A Calculation Method of Surge Height in Glacial Lake

Abstract

The invention discloses a method for calculating the surge height of a glacial lake, which belongs to the field of disaster prevention and control engineering, and is characterized in that it comprises the following steps: a. Distinguishing the attributes of glaciers through the position of the ice avalanche body; determining the ice avalanche body through surveying and mapping b. Determine the parameters of the surge height H formed by the ice avalanche in the ice lake, including the elevation difference H between the ice avalanche body and the surface of the ice lake 0 , the distance J between the glacier body and the end of the glacier lake, the width b of the glacier lake end, the area Ag of the glacier lake, the average water depth h of the glacier lake, and the surface slope P in front of the glacier lake end; c, the surge wave formed by the glacier avalanche The height H is calculated by formula 7. The invention establishes a more accurate calculation method for surge waves formed by ice avalanches in ice lakes, provides a basis for judging whether ice lakes collapse, and greatly improves the applicability of active disaster prevention.

Description

technical field [0001] The invention relates to the technical field of disaster prevention and control engineering in alpine mountainous areas, in particular to a method for calculating the height of swell waves in ice lakes. Background technique [0002] Ice avalanches are a natural phenomenon that occurs in alpine mountainous areas, and there are often glacial lakes downstream of ice avalanches. After the ice avalanche occurs, the ice blocks move into the glacial lake, often forming huge swells, raising the water level of the glacial lake, triggering the collapse of the glacial lake, forming a glacial lake outburst debris flow, and then rushing into the downstream river, blocking the river, and then collapsing, forming secondary disaster chain. Therefore, ice avalanches may not only harm the range below the nearby hillsides, but may also affect the upstream and downstream of the river. [0003] Ice avalanches often occur due to the tension cracks at the upper edge of the...

AI Technical Summary

Problems solved by technology

[0006] 2. The influence of sliding angle is not considered in the calculation of swell height

[0008] 4. The ice avalanche may fall vertically into the ice lake above the ice lake, but landslides and avalanches rarely have this phenomenon, and even if they do, their volume is often small

[0009] 5. The attenuation calculation during the propagation of the landslide is short at the beginning of the propagation. When the ratio of the movement distance to the water depth of the ice lake is less than 1, there will be a very large error, even infinite. For example, at the beginning, the movement distance is approximately equal to When 0, the calculation method is flawed

However, since the surge waves formed by ice avalanches in the ice lake cannot be calculated, it is impossible to fundamentally judge whether the ice lake has collapsed, and corresponding evidence cannot be provided, resulting in poor active disaster prevention.

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