Prediction method of depth-averaged two-dimensional water flow direction in curved compound channel with submerged vegetation on beach

Abstract

The invention discloses a method for predicting the water depth and average two-dimensional water flow direction of a curved compound channel with submerged vegetation on the beach, which only needs to be based on the relative vegetation water depth, the geometry of the bend section and the position of the section to be predicted in the curved compound channel with vegetation on the beach. The prediction of the average two-dimensional water flow direction of any section between the entrance section and the curved top section of the curved compound channel not only has high prediction efficiency and accuracy, but also does not require flow velocity measurement or other exploration work. In this paper The domain has broad generality.

Description

technical field [0001] The invention belongs to the field of hydraulics and river dynamics, and relates to a method for predicting the average two-dimensional water flow direction of a curved river channel, in particular to a method for predicting the average two-dimensional water flow direction of a curved compound channel with submerged vegetation on a beach. Background technique [0002] In order to maintain the scouring and deposition balance of its own riverbed, the channel usually evolves and develops into a relatively stable curved channel by itself. Most of the time of the year, the upstream flow is small, the water body moves downstream along the curved main channel, and the beaches on both sides do not flow. Because of its proximity to water sources, the beach is an ideal habitat for vegetation, and therefore, a large number of vegetation grows on the beach. When the flood season comes, the flow from upstream increases, the water depth increases, and the water flo...

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Problems solved by technology

[0005] Although some studies have pointed out that the two-dimensional flow direction of water depth and relative vegetation water depth Drv of the curved main channel of the compound channel with submerged vegetation in the beach, the angle between the entrance section and the top section of the bend θ geo , The angle θ between the section at any position x between the entry section and the top section and the top section x The three elements are related; however, so far, there are not many researches on curved compound channels with submerged vegetation in the beach at home and abroad, and no further research has proposed an average two-dimensional water flow direction of the curved main channel with a clear mechanism, simple structure, and accurate calculation. method of prediction

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