Overflow water level warning method for glacial lake outburst and application thereof

A water level and overflow technology, which is applied in the fields of alarms, climate change adaptation, instruments, etc., can solve the problems of low early warning accuracy, failure to consider whether the ice avalanche can reach the ice lake, poor applicability, etc., and achieve high early warning accuracy. , Improve the accuracy of early warning and enhance the effect of applicability

Active Publication Date: 2018-03-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The glacial lake outburst early warning method disclosed in this patent document studies the internal mechanism of the glacial lake outburst occurrence degree by studying temperature factors and topographical factors, and establishes a glacial lake outburst early warning and forecast model; however, this method only considers glacier collapse,

Method used

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  • Overflow water level warning method for glacial lake outburst and application thereof
  • Overflow water level warning method for glacial lake outburst and application thereof
  • Overflow water level warning method for glacial lake outburst and application thereof

Examples

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Example Embodiment

[0024] Example 1

[0025] A method for early warning of overflow water level of a glacier lake burst, comprising the following steps:

[0026] a. Investigate and measure the thickness T of the top of the ice track dam, the width of the breach b, and the average width of the ice lake w 0 , the length-to-width ratio c of the glacial lake, the average slope β of the bank slope of the glacial lake before the outburst, and the characteristic particle size of the starting sediment d;

[0027] b. Analyze the critical water level conditions of the sediment at the overflow outlet of the ice-mark embankment when the water level rises, and obtain the critical overflow water depth H of the glacier lake outburst;

[0028]

[0029] Among them, H is the critical overflow water depth of glacial lake burst, in m; d is the characteristic particle size of starting sediment, in m; T is the thickness of ice track embankment crest, in m; b is the burst width, in m; w 0 is the average width of ...

Example Embodiment

[0032] Example 2

[0033] A method for early warning of overflow water level of a glacier lake burst, comprising the following steps:

[0034] a. Investigate and measure the thickness T of the top of the ice track dam, the width of the breach b, and the average width of the ice lake w 0 , the length-to-width ratio c of the glacial lake, the average slope β of the bank slope of the glacial lake before the outburst, and the characteristic particle size of the starting sediment d;

[0035] b. Analyze the critical water level conditions of the sediment at the overflow outlet of the ice-mark embankment when the water level rises, and obtain the critical overflow water depth H of the glacier lake outburst;

[0036]

[0037] Among them, H is the critical overflow water depth of glacial lake burst, in m; d is the characteristic particle size of starting sediment, in m; T is the thickness of ice track embankment crest, in m; b is the burst width, in m; w 0 is the average width of th...

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Abstract

The invention discloses an overflow water level warning method for glacial lake outburst, which comprises the following steps: (a) the thickness T of the top of an ice trace dam, the width b of the outburst mouth, the average width w0 of a glacial lake, the length-to-width ratio c of the glacial lake, the average slope Beta of the shore slope of the glacial lake before outburst, and the characteristic particle size d of incipient sediment are surveyed; (b) the critical overflow water depth H of glacial lake outburst is calculated; and (c) the water level of the glacial lake above the overflowmouth rises suddenly for more than 30s, and when HCr<0.6H, there is very small probability that the glacial lake bursts; when 0.6H<=HCr<0.8H, there is small probability that the glacial lake bursts; when 0.8H<=HCr<H, there is medium probability that the glacial lake bursts; and when the HCr>=H, there is large probability that the glacial lake bursts. The method fully considers the factors influencing the critical overflow water depth of glacial lake outburst. The calculated result is more in line with the actual situation. The accuracy of warning is high. The method is of higher applicability.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to an overflow water level early warning method for a glacial lake outburst and its application. Background technique [0002] Glacial lake outburst is a natural phenomenon that occurs in the distribution area of ​​alpine glaciers. The main cause of glacial lake outbursts is the flooding type of ice-slides or ice avalanches into the lake. Ice landslides or ice avalanches into the lake cause the water level to rise and form an overflow. When the flow rate of the overflow water head is greater than the starting flow rate of the moraine and the rate of water level drop is lower than the rate of scouring downcut, it will lead to collapse. Therefore, the study of the critical hydrological conditions of the overflow-type outburst of the moraine lake is the basis for predicting the disaster of the outburst of the glacial lake. [0003] At present, domestic and forei...

Claims

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Application Information

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IPC IPC(8): G08B21/10G08B31/00
CPCG08B21/10G08B31/00Y02A50/00
Inventor 余斌刘清华范冬捷
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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