Multi-reverse-slope type stilling pool

Abstract

The invention discloses a multi-reverse-slope type stilling pool which comprises a bottom plate and side walls on the two sides of the bottom plate. An apron used for connecting the stilling pool and a downstream bed is arranged at the downstream tail end of the stilling pool. The portions, along the two side walls of the stilling pool, of the bottom plate of the stilling pool are each provided with a side wall reverse slope connected with a flow guide slope. The slope aspect of the side wall reverse slopes is parallel to that of the two side walls. The structure and the size of the side wall reverse slopes are the same as those of the side walls. Multiple middle reverse slopes are arranged on the portions, between the two side wall reverse slopes, of the bottom plate of the stilling pool at intervals, wherein the structure and the size of the middle reverse slopes are the same as those of the side wall reverse slopes, and the middle reverse slopes are connected with the flow guide slopes. A connecting slope is arranged at the tail end in the water flow direction of each side wall reverse slope, wherein the slope aspect of the connecting slope is opposite to that of the side wall reverse slope, the connecting slope is as tall as the side wall reverse slope, and the connecting slope is used for connecting the side wall reverse slope and the apron. A connecting slope is arranged at the tail end in the water flow direction of each middle reverse slope, wherein the slope aspect of the connecting slope is opposite to that of the middle reverse slope, the connecting slope is as tall as the middle reverse slope, and the connecting slope is used for connecting the middle reverse slope and the apron. Horizontal sand flushing channels penetrating the stilling pool longitudinally are formed in the portions, between the side wall reverse slopes of the bottom plate of the stilling pool, between the middle reverse slopes and between the connecting slopes, of the bottom plate of the stilling pool. The stilling pool can increase the energy consumption rate and reduce the problem of sediment accumulation in the stilling pool.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation facilities in water conservancy and hydropower projects, and particularly relates to a multi-reversed slope stilling pool for low water head hydropower stations with low Floyd's number and large single-width flow on sandy rivers. Background technique [0002] In the construction of water conservancy and hydropower projects, the downstream energy dissipation and anti-scour of the discharge structure is one of the complex issues directly related to the safety of the project. A batch of large-scale water conservancy and hydropower projects that have been built, are under construction, or are planned to be built in the middle and lower reaches of some major rivers in my country. The dams are generally not very high, but the flood flow is very large. Had to use a large single-width flow, such as the Wuqiangxi and Yantan projects, the maximum single-width flow across the dam is 280m ...

AI Technical Summary

Problems solved by technology

The existing research results show that when the pre-jump Floyd's number is less than 4.5, the energy dissipation rate of the underflow hydraulic jump is below 40%, and the low energy dissipation rate will bring a series of engineering safety problems

Moreover, the use of bottom flow energy dissipation in sandy rivers often causes a large amount of sediment to accumulate in the stilling pool, which greatly affects the normal operation of water conservancy and hydropower projects.

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