摘要
黄河兰州城区河段受刘家峡水电站、小峡水电站等综合调节作用,河段水文条件变化复杂。为合理确定设计通航水位,根据河段水文特性及兰州站水位-流量变化关系,基于综合历时法、保证率频率法及图解适线法确定设计流量,采用曼宁公式并结合枢纽调度运行方式确定该河段下游末端相应的设计水位,建立一维数学模型对设计通航水位进行研究,得出黄河兰州城区段航道设计通航水位值。结果表明:设计最高通航流量下,工程河段为天然状态,可按3 a一遇流量与曼宁公式法推求尾门水位组合计算沿程设计最高通航水位;设计最低通航流量下,工程河段受小峡水电站回水影响,宜按90%保证率流量与小峡水电站坝前水位组合计算沿程设计最低通航水位。
The Lanzhou urban reach of the Yellow River is subject to the comprehensive regulation of Liujiaxia Hydropower Station and Xiaoxia Hydropower Station,and the hydrological conditions of the reach are complex.To reasonably determine the design navigable water level,according to the hydrological characteristics of the river section and the relationship between the water level-flow of Lanzhou Station,the design flow is determined based on the comprehensive duration method,the assurance rate frequency method and the graphical fitting method.The Manning formula is used to determine the corresponding design water level at the end of the reach in combination with the hub dispatching operation mode.A one-dimensional mathematical model is built to study the design navigable water level of the reach.The design navigable water level of Lanzhou urban reach of the Yellow River is obtained.The results show that under the design maximum navigable flow,the engineering reach is in a natural state,and the design maximum navigable water level along the way can be calculated according to the combination of the 3 a return period flow and the tailgate water level calculated by the Manning formula method.Under the designed minimum navigable flow rate,the engineering reach is affected by the backwater of Xiaoxia Hydropower Station.Therefore,it is advisable to calculate the designed minimum navigable water level along the route based on a combination of 90%guaranteed flow rate and the water level in front of the Xiaoxia Hydropower Station dam.
作者
吴凌波
祁永升
WU Lingbo;QI Yongsheng(CCCC Second Harbor Consultants Co.,Ltd.,Wuhan 430071,China)
出处
《水运工程》
北大核心
2023年第9期119-125,共7页
Port & Waterway Engineering
关键词
黄河
设计通航水位
数学模型
水文特性
the Yellow River
design navigable water level
mathematical model
hydrological characteristics
