水科学进展2017，Vol.28Issue(4)：553-563,11.DOI:10.14042/j.cnki.32.1309.2017.04.009
沟岸侧蚀对泥石流形成和运动过程的影响
Role of bank erosion on the gully debris flow initiation and motion
摘要
Abstract
The bank erosion of sediment through the exchange of momentum and energy transfer within the debris flow affects the unstable motion of the debris flow.Many models have been established to study the impact of erosion on debris flow initiation and motion, but most of the models were based on bed erosion.This paper analyzed the process of unstable motion of debris flows through an experimental flume to contrast bank erosion-dominated conditions and bed erosion-only conditions.The experiments showed that bank erosion enhanced the formation and propagation of debris flows.The height and velocity of the debris flows fluctuated along the path under both conditions.However, bank erosion made the motion fluctuation more obvious.Bank erosion usually occurred at the body of the debris flow and the particles moved more rapidly in the body than in the head, resulting in rapid growth of the head by the contribution of particles from the body.The height and additional gradient of the bank erosion-dominated debris flows were higher than those of the bed erosion-only debris flows.So the velocity of debris flow for bank erosion-dominated conditions was higher than that for bed erosion-only conditions.关键词
两相泥石流/间歇运动/侧蚀/颗粒分选/不稳定Key words
two-phase debris flow/intermittent motion/bank erosion/particle sorting/unsteady分类
建筑与水利引用本文复制引用
吕立群,王兆印,崔鹏,徐梦珍..沟岸侧蚀对泥石流形成和运动过程的影响[J].水科学进展,2017,28(4):553-563,11.基金项目
国家自然科学基金资助项目(51479091) （51479091）
中国科学院重点部署项目(KZZD-EW-05-01)The study is financially supported by the National Natural Science Foundation of China (No.51479091). （KZZD-EW-05-01）
