Trajectory energy dissipation and scouring preventing method of spillway of small and medium-sized reservoir

Abstract

The invention discloses a trajectory energy dissipation and scouring preventing method of a spillway of a small and medium-sized reservoir. The method comprises the step of correspondingly excavatinga flip bucket, a plunge pool and a retention wall in the flowing direction of a trajectory nappe of the spillway, wherein the flip bucket is at the upstream of the trajectory nappe; the plunge pool ispositioned at a scouring pit of the trajectory nappe; and the retention wall is at the downstream of the trajectory nappe. With the adoption of the method, the energy can be dissipated; the scouringis prevented; and the construction is quick.

Description

technical field [0001] The invention relates to a spillway deflecting energy dissipation technology, in particular to a spillway deflecting energy dissipation and scour prevention method for small and medium-sized reservoirs. Background technique [0002] When the spillway in the water conservancy project discharges water, the potential energy is converted into kinetic energy, which can cause the scour of the downstream river bed, endangering the safety of the spillway and other buildings. The main means of prevention and control of this safety problem is energy dissipation, and the auxiliary measure is anti-shock. At present, the energy dissipation methods commonly adopted are: bottom flow energy dissipation, deflecting flow energy dissipation, and surface flow energy dissipation. [0003] The above several energy dissipation methods have the following problems: [0004] (1) Underflow energy dissipation [0005] Underflow energy dissipation has a long history. It is wide...

AI Technical Summary

Problems solved by technology

The existing problems of bottom flow energy dissipation are: the stilling pool has a large amount of work, and it is an underwater project, which has high cost and affects the construction period; when the discharge drop is large, care must be taken to prevent cavitation damage caused by high-speed water flow to the flow surface; When the gate is not operating properly, three-dimensional flow may occur in the stilling basin, and the return flow with gravel may wear the stilling basin

The existing problems are the variability and instability of the flow regime, requiring a large and stable water depth in the downstream; the surface flow waves have severe erosion on the downstream bank slope, and the dam toe and the downstream guide wall are prone to erosion.

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