航电枢纽调节山区航道设计最高通航水位的确定

航电枢纽人工调节将引发下游航道水位和流速的变化,对船舶通航条件带来较大影响。针对航电枢纽调节下典型山区航道——兰江航道,采用数值模拟手段,计算航道上游规划姚家枢纽和灵马枢纽建成后,不同重现期洪水下的水位、流速分布等水力特性,最终得到航道设计最高通航水位。计算结果表明:10 a和5 a重现期下航道特征水位超过警戒水位较多,不利于河道防洪和航行安全;3 a重现期洪水对应水位的局部分航段流速较大,影响航道运行安全和航道运输的综合效益;结合航道建设和运行的经济效益、航道以及行船安全,认为以2 m/s适航流速作为参考条件、经试算获得的90%洪水频率对应的特征水位作为兰江航道设计最高通航水位较为合理。

Determination of designed highest navigable water level of mountainous waterway due to navigation-power junction regulation

The navigation-power junction artificial regulation will cause the change of water level and velocity in the downstream channel,and affect the the condition of navigation.Based on the the typical mountainous waterway,Lanjiang under the navigation-power junction regulation,a numerical model is established to study the hydraulic characteristics of water level and velocity change under different return periods after the completion of Yaojia hub and Lingma hub,and the designed highest navigable water level is obtained from the simulation.The results show that:The characteristic water level under the flood of once 10 years and once 5 years is much bigger than the warning water level,and the velocity of partial area is large under the case of the flood of once 3 years;These go against the safety of navigation;Combining the construction of waterway and economic benefits and the safety of running,and according to the control velocity obtained by the synthetic duration curve method,the water level under the case of 90% flood frequency should be considered as the designed highest navigable water level.