Generation method of design minimum navigable water level for runoff and tidal current transition downstream of hub

Abstract

The invention provides a hub downstream runoff and tide transition river reach designed minimum navigable water level generation method. The method comprises the steps of 1, determining the basic station designed minimum navigable flow and the lateral inflow; 2, building and verifying a plane two-dimensional water flow mathematical model; 3, determining the basic station navigable feature water level and the river reach along-way navigable characteristic water level; 4, selecting a typical tidal process and calculating the tidal influence range and the influence on the along-way designed minimum navigable water level; 5, selecting the hub discharge typical unsteady flow process and calculating the unsteady flow influence range and the influence on the along-way designed minimum navigable water level; 6, determining the river reach along-way designed minimum navigable water level. The problem that runoff and tidal transition river reach designed minimum navigable water level calculationmode is not consistent can be solved, meanwhile, the novel way is provided for designed minimum navigable water level generation on the condition that actual measurement data is not complete, and thetidal and hub discharged unsteady flow along-way influence and range can be obtained.

Description

technical field [0001] The invention belongs to the technical field of waterway engineering, and in particular relates to a method for generating the minimum navigable water level in the design of a transitional river section downstream of a hub. Background technique [0002] The design minimum navigable water level is the lowest water level for standard ships or fleets to navigate normally, and it is one of the key technical parameters in channel engineering. According to the code, the minimum navigable water level of inland waterway design is generally calculated by the frequency method or the guaranteed rate method, but these two methods are mainly based on daily average series data. The obvious river section downstream of the hub near the dam is not applicable. In these river sections, if the daily average series data are used, the influence of factors such as tides and unsteady flow discharged from the hub on the design minimum navigable water level needs to be further ...

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Problems solved by technology

However, the above methods generally require continuous hourly observation data for many years, and can only be calculated and analyzed for basic stations, and cannot reflect the influence of factors such as tides and unsteady flow discharged from the hub on the design minimum navigable water level along the river. When the dry water level changes significantly due to factors such as river bed erosion, the calculated design minimum navigable water level will also deviate due to the variation of the hydrological regime

[0003] The patent "Minimum navigable water level generation method for downstream rivers of reservoirs" applied by Wuhan University (patent application number 201210439901.1, publication number CN 102912760A) is mainly aimed at the design of minimum navigable rivers downstream of pivotal reservoirs with strong water regulation and storage capacity and long riverbed scour duration The calculation of the water level provides a method for generating the design minimum navigable water level under the hydrological variation environment, but this method cannot reflect the influence of tides and daily peak shaving of the hub power station on the design minimum navigable water level, so it is only applicable to the downstream of the hub where the discharge flow is relatively stable. Tidal river section, not suitable for the downstream runoff and tidal flow transition section of the daily regulation hub

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