A combined super-discharging energy-dissipating flood unit and method

Abstract

The invention relates to an integrated super-discharge energy-dissipation flood-overflowing unit. The unit comprises an inlet overflow weir, wherein a chute is formed in the downstream of the inlet overflow weir; a water-falling energy dissipater is formed in the chute; the inlet overflow weir is a compound key overflow weir; the compound key overflow weir comprises a weir body; a forward triangular pier and a reverse triangular pier with horizontal bottom surfaces are staggered at the top of the weir body; the length in the water flow direction of the bottom surfaces of the positive triangular pier and the reverse triangular pier exceeds the thickness of the top end of the weir to form a weir front cantilever and a weir rear cantilever; a partition is arranged between the positive triangular pier and the reverse triangular pier. Compared with the conventional overflow weir, the compound key overflow weir has the advantages that the flow coefficient is remarkably increased; water heads acting on the weir are obviously reduced, so that a condition of heightening the dam for dealing with the exceeding flood caused by dam break and extreme climate. The integrated super-discharge energy-dissipation flood-overflowing unit is simple in structure and low in upgrading, improving and maintaining costs; by virtue of the open type arrangement, the sand is easily discharged; the unit is especially suitable for upgrading and improvement of the built wide-top weirs or practical weir flood spillway.

Description

technical field [0001] The invention relates to a combined super-discharging energy-dissipating spillover unit and a method, and is a hydraulic facility and a method, and is a hydraulic facility and a method for a spillway of a reservoir. Background technique [0002] Spillway is the most common water discharge control structure, which is generally used to vent the flood that cannot be accommodated by the planned storage and prevent flood from overflowing. For earth-rockfill dams, rockfill dams and some concrete dams, they need to be located on the bank or outside the dam body. The shore spillway is set at the natural pass. With the increasing frequency of extreme weather, the flood design standards of reservoir dams are constantly improving, because many existing rivers or river systems in the basin have become very complex, such as reservoirs formed by cascade development. Disaster factors such as dam breaks, extreme weather and other excessive floods. This puts forward ...

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Problems solved by technology

[0004] In order to overcome the problems of the prior art, the present invention proposes a combined super-discharging energy-dissipating spillover unit and method. On the premise of reducing the engineering quantity as much as possible, a composite piano key overflow weir is added at the entrance of the spillway to improve the overflow weir The single-width flow rate and the discharge coefficient are significantly increased, which improves the problem of low energy dissipation efficiency of traditional overflow weir drainage

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