Arch dyke line of river confluence area, method for creating arch dyke line and application of arch dyke line

Abstract

The invention discloses a method for creating an arch dyke line of a river confluence area. A conventional river confluence model is established and the lengths L, the widths b and the water depths h of a flow separation zone of the river confluence area are calculated under different confluence rates RQ through Fluent numerical simulation software, curve fitting is conducted, the relation between the lengths, the widths and the depths of the flow separation zone and the confluence rates RQ is created, testing arch dyke line river confluence models under the different confluence rates RQ are established, the water depths h' of the testing arch dyke line river confluence areas corresponding to the different confluence rates RQ are calculated, the relation between the water depth reduction rates (h'-h) / h and the confluence rates RQ is created, and according to the relation between the water depth reduction rates (h'-h) / h and the confluence rates RQ, the relation between L / Bm and the RQ and the relation between b / Bm and the RQ, the confluence rate enabling the water depth reduction rate to meet the actual engineering requirement and enabling the construction project amount to be minimum is selected to calculate the 1 / 4 ellipse arch dyke line satisfying the elliptic equation shown in the specification. The arch dyke line can be applied to the river confluence area with the confluence angle between the main river and the branch river being 90 degrees.

Description

technical field [0001] The invention belongs to the technical field of flood control dikes in river confluence areas and construction thereof, in particular to an arcuate dike line in river confluence areas and its construction method and application. Background technique [0002] my country is rich in water resources and has many rivers, forming many huge water systems composed of mainstreams and tributaries, making the confluence of rivers common. Due to the particularity and complexity of the converging water flow, for example, the backwater effect will be generated after the main and tributary rivers meet, the water flow will produce a jacking effect on each other, and the separation zone, secondary flow, and high water level will be generated after the confluence. It has a great impact on river bed evolution, flood control and river navigation in the river confluence area. [0003] For example, at the confluence of rivers, due to the mutual support of two streams of wa...

AI Technical Summary

Problems solved by technology

In addition, the turbulent mixing effect caused by the collision of the water flow in the confluence area is strong, and the energy loss is very large. The original water-sediment balance state of the main branch river is broken, which will cause sediment particles, especially coarse-grained pebbles, to deposit in the separation area. , forming estuary shoals or river middle shoals (islands), which reduces the effective water-passing area of ​​the river, which not only affects navigation and flood discharge capacity, but also raises the water level at the confluence of rivers, which also poses a threat to the flood control dike line

Because the current design of flood embankment is only calculated based on the existing hydrological data of the river, the influence of the separation area on the water level is generally not considered. It will overflow the flood embankment and cause damage to people's life and property

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