An ecological discharge device for dams in alpine regions

Abstract

The invention discloses an ecological discharge device for a dam in an alpine region, comprising a dam building and a siphon pipe, the upstream dam surface of the dam building is a vertical dam surface, and the siphon pipe includes a water inlet pipe section and a water delivery pipe section As well as the energy-dissipating pipe section, the water inlet of the siphon pipe is located below the minimum operating water level of the upstream reservoir area, the water outlet of the siphon pipe is located at the slope foot of the downstream dam surface of the gate and dam building, the water outlet is equipped with a valve, and the water delivery pipe section at the top of the dam The highest section is connected to the auxiliary pipeline, and the auxiliary pipeline is connected to the vacuum pump and the electric butterfly valve. The outer wall of the water inlet pipe section is equipped with an anti-freezing device, and the siphon pipeline is fixed by cast-in-place reinforced concrete townships, buttresses and support rings. The invention can not only solve the problem of ecological discharge, but also prevent the longitudinal displacement of the ice cover in the upstream reservoir area from dragging or lifting the water inlet pipe section. In addition, the energy dissipation pipe section reduces the impact of the outlet water flow on the downstream river bed without affecting the flow rate. scour.

Description

technical field [0001] The invention relates to the fields of water conservancy and environment, in particular to an ecological discharge device for dams in alpine regions. Background technique [0002] The high water level of the hydropower station in the upper reaches of the river through the barrage and dam structure will cause the flow of the middle and lower reaches of the river to stop and reduce, and affect the ecological environment of the downstream. Therefore, it is necessary to replenish the downstream water volume through discharge to maintain the minimum water consumption of the ecological environment. At present, ecological discharge facilities are usually installed in completed hydropower stations, such as opening gates with small openings, burying discharge pipes inside existing dam buildings, or adding ecological units to solve the problem of ecological discharge. However, the long-term operation of the gate with a small opening will cause fatigue damage to...

AI Technical Summary

Problems solved by technology

However, in the alpine region, due to the freezing of the water surface and the rise and fall of the water level in the upstream reservoir area, the longitudinal displacement of the ice cover will cause the longitudinal drag or lift of the siphon pipe, so the technical solution provided by this patent is not suitable for the alpine region; in addition, the patent utilizes Disturbance of the water body near the water outlet dissipates the energy of the outlet water flow, which is not suitable for the operating conditions where the downstream water level is low or even dry when the ecological discharge occurs in the dry season, and it is difficult to submerge the water outlet

At the same time, when the pressurized pipe flow flows freely, the acting head is the height difference between the upstream water surface and the pipe outlet, while when the flow is submerged, the acting head is the height difference between the upstream and downstream water surfaces. The submerged flow is more than the free flow to submerge the outlet. Therefore, when the flow rate required for ecological discharge is the same, the use of this energy dissipation method will increase the diameter of the siphon pipe and increase the project cost

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