Abstract: 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 (EC), 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 B2 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 B2 calculated by extreme speed method is 436~440 m, which is consistent with the practical engineering (the width range of regulation line B2 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.

Key words: port and waterway engineering, pebble shoal, width of regulation line, extreme speed method, dredged channel velocity coefficient

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EC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B2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B2=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B2=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。

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