| 沟岸侧蚀对泥石流形成和运动过程的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 吕立群 王兆印 崔鹏 徐梦珍 |
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| 作者单位： | 1.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; |
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| 基金项目： | 国家自然科学基金资助项目（51479091）；中国科学院重点部署项目（KZZD-EW-05-01） |
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| 摘 要： | 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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| 关 键 词： | 两相泥石流 间歇运动 侧蚀 颗粒分选 不稳定 |
| 收稿时间： | 2016-07-01 |
Role of bank erosion on the gully debris flow initiation and motion |
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| LYU Liqun,WANG Zhaoyin,CUI Peng,XU Mengzhen.Role of bank erosion on the gully debris flow initiation and motion[J].Advances in Water Science,2017,28(4):553-563. |
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| Authors: | LYU Liqun WANG Zhaoyin CUI Peng XU Mengzhen |
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| Affiliation: | 1.State Key Laboratory of Hydroscience 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 |
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| 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. |
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| Keywords: | two-phase debris flow intermittent motion bank erosion particle sorting unsteady |
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