摘要
针对不同形态的单一河道断面,计算分析了各种情况下用断面平均水深代替水力半径的相对误差,及其在流量计算和水面线计算中的衍生误差.研究发现,采用断面平均水深代替水力半径进行水力计算,不同的断面形态在不同的宽深比下其相对误差和衍生误差区别很大.因此,在水动力学计算中,水力半径不可以用其他变量来近似.
Hydraulic radius is an important variable in hydrodynamic calculation,it is usually replaced by the cross-sectional average water depth in actual calculation.Based on various unitary morphology river cross-sections,this paper calculates and analyzes the relative errors of the cross-sectional average water depth instead of hydraulic radius under different circumstances,and their derived errors in calculation of discharge and water surface curve.It has been shown that relative errors and their derived errors are very different in various cross-sections which have different width to depth ratios when using the cross-sectional average water depth as a substitute for hydraulic radius.Therefore,it is advised that the hydraulic radius could not be replaced by other variables in hydrodynamic calculation.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2010年第2期143-147,共5页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:10772137)
关键词
水力半径
断面平均水深
宽深比
相对误差
衍生误差
hydraulic radius
cross-sectional average water depth
width to depth ratio
relative error
derived error
