无黏性非均匀沙的参数自适配起动切应力计算方法  

A parameter self-adaptation method for calculating incipient motion shear stress of cohesionless non-uniform sediment

作　　者：袁强 王成帝 罗永钦 彭浩 YUAN Qiang;WANG Cheng-di;LUO Yong-qin;PENG Hao(School of Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Power China Guiyang Engineering Corporation Limited,Guiyang 550081,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《泥沙研究》2024年第4期13-20,共8页Journal of Sediment Research

基　　金：云南省基础研究计划项目青年项目(202101AU070156);云南省基础研究计划项目面上项目(202301AT070437);云南省“兴滇英才支持计划”青年人才计划项目(KKRD202204020)。

摘　　要：非均匀沙起动条件的确定是研究非均匀沙输移的关键。工程实际应用中有修正法和等效粒径法两种,两种方法中含有的参数率定需要已知分组沙起动切应力测定值,且取值依赖率定数据集。基于两种方法在理论上计算的分组沙起动切应力相等思想,结合吴伟明提出的修正法与王涛提出的等效粒径方法,将两种方法中含有的率定参数作为自适配参数,通过函数拟合确定,拟合适配过程不依赖分组沙起动切应力数值。实践检验表明,通过自适配确定参数可以提高泥沙起动切应力计算方法的适用范围,精度更高。成果可以为非均匀沙起动条件计算提供新思路。The determination of the incipient motion condition is the key to studying the non-uniform sediment transport.the correction method and the equivalent particle size method have been widely applied in practical engineering.However,the parameter calibration contained in these two methods requires a known measured value of the incipient motion shear stress of grouped sediment,which depends on the calibration datasets.Based on the idea of equal incipient shear stress of grouped sediment calculated by the two methods in theory,Combining the Wu Weiming's correction method and Wang Tao's equivalent particle size method,the contained calibration parameters are used as self-adaption parameters,which can be determined through function fitting.The fitting process does not rely on the incipient motion shear stress value of grouped sediment.Practical tests have shown that determining parameters through self-adaptation can improve the applicability and accuracy of the calculation method for sediment incipient motion shear stress,which provides a new idea for calculating the incipient motion conditions of non-uniform sediment.

关 键 词：非均匀沙 起动条件 修正法 等效粒径法 参数 自适配 

分 类 号：TV142.1[水利工程—水力学及河流动力学]