A new type of overflow dam and its underflow energy dissipation method

Abstract

A novel body type overflow dam and an underflow energy dissipation method belong to the technical field of hydraulic engineering dam engineering design and relate to engineering design for medium and low water head overflow dams using underflow energy dissipation. Its characteristic is that the anti-arc section of the traditional overflow dam is cut off, and the water flow on the weir surface directly enters the stilling basin from the straight section, which shortens the length of the traditional stilling basin and raises the floor elevation of the stilling basin. The stilling pool is divided into two stages, which are stepped, and the water flow on the weir surface enters the groove of the stilling pool from the straight line. The effect and benefit of the present invention are: under the premise that the new body type overflow dam meets the design requirements and ensures the same discharge capacity as the conventional body type overflow dam, the section shape of the dam body is reduced, and the dam body concrete in the project is reduced. The consumption improves the energy dissipator downstream of the overflow dam, which can reduce about 50% of the energy dissipator engineering quantity and save 20-30% of the bottom flow energy dissipator investment.

Description

technical field [0001] The invention belongs to the technical field of dam engineering design for hydraulic engineering, and relates to engineering design for medium and low head overflow dams using underflow energy dissipation, in particular to a new body type overflow dam and an underflow energy dissipation method. Background technique [0002] At present, in actual engineering, the overflow dams with medium and low water heads and even a few high water heads adopt bottom flow energy dissipation, which are composed of traditional overflow dams and stilling basins. The overflow surface of traditional overflow dams generally consists of three parts: the crest curve section, the middle straight section and the lower anti-arc section. The main problems of traditional overflow dams are: the cross-sectional area is large, so that the amount of concrete used for the dam body is huge, and the downstream underflow energy dissipation works are also relatively large. [0003] Aiming...

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Problems solved by technology

However, the studies on the shape of the overflow dam in these literatures basically focus on the research on the curve of the upstream section and the curve of the downstream se

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