ,同岸支沟的存在使主河逼近对岸 ,在岩坡稳定性较差的条件下 ,使对岸产生相当规模的崩塌或滑坡。最后 ,提出防治泥石流灾害的建议。
Based on several on-site investigations and observations on the debris flow in Dayugurongou of Minjiang River, the debris flow activity and its damage were described. The formation conditions of the debris flow were described. The reasons for the occurrence of the debris flow were pointed out. Due to the high water content of DaguGuruGrow watershed, its water content will be supersaturated under continuous rainstorm conditions, causing the ditch slippery above 3750m on the right bank of the south branch of Dachaicha to flow into debris flow. Then it analyzes the evolution of ditch ditch bed and the influence of unilateral tributary into the sink. It is believed that the main gully ditch of Beilulugou is beaded channel, the width and width are on the plane, the deep trough - There are three cases: one is that the furrow itself is a rock or a rock, one is a coarse deposit left by the collapse or landslide of both sides of the channel, and one is tributary effluvium or accumulation fan formation. In addition, the existence of the tributary of the same channel approached the main river to the opposite shore, resulting in a considerable scale of collapse or landslide on the other side under the condition of poor stability of the rock slope. Finally, put forward the proposal of preventing and controlling debris flow disasters.