水利学报2024，Vol.55Issue(9)：1020-1032,13.DOI:10.13243/j.cnki.slxb.20230752
黄河水流阻力及河床比降计算方法研究
Study on calculation of flow resistance and riverbed slope of the Yellow River
摘要
Abstract
The study of flow bed resistance in alluvial river has a significant impact on flood evolution and riverbed deformation.Therefore,this article first analyzes the correlation between multiple single hydraulic factors,dimen-sionless hydraulic parameters and roughness coefficients using the field test data from the lower reaches of the Yellow River.It concludes that the primary hydraulic factors influencing roughness are water depth,slope,sedi-ment concentration,and longitudinal stability coefficient of the river channel.Subsequently,based on the general expression of Zhang's flow velocity and principles of river dynamics,the study determines indices for water depth and slope,which reflect the effects of physical characteristics such as velocity gradients,riverbed stability,and sediment transport intensity on hydraulic resistance.Then,a formula for calculating riverbed slope and hydraulic energy slope is proposed,which avoids using surface slope values with significant observation errors to directly sub-stitute the hydraulic gradient,thereby enhancing the accuracy of roughness calculations.Finally,a formula suitable for the Yellow River was established,which can be used to calculate the flow resistance with only a few measured parameters.Verified by 3188 sets of measured data from the main and tributaries of the Yellow River,the roughness calculated using this method is quite similar to the measured values,with a correlation coefficient of 0.894 and a relative error of only 16.5％.The method in this paper can provide theoretical support for the calcula-tion of water flow resistance in the Yellow River.关键词
水流阻力/河床比降/黄河/糙率/河床纵向稳定系数Key words
flow resistance/riverbed slope/the Yellow River/roughness/longitudinal stability coefficient of river-bed分类
建筑与水利引用本文复制引用
侯琳,张红武,李琳琪,李希稷..黄河水流阻力及河床比降计算方法研究[J].水利学报,2024,55(9):1020-1032,13.基金项目
国家重点研发计划项目(2016YFC0402500) （2016YFC0402500）
国家自然科学基金青年科学基金项目(52009145) （52009145）
鄂尔多斯水利科技重点项目(20232000090) （20232000090）
