水利学报2023，Vol.54Issue(12)：1496-1506,11.DOI:10.13243/j.cnki.slxb.20230047
河流动床阻力影响参数分析及其计算研究
Parameter analysis and calculation method of moving bed resistance
摘要
Abstract
The calculation method of movable bed resistance is very important to the study of river dynamics and the solution of engineering problems.Since the middle of the 20th century,methods for calculating the resistance have appeared one after another.In this paper,the existing research results are described,and the classical Ein-stein and Qian Ning(N.Chien)resistance calculation methods are analyzed in detail.It is found that the calculation method of movable bed resistance based on hydraulic radius split hypothesis is not suitable for the bed form which is mainly determined by suspended load sediment transport intensity.Therefore,this paper firstly selects representative physical quantities and carries out correlation analysis with measured roughness values to determine the main parameters.The indexes of water depth and energy slope are determined by data analysis.The energy slope is mainly composed of riverbed gradient and local head loss,the gradient of riverbed is calculated by using the for-mula of median size of bed load under dominant discharge.The introduction of vortices parameter can reflect the in-fluence of sediment content on movable bed resistance.In conclusion,a new method for calculating the resistance of movable bed is established.Verification results of a large number of measured data show that the formula in this paper has high calculation accuracy and strong applicability.关键词
动床阻力/糙率/冲积河流/黄河/能坡Key words
movable bed resistance/roughness/alluvial river/Yellow River/energy slope分类
建筑与水利引用本文复制引用
李琳琪,张红武,侯琳,李浩博..河流动床阻力影响参数分析及其计算研究[J].水利学报,2023,54(12):1496-1506,11.基金项目
国家重点研发计划项目(2016YFC0402500) （2016YFC0402500）
鄂尔多斯水利科技重点项目(20232000090) （20232000090）
