Barrier dam outburst risk grading and early warning method based on different outburst modes

A dangerous and model technology, applied in the field of basic research on disaster prevention and mitigation, and risk control theory, it can solve problems such as single, difficult to accurately reflect the disaster process, and different failure modes to study the dam failure process.

Active Publication Date: 2022-03-01
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing technologies, a single method and a small number of parameters are generally used to predict, so as to establish a statistical model, which is difficult to accurately reflect the process of disasters
Most of the previous studies did not study the dam failure process for different failure modes, but only focused on the peak discharge of the failure flood and other failure parameters, ignoring the physical process before the failure

Method used

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  • Barrier dam outburst risk grading and early warning method based on different outburst modes
  • Barrier dam outburst risk grading and early warning method based on different outburst modes
  • Barrier dam outburst risk grading and early warning method based on different outburst modes

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Experimental program
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Effect test

Embodiment 1

[0058] refer to Figure 1 to Figure 5 , based on different failure modes of barrier dam failure risk classification and early warning method, including the following steps:

[0059] S101: Obtain parameters: obtain the initial breach top width, bottom width, height, breach slope angle, initial water surface elevation, initial breach bottom elevation, initial storage capacity, median particle size, and channel or channel slope parameters of the barrier dam;

[0060] S102: Discrimination of the failure mode of the barrier dam: use the discriminant formula of the failure mode of the barrier dam to determine the failure mode of the barrier dam;

[0061] S103: Establish a mathematical model for the failure of the barrier dam: based on the different failure modes, reacquire the basic parameters of the barrier dam, and establish a mathematical model for the failure of the barrier dam under different failure modes;

[0062] S104: Calculating the failure parameters: based on the mathem...

Embodiment 2

[0102] refer to Figure 1 to Figure 5 , the risk classification and early warning method of barrier dam failure, such as figure 1 shown, including the following steps:

[0103] S101: Determine the initial dam body height H, dam body length B, dam crest width Wt, upstream slope angle α, backwater slope slope β, critical water level Dcr, diameter d 50 , porosity n, and channel or channel slope θ, etc.

[0104] S102: Discrimination of the failure mode of the barrier dam.

[0105] Dimensionless water level Dcr / H of barrier dam according to formula 1-3:

[0106]

[0107] where k 1 =0.4007,k 2 =-1.7442,k 3 =-2.6785,k 4 =-2.9792×10 -9 , k 5= 3.55589,k 6 =0.1029,k 7 =-0.0663,k 8 =80.8072,k 9 =-211.7417. Formula 1;

[0108]

[0109] where l 1 =0.2456, l 2 =-0.8568, l 3 =7.7789, l 4 =0.0013,l 5 =2.0493, l 6 =0.5359, l 7 =0.0741, l 8 =-0.0447, l 9 = 1.3995. Formula 2;

[0110]

[0111] where m 1 =-3.4944, m 2 =5.0656, m 3 =0.0009, m 4 =772454.1004,...

Embodiment 3

[0145] Analysis of Tangjiashan barrier dam failure risk grade:

[0146] After the Wenchuan earthquake, a large number of landslides and collapses occurred in the earthquake area, which led to the appearance of a large number of barrier lakes, among which the Tangjiashan barrier lake is the most dangerous. Before the earthquake, the slopes on both sides of Tangjiashan were about 40°. From the structural point of view, they belonged to the slopes with medium and steep dip angles. The earthquake caused the slope on one side to become unstable, forming a high-speed landslide. Block the Tongkou River, forming a volume of 20.37 million m 3 The barrier dam is very likely to collapse and cause disasters downstream. The barrier dam is located in the alpine valley area, the terrain is high in the northwest and low in the southeast, with an altitude of 1500-2389m and a relative height difference of 400-1000m. There are differences in the slopes on both sides of the river. The bedrock o...

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Abstract

The invention discloses a barrier dam outburst risk grading and early warning method based on different outburst modes. According to the technical scheme, the method is characterized by comprising the steps that S101, parameters are obtained, wherein the initial breach top width, the bottom width, the height, the breach slope angle, the initial water surface elevation, the initial breach bottom elevation, the initial reservoir capacity, the median particle size and river channel or channel slope parameters of the barrier dam are obtained; s102, judging the breakout mode of the barrier dam: judging the breakout mode of the barrier dam by utilizing the discriminant of the breakout mode of the barrier dam; s103, establishing a barrier dam outburst mathematical model; s104, calculating each outburst parameter; and S105, risk grading and early warning of barrier dam outburst based on different outburst modes: carrying out risk grading and early warning of barrier dam outburst on the basis of risk grading of barrier dam outburst. The barrier dam danger grading and early warning method has the advantage that the danger of damage of the barrier dam in different outburst modes can be graded and early warned.

Description

technical field [0001] The invention relates to the fields of risk control theory and basic research on disaster prevention and mitigation, and in particular to a dam failure risk classification and early warning method based on different failure modes. Background technique [0002] In recent years, a large number of disasters such as landslides and collapses have been caused by seismic activities and other reasons, resulting in frequent occurrence of barrier dam disasters. The flood disaster caused by the failure of the barrier dam seriously threatens the safety of human life and property. Therefore, it is necessary to conduct a scientific, reasonable and accurate assessment of the flood caused by the failure of the barrier dam. For the classification and early warning of the risk of the failure of the barrier dam, it is necessary to conduct a preliminary analysis and judgment on the failure mode of the barrier dam, and then adopt Mathematical methods for simulating the fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/10G08B31/00
CPCG08B21/10G08B31/00Y02A10/40
Inventor 蒋先刚程海光邱海军杨校辉徐文财
Owner SICHUAN AGRI UNIV
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