| 刘怀湘,王兆印.山区河流床面结构发育野外现场试验研究[J].水利学报,2009,40(11): |
| 山区河流床面结构发育野外现场试验研究 |
| Field experimental study on development of mountain streambed structures |
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| DOI： |
| 中文关键词: 山区河流 床面结构 坡降 野外现场试验 |
| 英文关键词: mountain river streambed structures slope field experiment |
| 基金项目: |
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| 摘要点击次数: 2655 |
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| 中文摘要: |
| 山区河流在长期的河床演变中常发育一定的床面结构，起到增加河道稳定性等作用，从而对未来演变过程产生影响。为研究床面结构的发育分布及其与环境条件之间的关系，本文在蒋家沟泥石流堆积体上设计了野外现场试验，分析不同工况下床面结构的形成、河床演变机理及人工建设床面结构所带来的后果。结果表明，达到动力平衡时，河道中发育的床面结构越强，消耗水流能量越多，从而稳定维持的纵坡降越大，因此在一定程度上决定了河道纵剖面。自然发育的床面结构受到运行工况的控制，即不同工况决定了不同的床面结构分布。此外人工结构能起到和天然结构相同的作用，即消耗能量、延缓下切，改变演变方向等，因此能够用于山区河流治理。 |
| 英文摘要: |
| Streambed structures were developed in many mountain rivers as a result of fluvial morphology. They affected the further morphology process in some aspects such as channel stability enhancement. A filed experiment was conducted on debris flow deposits in Jiangjiagou ravine to study the distribution of streabed structures and their relationship with environment conditions. The structures development, morphology mechanism and artificial structure engineering under different operation conditions were investigated during the experiment. The results indicated that more intense streambed structure means greater stream power consumption and steeper channel slope when rivers are in dynamic equilibrium. Therefore the channel longitudinal profiles could be determined by the distribution of steambed stuctures, which were controled by operation conditions. The artificial structures could also consume energy, impede channel incision, affect fluvial morphology process and so on. Thus this method could be applied in management of mountainous rivers. |
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