沟岸侧蚀对泥石流形成和运动过程的影响

沟岸被侧蚀掉的松散物质会通过动量交换将能量传递给龙头,从而影响泥石流的形成和运动过程。前人建立了许多模型来研究泥石流的侵蚀过程对泥石流形成和运动过程的影响,但是模型中大多以底蚀作用为前提条件。通过侧蚀模型和底蚀模型两种水槽实验的对比,针对泥石流的形成和运动过程展开研究。实验发现侧蚀作用更有利于泥石流的形成和运动,泥石流的龙头高度和速度都有波动特征,但侧蚀作用使得这种波动特征更加明显。侧蚀作用使得泥石流的龙身速度更快于龙头速度,龙身颗粒源源不断地堆积于龙头,使得龙头有较大的高度和附加坡降,因此,侧蚀条件下龙头的速度更快。...

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Bibliographic Details
Published in水科学进展 Vol. 28; no. 4; pp. 553 - 563
Main Author 吕立群 王兆印 崔鹏 徐梦珍
Format Journal Article
LanguageChinese
Published 清华大学水沙科学与水利水电工程国家重点实验室,北京,100084%中国科学院山地灾害与地表过程重点实验室,四川成都,610041 2017
Subjects
不稳定
两相泥石流
侧蚀
间歇运动
颗粒分选
不稳定
侧蚀
particle sorting
bank erosion
间歇运动
颗粒分选
intermittent motion
unsteady
two-phase debris flow
两相泥石流
Online AccessGet full text
ISSN1001-6791
DOI10.14042/j.cnki.32.1309.2017.04.009

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Summary:沟岸被侧蚀掉的松散物质会通过动量交换将能量传递给龙头,从而影响泥石流的形成和运动过程。前人建立了许多模型来研究泥石流的侵蚀过程对泥石流形成和运动过程的影响,但是模型中大多以底蚀作用为前提条件。通过侧蚀模型和底蚀模型两种水槽实验的对比,针对泥石流的形成和运动过程展开研究。实验发现侧蚀作用更有利于泥石流的形成和运动,泥石流的龙头高度和速度都有波动特征,但侧蚀作用使得这种波动特征更加明显。侧蚀作用使得泥石流的龙身速度更快于龙头速度,龙身颗粒源源不断地堆积于龙头,使得龙头有较大的高度和附加坡降,因此,侧蚀条件下龙头的速度更快。
Bibliography:LYU Liqun1, WANG Zhaoyin1, CUI Peng2, XU Mengzhen1 （ 1. State Key Laboratory of Hydroseience and Engineering, Tsinghua University, Beijing 100084, China ; 2.Mountain Hazard and the Earth＇s Surface Processes Key Laboratory, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041. China ）
32-1309/P
two-phase debris flow; intermittent motion; bank erosion; particle sorting; unsteady
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
ISSN:1001-6791
DOI:10.14042/j.cnki.32.1309.2017.04.009