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Composite weir for draining density current

A composite, density flow technology, applied in the construction field of hydraulic engineering technology, can solve the problems of increasing the construction cost of the drainage system, the muddy water staying in the water storage body, and the muddy water in the lower layer of sand concentration cannot be effectively discharged.

Inactive Publication Date: 2012-04-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Composite weir for draining density current
  • Composite weir for draining density current
  • Composite weir for draining density current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is located at the water outlet of the lake. In this embodiment, the drainage weir is a rectangular wall, and the vertical wall and the horizontal wall of the water-guiding wall in the corresponding composite weir for dispersing gravity flow are also rectangular. walls, such as figure 1 As shown, this embodiment includes: a water guiding wall 1, a drainage weir 2 and a guiding wall support 3, wherein: the water guiding wall 1 includes a horizontal wall 4 and an upright wall 5, and the top edge of the upright wall 5 is higher than the drainage weir 2, the guide wall support 3 is located at the bottom of the water guide wall 1 and is fixedly supported with the bottom bed of the water body, so that the water guide wall 1 can be suspended and the bottom edge is higher than the bottom bed of the water body.

[0024] The wall thickness of the described water diversion guide wall 1 is 15cm, the horizontal distance from the water-facing side edge of the horizonta...

Embodiment 2

[0029] This embodiment is located at the water outlet of the lake. In this embodiment, the drainage weir 2 is a hollow cylindrical wall body, and the corresponding vertical wall body 5 of the water guiding wall in the composite weir for discharging gravity flow is also a hollow circle. The cylindrical wall, the horizontal wall 4 is a circular wall, such as image 3 As shown, the repulsion and heavy flow composite type weir of this embodiment includes: a water guiding wall 1, a drainage weir 2 and a guiding wall support 3, wherein: the water guiding wall 1 includes a horizontal wall 4 and an upright wall 5, and the upright wall The top edge of 5 is higher than the top of the drainage weir 2, and the guide wall support 3 is located at the bottom of the water guide wall 1 and is fixedly supported with the bottom bed of the water body, so that the water guide wall 1 can be suspended and the bottom edge is higher than the bottom bed of the water body.

[0030] like image 3 As sho...

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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 exclusion and heavy flow. Background technique [0002] From a hydraulic point of view, any kind of hydraulic structure (or barrier) in the flow of gravity flow with free surface can be called "weir" as long as it can play the role of backwater and overflow. [0003] From a natural point of view, the hyperpycnal flow is the relative movement of two fluids with similar densities that can be mixed together. When the conditions are suitable, the relative motion occurs due to the difference in density. A global mixing phenomenon occurs due to turbulence and other turbulent effects. In lakes or reservoirs, the water flow carrying sediment, because its density is greater than that of clear water, moves forward in the form of "muddy water gravitational flow" at the bottom of the water when the conditions are suitable. [0004] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B7/18
Inventor 李艳红竺奇乐喻国良
Owner SHANGHAI JIAOTONG UNIV