Calculation method of ice lake surge height and application thereof

Abstract

The invention discloses a calculation method of ice lake surge height, which belongs to the field of disaster prevention and control engineering and is characterized by comprising the following stepsof: a, distinguishing the attributes of glaciers according to the position of an ice collapse body; determining basic data of the ice-collapse body through investigation and surveying and mapping; b,determining parameters of height H of surges formed by ice collapse in the ice lake, wherein the parameters comprise elevation difference H0 between an ice collapse body and the surface of the ice lake, distance J between the ice collapse body and the tail end of the ice lake, width b of the tail end of the ice lake, area Ag of the ice lake, average water depth h of the ice lake and gradient P ofthe ground surface in front of the tail end of the ice lake; c, obtaining the height H of surges formed by ice collapse in the ice lake through calculation according to the formula VII. According to the method, a more accurate calculation method for the surge formed by the ice collapse in the ice lake is established, a basis is provided for judging whether the ice lake is burst or not, and the active disaster prevention applicability is greatly improved.

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 surge height of ice lakes and its application. 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 ...

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.

Images