中文摘要：

Zelongnong 沟壑， Brahmaputra 的一条分支沟壑，是一条旧大冰河碎片流动沟壑。有中等或小的规模的碎片流动发生几乎每年；多重超级碎片流动也历史上爆发了，并且在沟壑的嘴引起了破坏灾难到本地居民并且堵住了 Brahmaputra。巨大的高度差别和 Zelongnong 沟壑的陡峭的斜坡为碎片流动提供占优势的精力条件。在复杂地质的结构，击碎的岩石，和经常的地震使岩石经验强壮的地方，排水盆位于快高举的区域捱过的、这样很多的小粒的材料为碎片流动的形成是可得到的。尽管这个区域位于雨阴影区域，降水被集中并且最与高紧张。另外，强壮的冰河活动为碎片流动提供水来源。根据文学评论，在沟壑的大多数碎片流动被暴风雨导致，并且他们的规模是相对小的。然而，当融化的水被覆盖时，大规模碎片流动可以发生。象流动速度和流量那样的参量的计算根据监视数据被进行。当暴风雨和融化的水被联合很好时，结果证明大碎片流动能被引起，但是堵住离开 Brahmaputra 的可能性是稀罕的。超级碎片流动的出现是仔细与强烈冰河活动有关(例如，冰河巨浪) 。他们经常导致破坏灾难并且是难的被设计措施阻止并且治好，由于 oversized 规模。象监视和预言那样的危险缓解措施被建议。

英文摘要：

Zelongnong Ravine,a branch ravine of Brahmaputra,is an old large glacier debris-flow ravine.Debris-flows with medium and/or small scales occur almost every year;multiple super debris-flows have also broken out in history,and have caused destructive disaster to local residents at the mouth of ravine and blocked Brahmaputra.The huge altitude difference and the steep slope of the Zelongnong Ravine provide predominant energy conditions for the debris-flow.The drainage basin is located in the fast uplifted area,where the complicated geologic structure,the cracked rock,and the frequent earthquake make the rocks experience strong weathering,thus plenty of granular materials are available for the formation of debris-flows.Although this region is located in the rain shadow area,the precipitation is concentrated and most is with high intensity.Also,the strong glacier activity provides water source for debris-flow.According to literature reviews,most debris-flows in the ravine are induced by rainstorms,and their scales are relatively small.However,when the melted water is overlaid,the large scale debris-flows may occur.Parametric calculation such as the flow velocity and the runoff is conducted according to the monitoring data.The result shows that large debris-flows can be aroused when the rainstorm and the melted water are combined well,but the possibility of blocking off Brahmaputra is rare.The occurrence of the super debris-flows is closely related to the intense glacier activity（e.g.,glaciersurge）.They often result in destructive disasters and are hard to be prevented and cured by engineering measures,due to the oversized scales.The hazard mitigation measures such as monitoring and prediction are proposed.