Setting method of high-sand-content river dam body sand discharging holes

A sand discharge hole and river technology, which is applied to the setting of sand discharge holes in the dam body of high-sediment rivers, can solve the problems of threatening the safety of the dam, the increase of the opening and closing force of the gate, and the damage of the gate or the opening and closing facilities, so as to save The effect of engineering investment

Active Publication Date: 2019-06-21
YELLOW RIVER ENG CONSULTING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The silt at the entrance of the discharge structure reaches a certain height, and the silt will increase the opening and closing force of the gate, which will easily cause damage to the gate or the

Method used

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  • Setting method of high-sand-content river dam body sand discharging holes
  • Setting method of high-sand-content river dam body sand discharging holes
  • Setting method of high-sand-content river dam body sand discharging holes

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Embodiment 1

[0047] Taking the upper dam of the high-sediment river of Jinghe River as the research object, the methods of setting sand discharge holes on the dam body include:

[0048] (1) Obtain the elevation A of the low sand discharge hole

[0049] According to the formula

[0050] Get H z , where μ is the flow coefficient 0.78; A k The cross-sectional area of ​​the channel at the outlet of the low-level sand discharge is 143m 2 (the channel cross-section at the outlet of the low-level silt discharge hole is a rectangle, and the width of the rectangle is 5.5m, and the height is 6.5m to set the number of holes as 4 holes); the Q is the flood peak of this sandy river once in 5 years Flow 3300m 3 ;

[0051] The effective water head Hz at the center of the low-level sand discharge orifice is 44.75m when the flow is free;

[0052] According to A=H 死水位 -H z -h / 2 (Formula I)

[0053] Calculate the elevation of the low-level sand discharge hole; among them, H 死水位 is 756m; h is the ...

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Abstract

The invention provides a setting method of high-sand-content river dam body sand discharging holes, and belongs to the technical field of hydro-junction engineering protection. The sand discharging holes comprise high-position sand discharging holes and low-position sand discharging holes, the elevation of the high-position sand discharging holes and the elevation of the low-position sand discharging holes are limited, before the flood season, the high-position sand discharging holes are used for reducing the elevation of the desilting surface in front of a dam, and during the flood season, the low-position sand discharging holes are used for effectively flushing a reservoir area, rapidly reducing the desilting elevation in front of the dam, and increasing the effective reservoir capacity;the dam body is provided with the low-position sand discharging holes, and if rich water years come, the low-position sand discharging holes are opened, so that the low-water-level sand discharging capacity of the reservoir can be improved, the silted tank storage capacity can be recovered, and part of the sand blocking storage capacity can be reused.

Description

technical field [0001] The invention relates to the technical field of water conservancy project protection, in particular to a method for setting sand discharge holes in a dam body of a river with high sand content. Background technique [0002] In high-sediment rivers, the current has a high sediment concentration and a large amount of incoming sediment, with an average sediment concentration of 100kg / m 3 As mentioned above, the reservoir sediment problem is very complicated. Considering the sediment deposition during the operation of the reservoir, such reservoirs generally have a sediment storage capacity. Reservoir operation is divided into sand retention period and normal operation period. During the sand-blocking period, most of the incoming sand from the upstream of the reservoir will be silted in the reservoir, and a small part of the incoming sand will be discharged to the downstream channel with the discharge of the flood. After the sediment storage capacity is ...

Claims

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Application Information

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IPC IPC(8): E02B8/02
Inventor 张金良
Owner YELLOW RIVER ENG CONSULTING
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