长江上游东溪口新开卵石航槽挖槽尺寸探讨

Dredged dimension for the additional gravel channel of Dongxikou waterway in the upper reach of the Yangtze River

提出了基于卵石河流河相关系与最大输沙率确定挖槽宽度的方法。以长江上游东溪口水道整治为例,选用Einstein修正式、Ackers输沙率公式计算整治水位时最大输沙率所对应的挖槽宽度范围,运用河相关系法计算其稳定河宽。结果表明:两种方法确定的稳定挖槽宽度范围基本一致。通过数学模型优化挖槽断面设计,确定出东溪口水道的最佳挖槽尺寸,满足卵砾石航槽稳定和船舶航行的要求。

A method for determining the width of the excavation groove is proposed based on the relationship between the river facies and the maximum sediment transport rate of the pebble river.Taking Dongxikou waterway regulation in the upper reaches of the Yangtze river as an example,Einstein’s formal and flexible sediment transport rate formulas are used to calculate the width range of the excavation groove corresponding to the maximum sediment transport rate at the remediation water level,and the stable river width is calculated by using the method of river relationship.The results show that the width ranges of stable excavation groove determined by the two methods are basically the same.The optimal size of Dongxikou channel is determined by optimizing the section design of the excavation groove through mathematical model,which can meet the requirements of stability of the gravel channel and ship navigation.