Stepped weir for straight river channel

Abstract

The invention relates to a stepped weir for a straight river channel. The stepped weir is characterized by comprising a trapezoidal weir and / or a W-shaped weir arranged between a first river bank and a second river bank, wherein the trapezoidal weir and the W-shaped weir are in an isosceles trapezoid and in a W shape, respectively, along the water flow direction in a river channel between the first river bank and the second river bank; symmetry planes of the trapezoidal weir and the W-shaped weir are both overlapped with the central plane of a river width; heights of the trapezoidal weir and the W-shaped weir are both lower than or equal to planes on which the top parts of the first river bank and the second river bank are located; elevations of main body parts of the trapezoidal weir and the W-shaped weir gradually increase along the water flow direction; and at least one recirculation zone is formed in the downstream direction of the water flow. The stepped weir provided by the invention is capable of weakening energy, maintaining the stability of the river channel, increasing a habitat for aquatic organisms and favorably increasing biodiversity of the river channel, and can be widely applied to river channel regulation works.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, in particular to a stepped weir for straight river channels. Background technique [0002] In traditional river improvement projects, the flood control function is one-sidedly emphasized, and the riverbed that has been reconstructed on the cross section often adopts a single section with good water transfer performance and convenient construction, so that the water flow rate is uniform. In addition, river dredging projects mainly focus on the amount of dredging works, often adopting river regulation projects such as cutting bends and straightening, normalizing river sections, and river hardening, which change the original natural environment of the river and reduce the aeration of water flow. Without sufficient contact with oxygen, the self-purification ability of the water body is very poor, and the water quality tends to deteriorate, resulting in the degradation of ecologi...

AI Technical Summary

Problems solved by technology

In addition, river dredging projects mainly focus on the amount of dredging works, often adopting river regulation projects such as cutting bends and straightening, normalizing river sections, and river hardening, which change the original natural environment of the river and reduce the aeration of water flow. Insufficient contact with oxygen, the self-purification ability of the water body is very poor, the water quality tends to deteriorate, resulting in the degradation of ecological functions, unable to provide various habitats, foraging, breeding and shelters for aquatic organisms, which is not conducive to ecological diversity

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