| 摘要: |
| 滑坡、泥石流等灾害过程,常在河流岸边形成大型堆积体,缩窄了主河道过流宽度,对主河道水流运动产生影响.通过水槽试验,研究了堆积体作用下陡坡急流河道流速沿程及横向分布规律.试验结果表明:受堆积体影响,水流流态一般可分为上游低速区、主流区、下游回流区及堆积体下游段折冲水流与隐蔽区缓流相遇而形成的斜向水跃.堆积体的壅水作用对主流区流速沿程分布影响较大,随堆积体尺度的增加,对主流流速影响增大,影响范围加大.堆积体上游段,主流流速受堆积体影响减小；急流条件下,堆积体段的过流断面束窄,过流能力降低,主流流速较天然状态有所降低,出现急、缓流过渡,堆积体末端逐步恢复至天然状态.堆积体下游临近断面流速大小与天然状态基本一致,沿横断面的流速比天然状态略有增大,对岸流速则略有降低,随堆积体规模的增加,流速横向变化幅度增大. |
| 关键词: 堆积体 流速沿程分布 流速横向分布 堆积体规模 |
| DOI： |
| 分类号:TV131.61 P642.23 |
| 基金项目:国家自然科学基金项目(50949057) |
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| Streamwise and lateral velocity distribution of steep river underthe action of deposit body |
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GUO Zhi-xue,PENG Qing-e,TANG Lei,LIU Jia-fu,SU Yang-zhong
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GUO Zhi-xue,PENG Qing-e,TANG Lei,LIU Jia-fu,SU Yang-zhong(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University 610065,China)
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| Abstract: |
| The disasters such as landslides and debris flows,often form large deposit in the river bank,which can exert an influence on the river flow through minishing the riverway.Based on the flume experiment,the streamwise and lateral velocity distributions of steep channel under the impact of deposit body are analyzed herein.The results show that: under the impact of deposit,the flow pattern can be divided into four sections,i.e.the low speed zone upstream,the main flow zone,the backflow zone downstream and the R... |
| Key words: deposit streamwise velocity distribution lateral velocity distribution the scale of deposit |
