Hydropower station bank slope and stilling pool combined energy dissipation method

Abstract

The invention discloses a hydropower station bank slope and stilling pool combined energy dissipation method, which is characterized in that: a trapezoidal bank slope with a gradient of less than 70 DEG is built below a water outlet of a spillway of a hydropower station; the lower end of the bank slope is jointed with a river bed; a water flow passing through the water outlet of the spillway flows down from the bank slope to reduce unit discharge and wash a natural stilling pool on the edge of the river bed; and after the energy of the water flow is dissipated by the bank slope and the natural stilling pool jointly, the water flow passing through the water outlet of the spillway is discharged along the river bed. In the method, the bank slope can be built by leveling and lining a natural bank slope and made into a trapezoid with a narrow upside and a wide downside; while the water flow passing through the water outlet of the spillway is discharged downward along with the trapezoidal bank slope, the unit discharge of the water flow discharged downward is reduced; the water flow discharged downward washing a downstream river bed close to the edge of the bank slope to make a scour pit; and the scour pit serving as a natural stilling pool allows the water flow discharged downward to make a jump so as to dissipate the energy of the water flow. The method can produce desirable energy dissipation effect and can effectively save the space occupation of buildings.

Description

technical field [0001] The invention relates to the field of water conservancy engineering, in particular to a combined energy dissipation method of a bank slope of a hydropower station and a natural stilling pool. Background technique [0002] At present, with the gradual development of hydropower resources in mountainous rivers in my country, the development of hydropower engineering construction in China has entered a climax stage, especially in the western mountainous areas where a large number of small and medium hydropower stations have been built. The water flow in natural rivers is generally slow flow, and the single-width discharge is evenly distributed along the river width direction. However, when discharge structures such as dams and sluices are built in the river channel, the flow conditions in the river channel have changed greatly. destructive power. If this problem is not solved in actual engineering, it will not only cause serious erosion and siltation in ...

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Problems solved by technology

Although the deflecting flow energy dissipation has the advantages of simple structure, can effectively control the position, range and flow distribution of the jet falling into the downstream river bed, has strong adaptability to tailwater amplitude change, and has the advantages of small engineering quantity, it has become the most widely used energy dissipation method in engineering. , but in engineering practice it also has the following disadvantages: the downstream local erosion problem is more serious, there are more accumulations, and the tail water fluctuation and atomization are relatively large

The method of building stilling pools for energy dissipation often has the advantages of stable flow, good energy dissipation effect, strong adaptability to geological conditions and tailwater amplitude, and small water atomization. However, building water conservancy projects in mountainous rivers During the project, according to the aforementioned characteristics of mountainous rivers, there are often problems such as long building aprons, insufficient space for building layout, large excavation volume of earthwork and concrete volume, and high project cost.

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