渭河下游洪水冲淤特性及不淤临界流量分析  

Analysis on Characteristics of Scour and Fill of Floods and Critical Discharge of No Sedimentation at the Lower Weihe River

作　　者：张翠萍[1] 张超[1] 伊晓燕[1] 罗立群[1] 

机构地区：[1]黄河水利科学研究院,河南郑州450003

出　　处：《人民黄河》2011年第2期27-28,31,共3页Yellow River

基　　金：黄河水利科学研究院基本科研业务费资助项目(HKY-JBYW-2008-9)

摘　　要：分析了渭河下游1974—2005年不同流量级和含沙量级的200多场洪水排沙比与洪峰流量的关系,结果表明：①渭河洪水可分为平均含沙量小于100 kg/m^3的较低含沙量洪水、100-200 kg/m3的中等含沙量洪水和200 kg/m3以上的高含沙洪水;②渭河下游泥沙冲淤主要发生在洪水期,洪水期大流量洪水一般会发生冲刷,小流量洪水一般会发生淤积;③渭河下游洪水不淤临界流量约为2 000 m^3/s左右,洪水平均含沙量在100 kg/m^3以下和200 kg/m^3以上时,洪水不淤临界流量分别为1 000、1 700 m^3/s。The paper analyzes the relationships of sediment delivery ratio and peak discharge of more than 200 events of floods with different discharge and sediment concentration of the lower Weihe River during 1974-2005 period.The outcomes show that a) the floods of the river can be divided into lower sediment concentration flood of less than 100 kg/m3,medium sediment concentration flood of 100-200 kg/m3 and high sediment concentration flood of greater than 200 kg/m3;b) the scour and fill of the lower Weihe River mainly occur in flood season,usually it scours in big discharge of flood and deposits in small discharge of flood in flood season and;c) the critical discharge of no sedimentation at the lower river is about 2 000 m3/s.When the average sediment concentration of flood is less than 100 kg/m3 and greater than 200 kg/m3,the critical flood discharge of no sedimentation is 1 000 m3/s and 1 700 m3/s respectively.

关 键 词：不淤临界流量 冲淤特性 洪水 渭河下游 

分 类 号：P333[天文地球—水文科学]