【摘要】 分汊河道航道整治工程涉及各汊道水沙条件及河床形态间的调整,始终是航道工程界关心的热门话题。基于平衡输沙原理和河相关系原理,提出分汊河道整治线宽度的计算公式和方法,结合长江下游东流水道航道整治工程实例,进行整治线宽度计算研究。结果表明:1)对于分汊河道,整治以后通航汊道的流量会有所改变,可能影响整治线宽度的确定;2)可以使用假定计算、进而校核、再行调整的方法,进行分汊河道整治线宽度计算;3)基于河相关系原理,提出分汊河道整治线宽度计算公式和方法,经实测资料验证,结果满意;4)在进行分汊河道整治线宽度计算时,既可以使用平衡输沙法,也可以使用河相关系法,两者结果差异较小;5)如果工程后通航汊道流量略有增加,则改正后的整治线宽度也将略有加宽,此时若仍然选用初始宽度是可以接受且偏于安全的。更多还原

【Abstract】 The waterway regulation project of branching channel involves the adjustment of flow and sediment conditions and river bed forms in each branch, and is a hot topic of concern in waterway engineering. Based on the theory of equilibrium sediment transport and the theory of morphological relationships, the calculation formula and methods of regulation width of branched reach were put forward. Combined with the regulation project of the Dongliu waterway in the lower Yangtze River, the regulation width was calculated and studied. The results show that: 1) for the branching channel, the distribution discharge of navigation branch will change after regulation, which may affect the determination of the regulation width; 2) the regulation width of branching channel can be calculated by assuming calculation, checking and readjusting; 3) based on the principle of morphological relationships, the calculation formula and method for the regulation width of braided river are put forward and verified by the measured data, the results are satisfactory; 4) methods based on both equilibrium sediment transport and morphological relationships can be used to calculate the regulation width of branching channel, and there is little difference between them; 5) if the flow rate of navigable branch increases slightly after the project, the corresponding regulation width should become slightly wider, so it is acceptable and safe if the original width remains the same.更多还原