Transient excitation discharge method for barrier lake

A technology of transient excitation and discharge trough, applied in barrage/weir, water conservancy projects, sea area engineering, etc., can solve the problems of small initial flow and large peak flow, so as to reduce peak flow, reduce flood control pressure, and ensure safety Effect

Inactive Publication Date: 2019-05-31
SICHUAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] Aiming at the disadvantages of the traditional dammed lake open canal discharge that the initial flow rate is small and the peak flow rate is large, the present invention aims to provide a method for dammed lake transient excitation discharge

Method used

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  • Transient excitation discharge method for barrier lake
  • Transient excitation discharge method for barrier lake
  • Transient excitation discharge method for barrier lake

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Embodiment

[0032] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] This method is firstly applied to the design of an emergency rescue channel for a barrier lake, and the steps are as follows:

[0034] (1) According to the topographic and geological conditions of the barrier dam, determine the center line of the discharge channel. The depth of the discharge channel is 8m, the bottom width is 5m, the side slopes on both sides are 1:1.5, and the bottom elevation at the entrance is H 0 =1214.0m.

[0035] (2) Design temporary small cofferdam water retaining height Δh 1 =2.0m, here the barrier lake is a mountain barrier lake, take the safe heightening Δh 2 = 1.0m, temporary small cofferdam crest elevation H = H 0 +Δh 1 +Δh 2 =1214.0+2.0+1.0=1217.0m.

[0036] (3) Design retaining height of temporary small cofferdam Δh 1 = 2.0m, allowable hydraulic gradient of earth and rock mass i = 0.3, width of temp...

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Abstract

The invention discloses a transient excitation discharge method for a barrier lake. The defects that the initial flow is small and the peak flow is large during channeling and discharge of a traditional barrier lake are overcome. According to the crest elevation H, width W and length L of a small temporary cofferdam, the range of the small temporary cofferdam is determined when an entrance area ofa discharge groove is designed. By forming the small temporary water-stopping cofferdam at an accumulation body of the upstream part of a reserved cofferdam dam, a certain square amount of earthworkis reserved and not excavated, the small temporary cofferdam at the entrance area of the discharge groove serves as a water stopping structure, thus it can be guaranteed that lake water cannot overflow in the construction period, and the safety of construction personnel and equipment is guaranteed. By means of the transient excitation discharge method, the excitation effect of a water head stoppedby the small temporary cofferdam is utilized, full play is given to the natural force of hydraulic scouring, so that the discharge groove is quickly scoured, widened and deepened in the discharge process, and the excavation workload of the discharge groove can be reduced.

Description

technical field [0001] The invention belongs to the technical field of discharge disposal of dammed lakes, and in particular relates to a transient excitation discharge method of dammed lakes. Background technique [0002] Barrier lakes are lakes formed by water storage after landslides and landslides block natural river channels caused by volcanic lava flows, ice water deposits, or mountain rocks collapsed by seismic activities. The dam structure of the barrier dam that blocks the river is loose, its composition is uneven, and its overall stability is poor. It is easy to collapse due to instability, flooding and other reasons, causing secondary disasters such as debris flow and flooding downstream, causing serious life in the downstream. and property damage. Therefore, for large-scale barrier lakes with serious potential threats, in order to reduce the risk of barrier lake collapse, reduce the damage of barrier lake discharge to the upstream and downstream. It is necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B8/06
Inventor 杨晓宇杨兴国徐昊周家文戚顺超范刚
Owner SICHUAN UNIV
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