| 雍水分汊河道河型转化特征及其机理 |
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| 引用本文： | 舒安平. 雍水分汊河道河型转化特征及其机理[J]. 水动力学研究与进展(A辑), 1994, 0(1) |
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| 作者姓名： | 舒安平 |
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| 作者单位： | 清华大学水电系 |
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| 摘 要： | 本文考察了长江上游山区河道的河床形态，通过对比分析各级水位下单一河槽与分汊河道的断面河相关系，提出了山区分汉河道平州河相关系的概念。基于这一概念，通过对长江三峡工程变动回水区有关比尺模型试验成果的分析以及进一步的室内概化模型试验，系统地阐述了分汉河道雍水后淤塞一股汊道而向单一河槽转化的主要水流和河床形态特征，并从水面比降与河床形态的相互调整、雍水后水流挟沙力的变化和河道水流能量耗散率等角度对这类河型转化的机理进行了初步探讨，所得出的结论与相应比尺模型试验和野外实测结果相一致。
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| 关 键 词： | 分汊河道，河型转化，雍水淤积 |
The Characteristics and Mechanism of the Transformation for the Braided Channel Pattern in the Backwater State Water Elevation |
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| Shu An- An-Ping. The Characteristics and Mechanism of the Transformation for the Braided Channel Pattern in the Backwater State Water Elevation[J]. Chinese Journal of Hydrodynamics, 1994, 0(1) |
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| Authors: | Shu An- An-Ping |
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| Abstract: | Under the Condition of the backwater,it is Possibie for the braided channel Pattern to transform into single oneby depositing one of the pair channels. Based on the generalized model experiment.and analysis of the Other data,this poperProuts the concept of river factes valation for the moutainous stream and systematically states the features rebated to waterflow and chance aam Phase of the braided channel transformation. It has ben indicated by the investigation that decreaseswith the decrease of water surface slope J and with the increase of the backwater level.The transformation may not carry outuntil foe the braided channel approaches to for single one and water flow tends to stabilize.From the adjustment between and J, the adjustment of sediment transport capacity and theory about flow energy dissipation rate,the paper discusses the mechanism of the transformation.. |
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| Keywords: | braided channel transformation for channel deposition in the backwater reach |
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