基于极速法的卵石浅滩整治线宽度的确定  

Determination of Width of Regulation Line in Pebble Shoal Based on Extreme Speed Method

作　　者：许光祥[1] 蒋孜伟 XU Guangxiang;JIANG Ziwei(School of River&Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China;Key Laboratory ofHydraulic and Waterway Engineering of Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,P.R.China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学水利水运工程教育部重点实验室,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2019年第12期86-91,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家重点研发计划项目(2018YFB1600400);重庆市基础研究与前沿探索项目(cstc2018jcyjAX90534)

摘　　要：常规卵石浅滩整治线宽度的确定方法如河相关系法、水力学法、河流动力学法及经验法等,不能充分体现浅滩的基本特性。提出了一种基于浅滩断面形态、航槽布置位置、流速分布等特性的整治线宽度计算方法——极速法;引入航槽水深系数ηH、航槽流速系数ηV、急滩上滩水力指标E C等参数,导出了体现滩险个性的整治线宽度计算公式;借助平面二维水流数学模型,采用极速法对长江上游白沙水道河段梨子碛卵石浅滩的整治线宽度B 2进行了验算。结果表明:用极速法计算得到的整治线宽度范围B 2=436~440 m,与实际工程吻合(长江上游宜宾—重庆河段实际工程的整治线宽度范围B 2=400~500 m),说明极速法计算式合理可行,可应用于类似浅滩整治工程的设计及方案优化。The conventional methods to determine the width of the regulation line in pebble shoal,such as hydraulic geometry relation method,hydraulic method,river dynamics method and empirical method,can not fully reflect the basic characteristics of the shoal.Based on the characteristics of the section shape of the shoal,the layout position of the channel and the velocity distribution,a method called extreme speed method for calculating the width of regulation line was put forward.By introducing the parameters such as dredged channel water depth coefficient(ηH),dredged channel velocity coefficient(ηV)and hydraulic index of ascending rapids(E C),the calculation formula of the width of regulation line reflecting the characteristics of rapids was derived.Using plane two-dimensional flow mathematical model,the width of regulation line B 2 of the Liziqi pebble shoal in Baisha waterway reach of the upper reaches of the Yangtze River was checked by extreme speed method.The results show that the width range of regulation line B 2 calculated by extreme speed method is 436~440 m,which is consistent with the practical engineering(the width range of regulation line B 2 of Yibin-Chongqing reach in the upper reaches of the Yangtze River is 400~500 m).The calculation formula of extreme speed method is indicated to be reasonable and feasible,which can be applied to the design and scheme optimization of similar shoal regulation projects.

关 键 词：港口航道工程 卵石浅滩 整治线宽度 极速法 航槽流速系数 

分 类 号：TV133[水利工程—水力学及河流动力学]