Composite weir for draining density current

Abstract

A composite weir for draining density current belongs to the technical field of hydraulic engineering and comprises a water diversion guide wall, a water drainage weir and a guide wall support, wherein the top edge of the water diversion guide wall is higher than the top of the water drainage weir; and the guide wall support is positioned at the bottom of the water diversion guide wall and is fixedly connected with and supported on a water body bed, thus realizing that the water diversion guide wall suspends in the air and the bottom edge of the water diversion guide wall is higher than the water body bed. The composite weir ensures the density current which has higher density at the bottom in the water body and flows into the water drainage weir to preferentially flow through the voids at the bottom of the water diversion guide wall and then flow over the weir top to be drained out of a water storage body; therefore, the composite weir can improve the capability of draining the density current at the bottom and the water environment in the water storage body while not changing the water drainage capability of the weir.

Description

technical field [0001] The invention relates to a building in the technical field of water conservancy engineering, in particular to a composite weir for rejecting foreign matter and heavy flow. Background technique [0002] From a hydraulic point of view, any hydraulic structure (or barrier) in the gravity flow with a free surface can be called a "weir" as long as it can play the role of backwater and overflow. [0003] From a natural point of view, hyperpycnal flow is two kinds of fluids with little difference in density and can be mixed. When the conditions are suitable, the relative movement occurs due to the difference in density. Global mixing occurs due to turbulence and other turbulent effects. In lakes or reservoirs, because the density of water carrying sediment is higher than that of clear water, when the conditions are right, it will move forward in the form of "muddy water hyperpycnal flow" at the bottom of the water. [0004] At present, some domestic water b...

AI Technical Summary

Problems solved by technology

[0004] At present, some domestic water bodies such as lakes and reservoirs often use weirs as their drainage structures. This structure can control the water level in the water storage body. The muddy water at the bottom stays in the water storage body

The main disadvantage of this technical invention is that although the water level can be adjusted to ensure a large displacement, in the drainage process, a large amount of clear water in the upper layer of the water storage body is completely discharged out of the weir, while the lower layer with higher sand concentration The muddy water cannot be effectively discharged, and the ability to "accumulate clear water and discharge muddy water" is poor

The main disadvantage of this technical invention is that: on the basis of the original weir structure, it is necessary to add a sand discharge pipeline across the crest of the weir, which undoubtedly increases the amount of engineering implementation of the drainage weir and increases the construction cost of the drainage system. and cannot directly control the water level in the reservoir

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