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	潼关高程下降对渭河下游防洪的影响
	李昌志 ; 王兆印 ; 吴保生 ; 王费新 ; LI Chang-zhi ; WANG Zhao-yin ; WU Bao-sheng ; WANG Fei-xin
	2010-06-10 ; 2010-06-10
关键词	潼关高程 渭河下游 防洪形势 Tongguan's elevation descending lower reaches of Weihe River flood defense TV147
其他题名	Effect of descending Tongguan's elevation on flood defense situation of Weihe River
中文摘要	潼关高程抬升引起渭河下游大量泥沙淤积,给防洪带来一系列问题。本文针对这一问题,通过对渭河下游河道40多年的大断面地形资料进行分析和计算,探讨了潼关高程与渭河下游泥沙冲淤的关系,并分析了典型断面的水位变化。结果表明,潼关高程与渭河下游泥沙冲淤密切相关,潼关高程下降后,渭河会产生溯源冲刷。在大水少沙情况下,近槽滩地也会受到冲刷,但是洪水漫滩后滩地会发生淤积,由于主槽面积增加,过洪能力增强,中小洪水防洪压力减小;但如果发生高含沙漫滩洪水,滩地淤积,漫滩洪水水位反而有所抬高,大洪水威胁依然存在。; The relationship between Tongguan's elevation and the erosion of lower reaches of Weihe River was analyzed according to the data of field measured river cross sections in 40 years.The result indicates that the erosion is closely related with the change of Tongguan's elevation.Retrogressive erosion in the lower reaches of Weihe River developed when Tongguan's elevation descended.Erosion of floodplain occurred in the vicinity of the main channel but sedimentation occurred on the floodplain where far from the main channel,in case of over-bank flood.It may infer that if Tongguan's elevation is descended by 2m,the gradient of lower reaches of Weihe River will increase because of retrogressive erosion.The cross section of main channel will be enlarged.Hence the flood discharge capacity of the main channel will increase and the flood risk of small-scale or mid-scale flood will be reduced.However,the flood stage will be raised during over-bank flood because of the sedimentation on floodplain resulting in increase of flood threat.; 国家自然科学基金群体创新项目(50221903 3); 国家自然科学基金项目(50279024;50409003)
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/59887]
专题	清华大学
推荐引用方式 GB/T 7714	李昌志,王兆印,吴保生,等. 潼关高程下降对渭河下游防洪的影响[J],2010, 2010.
APA	李昌志.,王兆印.,吴保生.,王费新.,LI Chang-zhi.,...&WANG Fei-xin.(2010).潼关高程下降对渭河下游防洪的影响..
MLA	李昌志,et al."潼关高程下降对渭河下游防洪的影响".(2010).

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