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Method for improving flow state of tributary entrance water diversion hub of tidal river reach

A technology for river sections and tributaries, which is applied in the field of improving the flow state of the estuary of the tidal river estuary, can solve the problems of weakened overall discharge capacity, no clear calculation method, and inconspicuous improvement effect, so as to save material costs and reduce Experimental group times, the effect of improving the bad flow state

Active Publication Date: 2017-09-26
NANJING HYDRAULIC RES INST
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Problems solved by technology

In addition, the water flows down the side bank of the pumping station and enters the control gate in front of the pumping station. There is an oblique flow at the head of the partition wall, so that the control gate is in the backflow area near the gate hole on the side of the pumping station, and the overall discharge capacity is weakened. The traditional rectification The pier arrangement has no obvious effect on improving the flow pattern
[0004] At present, for the water diversion hub of the tributary of the tidal river section, how to determine the angle between the diversion river and the tidal main channel, so as to ensure the diversion and the stability of the river regime, there is no clear calculation method; at the same time, how to accurately arrange the rectifying piers, so that To improve the bad flow state and improve the flow capacity, there is also a lack of a complete set of design methods

Method used

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  • Method for improving flow state of tributary entrance water diversion hub of tidal river reach
  • Method for improving flow state of tributary entrance water diversion hub of tidal river reach
  • Method for improving flow state of tributary entrance water diversion hub of tidal river reach

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Embodiment 2

[0047] In this embodiment, the angle between the newly opened diversion river and the main channel is corrected according to the angle between the natural tributaries of the main channel near the main channel and the main channel; the specific method is as follows:

[0048] Measure the angle β between the natural tributary and the main channel, and the time T of high tide at the natural tributary g and ebb duration T h ;Use the corrected formula as:

[0049]

[0050] There is a natural tributary Xiaojiajiang about 600m downstream of the Jiepai water conservancy project of the extension and dredging project of the Xinmeng River. The angle between the Xiaojiajiang and the main river is measured to be β = 53.4°. is 8.35h, then the angle between the approach river and the main channel after correction is θ=56.3°. The revised included angle design is more in line with the natural evolution characteristics of water flow, and at the same time, it also takes into account the stab...

Embodiment 3

[0052] like Figure 2-3 As shown, in this embodiment, parameters such as the structure and position of the rectifying pier are calculated according to the water flow conditions and oblique flow angles observed in the model test.

[0053] In the model test, it was found that when the Waijiang Ebb Tide Hub opened the gate to divert water, the water flow directly rushed to the side wall of the pumping station and flowed down. The shielded area creates vortices and backflows. Observe the unfavorable flow state, measure the angle between the water flow line and the channel center line, and define it as the oblique flow deviation angle. Under this working condition, the oblique flow deviation angle is α=40°.

[0054] The distance between the rectifying piers 84-86, the horizontal distance between the rectifying piers 86 and the partition wall 83 is d, d=1 / 3H, H is the total rectification width; H=1 / 3D, D is the 81 gates of the control gate The total width; the length L of rectifyi...

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Abstract

The invention relates to a method for improving a flow state of a tributary entrance water diversion hub of a tidal river reach. Hydrologic data of the tidal river reach is collected, an included angle between a main channel of the tidal river reach and an intake channel is designed according to actual water flow conditions of the reach, water flow conditions of a newly-built river are analyzed, and assistant rectification is performed by utilizing rectification piers and a flow isolating wall according to the actual water flow conditions. A river channel trend designed according to the flow state improvement method can make water flow entering the intake channel smoother; meanwhile, bank slope washing out by the water flow is also reduced, a river regime is more stable, and the method is of great significance for long-term stable implementation of a hub function. Meanwhile, the rectification piers and the flow isolating wall are adopted for assistant adjustment, so a regulating sluice entrance flow state can be improved, and the hub flow capacity is improved.

Description

technical field [0001] The invention relates to the field of water conservancy engineering, in particular to a method for improving the flow state of a water diversion hub at a tidal river estuary. Background technique [0002] The uneven distribution of water resources and the deterioration of water quality have led to serious water problems, making it urgent to implement cross-basin water transfer projects. In the cross-basin water diversion project, the water level and flow velocity of the tidal river section changes in real time, and the ebb and flow of the tide is asymmetrical. Especially when the hub is close to the main river channel under the condition of limited land use, the water flow in the diversion gate area is affected by the ebb and flow of the main river channel. Containment effect, water flow problem is complicated. [0003] In the case of ebb tide diversion, the water flows down the main river channel, and is divided into two streams at the embankment on ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 陆永军莫思平李寿千朱昊朱明成陆彦刘怀湘王志力左利钦侯庆志
Owner NANJING HYDRAULIC RES INST
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