河床冲刷粗化特征与粗化程度  

Coarse Features and Degree of River Bed

作　　者：李文萍[1] 曹叔尤[2] 刘兴年[2] 

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《四川大学学报（工程科学版）》2009年第5期24-29,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家重点基础研究发展规划“973”项目(2003CB415202);国家自然科学基金项目(50579041)

摘　　要：根据前人对暴露度和等效粒径研究的成果,选择适合于长江上游典型河段起动及输沙率公式,对各典型河段床沙粗化程度的参数A值进一步确定,通过分析可知,粗化程度A值在时间和空间上都存在变化规律,汛期粗化程度比枯水期小,并且各河段粗化程度上游比下游粗化程度大。粗化程度A值不随粒径的变化而变化,河床糙率n随A值呈线性变化趋势,根据有限的资料进行了拟合,得到一个A值与n值的关系式。According to the studies on exposure degree and equivalent size of our predecessors,start-up and sediment transport rate formula of the right in the upper reaches of the Yangtze River typical was chosen and parameter A of coarse degree on the typical section of the river bed was defined.Through analysis it was found that the coarse degree in time and space changes in laws.Coarse degree was lighter in flood season than in dry season,and it was lighter upstream than downstream.It was not changed with the grai...

关 键 词：冲刷 粗化 粗化特征参数 粗化程度 

分 类 号：TV147[水利工程—水力学及河流动力学]