Spur dike size determining method suitable for branched reach channel improvement

Abstract

The invention discloses a spur dike size determining method suitable for branched reach channel improvement. The spur dike size determining method sequentially comprises the following steps that firstly, a mathematical model between the spur dike size and the branch channel depth and split ratio is built, the branch channel split ratio and channel condition development tendencies before channel improvement are analyzed, and channel improvement targets are determined; secondly, according to the channel improvement targets, the split ratio decrease limit value capable of being borne by a navigation main branch channel after improvement is determined, and therefore the spur dike maximum water blocking area after improvement is determined; thirdly, multiple sets of spur dikes which meet the maximum water blocking area condition and are obtained through combination of different length and height sizes are designed; fourthly, through the mathematical model between the spur dike size and the branch channel depth and split ratio, the amplitude and range of channel depth increase generated by each spur dike after channel improvement is implemented are simulated and calculated; and fifthly, through comparison with the channel improvement targets, the design size, closest to that of the channel improvement targets, of the spur dike is selected out. According to the spur dike size determining method, the influence of the spur dikes on the branch channel split ratio and the like can be estimated in advance, and the channel improvement spur dike size can be determined reasonably.

Description

technical field [0001] The invention relates to a method for determining the size of a spur dike, in particular to a method for determining the size of a spur dike which is suitable for channel regulation of branched river sections. Background technique [0002] At present, the spur dam is a widely used adjustment project, which plays an important role in channel regulation. The root of the spur dam is connected with the river bank or the edge of the beach, and the head of the dam extends to the center of the river. The axis of the dam is perpendicular or oblique to the direction of the water flow. Its functions are mainly to fix the regulation line, adjust the width of the channel, control the water flow and increase the flow rate of the channel, so that the riverbed can be scoured in an appropriate amount to achieve the purpose of deepening the channel. When the shallow area is located in the branch, the narrow branch channel section of the tooth dam bundle is generally b...

AI Technical Summary

Problems solved by technology

This phenomenon is common in waterway regulation projects in the middle and lower reaches of the Yangtze River. However, at present, the analysis of this phenomenon is limited to the phenomenon analysis based on prototype observation and experimental simulation, and there is still a lack of theoretical quantitative research.

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