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Prevention and control method for debris flow induced by ice-lake break and application of method

A mud-rock flow and dam technology, which is applied in the field of prevention and control of super-large mud-rock flow caused by glacial lake outburst, can solve the problems of no super-large mud-rock flow prevention and treatment method, low frequency of occurrence, and small distribution, so as to reduce the outbreak scale and weaken the The effect of peak flow rate and prolonged discharge time

Active Publication Date: 2016-12-21
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of debris flow is not distributed much and the frequency of occurrence is low, once it occurs, it will cause great harm
However, in the prior art, there is no prevention and treatment method for the sudden collapse of the glacial lake due to the melting of buried ice in the moraine dam body and the expansion of piping, ice landslides and ice avalanches into the lake.

Method used

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  • Prevention and control method for debris flow induced by ice-lake break and application of method
  • Prevention and control method for debris flow induced by ice-lake break and application of method
  • Prevention and control method for debris flow induced by ice-lake break and application of method

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Embodiment 1

[0033] Such as figure 1 , figure 2 shown. A basin located in a mountainous area at an altitude of 4500m has an area of ​​30km 2 , there is a moraine lake upstream, and its catchment area is about 20km 2 , through on-site investigation, it is found that the average height of moraine dam body 1 is 42m, the length of the dam crest axis is 80m, the average width B of moraine dam body 1 dam crest is 15m, and the length of the burst section is L 1 is 20m, and the storage capacity is about 300×10 when the ice lake is full of water 4 m 3 . In order to minimize the threat and harm to the railways, highways, water conservancy facilities, residential areas and farmland in the lower reaches of the ice lake, the ice lake outburst debris flow prevention method of the present invention is adopted, and the specific steps are as follows:

[0034] In the first step, starting from the center of the burst section on the moraine dam body 1, the calculation area is divided to both sides of t...

Embodiment 2

[0049] Such as image 3 , Figure 4 shown. A basin located in a mountainous area at an altitude of 4000m has an area of ​​70km 2 , there is a moraine lake upstream, and its catchment area is about 30km 2 , through on-site investigation, it is found that the average height of moraine dam body 1 is 60m, the length of the dam crest axis is 150m, the average width B of moraine dam body 1 dam crest is 12m, and the length of the burst section is L 1 is 40m, and the storage capacity is about 600×10 when the ice lake is full of water 4 m 3. In order to minimize the threat and harm to the railways, highways, water conservancy facilities, residential areas and farmland in the lower reaches of the ice lake, the ice lake outburst debris flow prevention method of the present invention is adopted, and the specific steps are as follows:

[0050] In the first step, starting from the center of the burst section on the moraine dam body 1, the calculation area is divided to both sides of t...

Embodiment 3

[0065] Such as Figure 5 , Figure 6 shown. A watershed area of ​​120km located in a mountainous area at an altitude of 5000m 2 , there is a moraine lake upstream, and its catchment area is about 70km 2 , through on-site investigation, it is found that the average height of moraine dam body 1 is 100m, the axis length of the dam crest is 260m, the average width B of the dam crest of moraine dam body 1 is 20m, and the length of the burst section is L 1 is 80m, and the storage capacity is about 1100×10 when the ice lake is full of water 4 m 3 . In order to minimize the threat and harm to the railways, highways, water conservancy facilities, residential areas and farmland in the lower reaches of the ice lake, the ice lake outburst debris flow prevention method of the present invention is adopted, and the specific steps are as follows:

[0066] In the first step, starting from the center of the burst section on the moraine dam body 1, the calculation area is divided to both s...

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Abstract

The invention discloses a prevention and control method for debris flow induced by ice-lake break and an application of the method. The method comprises the steps of determining a flood peak flow threshold of break flood debris flow in combination with topographic and geomorphic characteristic parameters of a drainage basin, rainfall characteristic parameters, inner-source characteristic parameters of the drainage basin, transport capacity of a main river and the like; then judging the stability of a morainic dam body in each calculation area and performing classification of dangerousness based on basic parameters obtained by field investigation, sampling and indoor testing of the morainic dam body; and based on this, determining body shape parameters and a distribution mode of pile structure bodies in the morainic dam body. According to the method and the application, for the situation that sudden ice-lake break caused by buried ice melting in the morainic dam, ice landslides and entry of ice into a lake due to icefall easily forms a giant debris flow disaster, the dam body undercutting speed can be effectively controlled, the break flood discharge time can be prolonged, the peak flow of break flood can be reduced, and the scale of forming the debris flow by the break flood can be reduced, regulated and controlled, so that the risk of causing harm to a downstream zone of the ice lake by the break flood is lowered.

Description

technical field [0001] The invention relates to a disaster prevention and mitigation technology for the flood process of a glacial lake outburst, in particular to a prevention and control method for a super large debris flow formed by a glacial lake outburst and its application. Background technique [0002] China's glacial lakes are mainly distributed in the Himalayas and Nyainqentanglha Mountains. The average altitude of this area is above 5000m. It is the area where glacial lakes develop and suffer the most serious damage from glacial lake outburst floods. Due to the strong activity of modern glaciers, the dam body at the outlet of the moraine lake at the end of the glacier suddenly collapsed, resulting in large-scale outburst floods, which strongly scoured and transported the loose accumulations of the gully bed and both sides of the bank along the way, making it gradually form ice. Lake burst debris flow. Although such mudslides are not distributed much, and the freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/26
CPCG06F30/20G06Q50/265Y02A10/40Y02A50/00
Inventor 陈剑刚游勇陈晓清赵万玉陈华勇胡凯王道正
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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