Method for determining criteria and quantity value for adding abnormal flood discharge facilities to special-grade dam

Abstract

The invention relates to a method for determining criteria and a quantity value for adding abnormal flood discharge facilities to a special-grade dam. The method comprises the steps of setting an upstream flood hygrograph of the special-grade dam; setting a water discharge capacity reduction amplitude of the water dam; setting a starting regulation level; calculating a water level; forming the criteria for adding the abnormal flood discharge facilities; and forming the specific discharge quantity value for adding the abnormal flood discharge facilities. According to the method, whether the design of the water dam without abnormal flood discharge measures can ensure flood discharge and dam safety under an extreme extra standard flood condition or not can be rechecked; and whether the original design considers flood discharge and dam safety under a condition of flood check and a condition of failure of a water discharge gate or not is further rechecked. The given criteria and quantity value for adding the abnormal flood discharge facilities to the special-grade dam can be directly used for aided design; a design basis is provided for lowering a flood discharge risk of cascade control; and the deficiencies of no standard reference and fuzzy existing basis of conventional abnormal flood discharge facility design are overcome.

Description

Criterion and value determination method for adding extraordinary flood discharge facilities to super dams technical field The present invention relates to a criterion and value determination method for adding extraordinary flood discharge facilities to super dams, which is a basis for hydraulic design and a risk prevention and control method for reservoir groups, and a method for cascade reservoir groups to control the addition of extraordinary flood discharge facilities to cascade super dams The criterion and value determination method is an analysis and calculation method to reduce the risk of controlling cascade flood discharge by adding extraordinary flood discharge facilities for super dams under different cascade layout schemes or starting temporary measures at higher water levels. Background technique With the acceleration of the frequency of global extreme climates, the flood design standards of reservoir dams are constantly improving. The concept of the possible m...

AI Technical Summary

Problems solved by technology

1) The earth-rock dam is high and has a large reservoir, and the risk potential energy is high. After the accident, it will seriously threaten the first-level water-retaining structures or important cities downstream;

2) When designing according to PMF, it is not economical to set up a normal spillway;

3) Insufficient hydrological series data cannot correctly select the design flood or check flood;

4) There is the possibility of extreme working conditions such as dam failure, excessive flood caused by extreme weather, and poor drainage caused by earthquake gate damage

It can be seen from the above compliance conditions that the planning and design of cascade reservoirs can only be used as a general reference, especially when considering the extreme working conditions of cascade reservoirs in the river basin. method, leading to the adoption of improving the safety level of the dam or raising the elevation of the dam crest to resist risks during the design, thereby increasing a large amount of investment

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