摘要
渭河具有水沙异源的特性,水量主要来自于咸阳以上干流,沙量主要来源于支流泾河。在天然水沙断面资料分析及实体模型试验研究的基础上,根据平滩水位变化情况等,将泾、渭河洪水分为4类组合,分析了典型年份不同水沙组合条件下渭河下游河道的冲淤规律及主槽形态的变化特点。结果表明:1975年以渭河为主的大洪水,对扩大主槽形态、提高主槽输水输沙能力具有明显作用,而1992年以泾河为主的大洪水的作用却不明显;河道萎缩条件下的1995年小水大沙使主槽严重淤积、变得更为宽浅,断面面积减小。
The Weihe River has the characteristics of different source of water and sediment.The water mainly comes from the stem stream above Xianyang and sediment mainly from Jinghe River,a tributary of the Weihe River.It divides the floods of Jinghe and Weihe rivers into 4 categories based on data analysis of natural sediment and discharge cross-section and physical modeling.According to variations of bankfull stage,it analyzes the law of scour and fill of the lower Weihe River channel and characteristics of morphological variation of the main channel under the conditions of different sediment-discharge combination in typical years.The outcomes show that a) major flood of taking Weihe River water as the main in 1975 has remarkable functions on increasing main channel morphology and the capability of water delivery and sediment transport,while the function of major flood of taking Jinghe River water as the main in 1992 is not remarkable;b) deficient in water and abundant in sediment happened in 1995 causes serious deposition and makes the main channel much wider and shallower and reduction of cross-section area under the conditions of shrunk channel.
出处
《人民黄河》
CAS
北大核心
2010年第4期38-40,45,共4页
Yellow River
基金
水利部江湖治理与防洪重点实验室开放研究基金资助项目(R2007-14)
水利部"948"科技创新与推广项目(CT200330)
关键词
水沙组合
冲淤规律
断面形态
平滩水位
渭河下游
sediment-discharge combination
law of scour and fill
section morphology
bankfull water level
the lower Weihe River
