Partial water cushion pond type stilling basin

Abstract

The invention relates to a water conservancy facility, specifically a partial water cushion pond-type stilling pond, which sequentially includes a falling sill, a front shallow water cushion, a water cushion pond, a rear shallow water cushion, a tail sill and a downstream apron; the bottom of the falling sill is connected to the front shallow water cushion , the rear side of the front shallow water pad is the sinking water pad pond, the rear side of the water pad pond is the raised rear shallow water pad, and the rear side of the rear shallow water pad is the tail sill. In the partial water cushion pond type stilling pond provided by the present invention, the shallow water cushion part before and after the stilling pond can play the water cushion buffering effect of the conventional stilling pond when the downstream water level is high, and the water cushion pond in the middle part can form a For deeper water pads, the water flow forms a vortex in the pad pond, avoiding direct impact on the bottom plate of the stilling tank, which can effectively reduce the flow velocity at the bottom, and then dissipate the remaining part of the energy when passing through the tail sill downstream, ensuring good energy dissipation In addition to the effect, it can also protect the bottom plate of the stilling pool to a certain extent, and has a strong adaptability to the discharge flow.

Description

technical field [0001] The invention relates to a water conservancy facility, in particular to a local pad pond type stilling pond. Background technique [0002] Underflow energy dissipation is a form of energy dissipation that utilizes hydraulic jumps to transform the flow state and disinfect energy in the stilling pool. Underflow energy dissipation is not limited by the foundation, and has the advantages of stable flow state and little influence of atomization. The flow velocity is generally large, and the hydraulic jump flow state is restricted by the inlet Froude number and the downstream water depth, so the adaptability is relatively small. Water cushion ponds are mostly used in deflected flow energy dissipation methods. They have a simple shape, low requirements for upstream and downstream water flow conditions, and strong adaptability, but have high requirements for riverbed geological conditions, and the impact pressure of the bottom plate is large. The requirements ...

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Problems solved by technology

[0002] Underflow energy dissipation is a form of energy dissipation that utilizes hydraulic jumps to transform the flow state and disinfect energy in the stilling pool. Underflow energy dissipation is not limited by the foundation, and has the advantages of stable flow state and little influence of atomization. The flow velocity is generally large, and the hydraulic jump flow state is restricted by the inlet Froude number and the downstream water depth, etc., and the adaptability is small

Water cushion ponds are mostly used in deflected flow energy dissipation methods. They have a simple shape, low requirements for upstream and downstream water flow conditions, and strong adaptability, but have high requirements for riverbed geological conditions, and the impact pressure of the bottom plate is large. The requirements are high, and the ridge itself is prone to damage under the action of high-speed water flow. In addition, the influence of atomization downstream of the energy dissipation of the deflection is generally relatively large

[0003] In general shallow water cushion stilling pools, the water cushion formed at the bottom of the pool is used as a "flexible floor" to exert an opposite flexible force on the water flowing into the pool to reduce the hydraulic index near the bottom. However, for large flow discharge, separate Shallow water pad stilling pool is used, the energy dissipation water body is insufficient, so the energy dissipation effect is limited

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