Method for regulating straight channel of sand cobble bifurcated shoal of transition section

Abstract

The invention discloses a method for regulating a straight channel of a sand cobble bifurcated shoal of a transition section. The method for regulating the straight channel of the sand cobble bifurcated shoal of the transition section includes the steps that a wide and shallow cross section type long straight channel is developed in a dried bifurcated riverway of the transition section for navigation, meanwhile the water flow structure is adjusted by a regulating structure, and thus the sand delivery capacity in the navigation channel is enhanced. According to a method for discriminating the stability of the navigation channel of the sand cobble bifurcated shoal of the transition section, it should be guaranteed that bed loads entering the straight channel before and after the channel is excavated have the same starting conditions to guarantee the channel excavation stability, and in practical application, control is performed through bed load starting conditions under regulation flow. The method for regulating the straight channel of the sand cobble bifurcated shoal of the transition section is applied to regulation of the navigation channel of the Shenbei mouth of the Changjiang River and regulation engineering of the navigation channel of the Tonggu shoal of the Changjiang River, the shifting bed model test result shows that after the regulation, the navigation depth requirement is met, and the straight channel excavation stability is good.

Description

technical field [0001] The invention belongs to the research field of waterway regulation, and in particular relates to a method for regulation of a sandy pebble branched shoal straight channel in a transition section and a method for judging the stability of a navigation channel. Background technique [0002] The branched river sections of the Xuyu section of the Yangtze River mostly appear in the widened section downstream of the curved and narrow river section, and most of them are in the shape of two branches. . In Tonggutan and Shenbeizui river sections, there is also a central shoal or dark moraine in the middle of the dry river channel, which further divides the dry river channel into left and right channels. Among them, the branch near the river bank is often curved and narrow and deep, and the inlet is curved, shallow, and has strong oblique flow; the middle and lower sections have a small bending radius, and the channel excavated at the edge of the moraine wing is...

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Problems solved by technology

[0004] The waterway manual compiled by the Yangtze River Waterway Bureau believes that under the premise of meeting the scale requirements of the waterway, it is better to adopt a relatively narrow and deep section for excavation, but this conclusion has no theoretical basis, and there is no practical evidence for sand and pebble trenching engineering

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