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Barrier lake dangerous classification and landslide-type debris flow and flash flood warning method

A debris flow, dangerous technology, used in alarms, climate sustainability, instruments, etc., can solve the problems of difficult to accurately reflect the disaster process, single and other problems

Active Publication Date: 2019-12-03
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 technology, a single method and a small number of parameters are generally used for detection, so as to establish a statistical model, which is difficult to accurately reflect the process of disasters
Most of the previous studies focused on the failure experiments of barrier dams under different conditions to study the dam failure process. They only focused on the peak discharge and flood evolution of the failure flood, and did not involve the conditions of debris flow and flash floods after the failure of the barrier dam.

Method used

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  • Barrier lake dangerous classification and landslide-type debris flow and flash flood warning method
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  • Barrier lake dangerous classification and landslide-type debris flow and flash flood warning method

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Effect test

Embodiment 1

[0040] Danger classification of barrier lakes and early warning methods for outburst debris flows and flash floods, such as figure 1 shown, including the following steps:

[0041] S101: Determine the top width of the initial breach of the barrier dam by means of on-site investigation, remote sensing, and hydrology B t0 , bottom width B b0 , height H 0 , breach slope angle α 0 , the initial water surface elevation H w0 , the initial elevation of the bottom of the breach Z 0 , initial water depth h 0 , initial storage capacity V 0 , median diameter d 50 And the slope J of the river course or ditch, etc.

[0042] S102: Early warning of barrier lake hazard classification, calculate the risk potential energy of the barrier lake, and use the risk potential energy classification as the index of barrier lake hazard classification.

[0043] alpha r The coefficient is calculated according to formula 1:

[0044]

[0045] where m r —coefficient, take 2.0,

[0046] V 0 — i...

Embodiment 2

[0108] Risk classification of Chayuangou dam and judgment of debris flow or flash flood after failure:

[0109] The Chayuangou barrier dam is a barrier dam formed after the 5.12 earthquake. Its scale is smaller than other barrier lakes formed in the earthquake. In the ditch, the debris flow ditch is a large low-frequency viscous ditch. The exposed strata in the Chayuangou watershed are composed of Triassic metamorphic sandstone, slate and phyllite. The rocks in the middle and lower reaches of the watershed are mainly phyllite; the upper reaches are mainly medium-grained plagiogranite. Due to the steep rocks on both sides of the valley, the rocks are weathered and broken, and there are a large number of collapsed rock piles of hundreds to thousands of cubic meters. The bottom of the ditch is mostly covered with slope alluvial gravel soil, with a thickness ranging from 1 to 3m, and a large amount of corundum and quartz sand mining wastes are piled up along both sides of the dit...

Embodiment 3

[0117] Judgment on formation of debris flow after Tangjiashan dam failure:

[0118] 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 3The 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. Th...

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Abstract

The invention relates to the technical field of risk control theory and basic research of disaster prevention and mitigation, and discloses a barrier lake dangerous classification and landslide-type debris flow and flash flood warning method, which solves the technical problem of barrier lake dangerous classification and can judge the formation conditions of debris flow and flash flood after the barrier lake collapses. The invention comprises the following steps: obtaining parameters first; then performing barrier lake dangerous classification and early warning; calculating a peak flow rate, and calculating critical conditions of the landslide-type debris flow; and then performing early warning on the landslide-type debris flow and flash flood dangerous case. During the landslide of the barrier lake, the maximum gravity of the mixed liquid is at the maximum peak flow rate; and if the debris flow cannot be formed in a river-way or a channel at the peak flow rate, the debris flow cannotbe formed during the entire landslide, so that a flash flood is determined; and if the debris flow can be formed in the river-way or the channel at the peak flow rate, it is determined that the debrisflow is formed.

Description

technical field [0001] The invention relates to the fields of risk control theory and basic research on disaster prevention and mitigation, and more specifically, relates to a hazard classification of barrier lakes and a method for early warning of burst type debris flow and mountain torrent danger. Background technique [0002] In recent years, a large number of disasters such as landslides and collapses have been caused by earthquakes and other reasons, resulting in the frequent appearance of barrier dams and barrier lakes. Flood disasters and debris flow disasters caused by barrier dams seriously threaten the safety of human life and property. Among them, the consequences of the burst debris flow caused by the failure of barrier dams are the most serious. Therefore, it is necessary to scientifically, rationally and accurately assess the debris flow and torrent formed after the barrier lake breaks, to classify the risk of the barrier lake, and to give early warning of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/10G08B21/18
CPCG08B21/10G08B21/182Y02A50/00
Inventor 蒋先刚陈鹏帅寇译文
Owner SICHUAN AGRI UNIV
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