| 不同含沙量水流对河床形态调整影响的实验研究 |
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| 引用本文： | 张欧阳,马怀宝,张红武,董占地,徐向舟.不同含沙量水流对河床形态调整影响的实验研究[J].水科学进展,2005,16(1):1-6. |
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| 作者姓名： | 张欧阳 马怀宝 张红武 董占地 徐向舟 |
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| 作者单位： | 1.长江水利委员会水文局, 湖北, 武汉, 430010; |
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| 基金项目： | 国家重点基础研究发展计划(973)资助项目(2003CB415205)，国家自然科学青年基金资助项目(40201008)~~ |
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| 摘 要： | 水沙条件变化后河床形态的调整是河流地貌学中一个极为重要的问题.但国内外学者基于不同的含沙量变化范围得出的结论刚好相反.采用过程响应模型实验方法,研究和验证了河床形态调整对于不同含沙量水流过程的复杂响应现象,从实验的角度部分地修正了Schumm关于水沙条件变化后河床形态调整方向的定性预测关系.
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| 关 键 词： | 河床形态调整 不同含沙量水流 模型实验 |
| 文章编号： | 1001-6791(2005)01-0001-06 |
| 收稿时间： | 2003-12-26 |
| 修稿时间： | 2003年12月26 |
Experimental study on influences of sediment-laden flow with wide sediment concentration range on channel metamorphosis |
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| ZHANG Ou-yang.Experimental study on influences of sediment-laden flow with wide sediment concentration range on channel metamorphosis[J].Advances in Water Science,2005,16(1):1-6. |
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| Authors: | ZHANG Ou-yang |
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| Institution: | 1.Bureau of Hydrology, Yangtze River Water Resources Commission, Wuhan 430010, China;2.Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;3.Institute of Hydraulic Research of Yellow River Conservation Commission, Zhengzhou 450003, China |
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| Abstract: | River metamorphosis caused by river regime is one of the most important issues in fluvial geomorphology.In this issue,Schumm has proposed a famous qualitative relation.But the relation is quite different in China when it is applied to hyper-concentrated flows.To resolve this controversy,a process-response model experiment using secondary deposited loess with the median diameter of about 0.042mm as well as with a wide sediment concentration range conducted in an 11m×3m flume.The experimental results show that sediment-laden flows with the different sediment concentrations have different behaviors in fill-scour and the ways of channel adjustment.Because of the existence of the hyper-concentrated flow,the sediment-laden flow needs less energy dissipation to transport sediment.Therefore,the variations of the channel form exhibit complex relations with those of the sediment concentration.When the sediment concentration is low,the ratio of the width to the depth of the channel will increase and when it increases to a certain degree to the field of hyper-concentrated flow,the width-to-depth ratio will decrease with the increase of sediment concentration.So does the sinuosity.Thus,according to the experimental results and some case studies about the range of non-hyper-concentrated flow in China,Schumm's relation is correct and available,but to hyper-concentrated flow,Schumm's relation should be modified. |
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| Keywords: | channel adjustment wide sediment concentration range experimental study |
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