Flood discharge and energy dissipation structure of high arch dam in narrow valley and deep tailwater

Abstract

The invention discloses a high-arch-dam flood discharge and energy dissipation structure of a narrow river valley and deep tail water. An upper-layer hole and a lower-layer hole are distributed on a dam body; two dams do not need to be arranged at the downstream of the dam to form a closed water cushion pool; and only a concrete apron and revetments at two banks need to be arranged. The upper-layer hole adopts combined outflow of an overlooking angle with a small angle and a depression angle with a small angle; and the lower-layer hole adopts narrow seam type outflow of a flat bottom angle, two-side shrinking and vertical dispersion, and discharged water flows of the upper-layer hole and the lower-layer hole are not collided in the air. The two paths are not arranged; and the outflow of the upper-layer hole is controlled to be the smaller angle so as to control the degree and the range of a drop point and atomization of a water tongue. According to the high-arch-dam flood discharge and energy dissipation structure, the characteristic of a water depth of a three-dimensional space dispersed energy dissipation and downstream energy dissipation region is sufficiently utilized, so that the structure form of an energy dissipation and protection facility is simplified, the damages and influences on an ecological environment and a side slope of a nodal region are reduced, the construction difficulty is reduced, and the engineering amount and the engineering investment are reduced; and therefore, good social benefits and economic benefits are obtained.

Description

technical field [0001] The invention relates to a flood discharge and energy dissipation structure in a water conservancy and hydropower project, in particular to a high arch dam flood discharge and energy dissipation structure with narrow valleys and deep tail water in a canyon area. Background technique [0002] Arch dams are generally set in canyon areas, and high arch dams usually use the dam body to set up orifices for flood discharge, so that the discharged water collides in the air or pulls the water tongue in the air to partially dissipate energy; For protection issues, two dams are often arranged to form a closed water cushion pond to provide the water depth required for energy dissipation, and the discharged water falls into the water cushion pond for energy dissipation. [0003] However, the above-mentioned methods often lead to greater impact and protection range of flood discharge atomization, greater damage and impact on the ecological environment and the slope...

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Problems solved by technology

[0003] However, the above methods often lead to a greater impact on flood discharge atomization and protection range, greater damage and impact on the ecological environment and the slope of the hub area, complex energy dissipation structure, difficult construction, large amount of protection engineering and engineering investment

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