涡河涡阳枢纽设计最低通航水位研究

Designed lowest navigable water level for Guoyang Hydro-junction on Guohe River

枢纽建设后对径流的调节破坏了上下游水位样本年际之间的一致性,使得设计通航水位确定的问题复杂化。针对梯级枢纽扩建船闸工程设计最低通航水位取值的问题,以涡阳枢纽复线船闸为例,对非一致性水位序列进行统计分析,选取代表性水文序列进行保证率水位计算,并与枢纽死水位、最低运行水位进行分析比较,并通过工程投资等因素探讨设计通航水位取值的合理性。结果表明,采用涡阳、蒙城枢纽死水位作为上下游设计最低通航水位,在满足通航保证率的同时具有较好的经济性,可确保梯级枢纽间水位衔接和船舶通航安全。

The adjustment of runoff by a hydro-junction after its construction destroys the inter-annual consistency among upstream and downstream water level samples,consequently complicating the determination of the designed navigable water level.Focusing on the problem of selecting the designed lowest navigable water level for a ship lock expansion project of a cascade hydro-junction,this paper discusses the double-line ship lock of the Guoyang Hydro-junction as an example.Specifically,it statistically analyzes the inconsistent water level sequence and selects the representative hydrological sequence for the calculation of the guaranteed water level.Then,the paper compares the guaranteed water level with the dead water level and the lowest navigable water level of the hydro-junction and discusses the rationality of the designed navigable water level selected according to factors such as project investment.The results show that using the dead water levels of the Guoyang and Mengcheng hydro-junctions as the designed lowest navigable water levels of the upstream and downstream can not only meet the navigation guarantee rate with favorable economy but also ensure the water level connection between the cascade hydro-junctions and the navigation safety of ships.