| 阶梯-深潭的形成及作用机理 |
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| 引用本文： | 徐江,王兆印.阶梯-深潭的形成及作用机理[J].水利学报,2004,35(10):0048-0055. |
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| 作者姓名： | 徐江 王兆印 |
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| 作者单位： | 1. 清华大学,水利水电工程系,北京,100084
2. 清华大学,水利水电工程系,北京,100084;国际泥沙研究培训中心,北京,100044 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)(2003CB415206) |
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| 摘 要： | 阶梯-深潭系统是山区河流中常见的河床微地貌现象。本文通过水槽实验，研究了在不同的水流流量、河床坡度、床沙级配和上游来沙率条件下，阶梯-深潭的形成过程。在此基础上探讨了阶梯-深潭的发育和作用机理。通过定义阶梯-深潭发育程度系数SP，结合水槽实验结果和天然阶梯-深潭河流的资料，总结阶梯-深潭的发育条件，得出了SP与河道坡度、床沙级配、上游来沙率之间的关系式，并分析了阶梯-深潭系统增加水流阻力，消减水流动能，稳定河床的作用。
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| 关 键 词： | 阶梯-深潭系统 阶梯-深潭发育程度 水流阻力 消能 河床稳定性 |
| 文章编号： | 0559-9350(2004)10-0048-08 |
| 收稿时间： | 2003/7/28 0:00:00 |
| 修稿时间： | 2003年7月28日 |
Formation and mechanism of step-pool system |
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| XU Jiang.Formation and mechanism of step-pool system[J].Journal of Hydraulic Engineering,2004,35(10):0048-0055. |
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| Authors: | XU Jiang |
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| Affiliation: | Tsinghua University, Beijing 100084, China |
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| Abstract: | The step-pool sequence is a kind of micro-morphology widely existing in mountain stream. The formation process of this kind of system under the conditions of different discharges, stream bed slopes, gradations of sedimentation and incoming sediment rates from upstream are studied experimentally in laboratory. On this basis, the evolution and mechanism of this system are further investigated. An index namely SP coefficient is proposed to evaluate the development degree of the system. The expression of SP related to riverbed slope, gradation of sediment and incoming sediment rate from upstream is established according to the experimental data. The effects of step-pool system on enhancing the flow resistance, dissipating the kinetic energy of stream flow and stabilization of riverbed are analyzed. |
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| Keywords: | step-pool sequence micro-morphology development degree flow resistance energy dissipation stability of riverbed |
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