Mudslide disaster situation assessment method and application

Abstract

The invention discloses a mudslide disaster situation assessment method and application. The mudslide disaster situation assessment method comprises the steps of performing extraction and analysis of a mudslide accumulation area depositing thickness and particle size information of large-particle stones based on aerial photography data of an unmanned aerial vehicle, applying the data to the analysis of the material power process along the way, inverting mudslide dynamic parameters along the way, and performing quantitative analysis on the damage degree of a post-disaster mudslide accumulation area along the way, so as to achieve quick assessment of the disaster situation. The method can perform dynamics inversion on the whole spatial rang of a specific measurement area based on outdoor actual condition measurement data, perform regional quantitative analysis on the damage degree of the post-disaster mudslide accumulation area along the way, and serve post-disaster rescue and post-disaster reconstruction design.

Description

technical field [0001] The invention relates to a rapid evaluation method of debris flow disaster situation based on extraction of debris flow accumulation surface characteristic parameters and dynamic inversion, and its application in reconstruction and post-disaster rescue of debris flow. Background technique [0002] At present, the method usually used for disaster assessment in debris flow accumulation areas is to use numerical simulation to invert the movement process and dynamic parameters of debris flows, and then carry out risk assessment. The research and construction of the debris flow dynamics model is the basis of the dynamic process simulation, which describes the stress-strain relationship, fluid flow behavior and rheological characteristics of the debris flow medium. At present, there are still some defects in the numerical simulation research of the model, mainly including: (1) the imperfection and applicability of the existing debris flow dynamics model; (2)...

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Problems solved by technology

At present, there are still some defects in the numerical simulation research of the model, mainly including: (1) the imperfection and applicability of the existing debris flow dynamics model; (2) the influence of the complex environment (terrain, hydrology, etc.) Less, such as the stress distribution of debris flow in complex environments, quantitative analysis of kinetic energy transfer, etc.

Numerical simulation is only a computer simulation, and a series of idealized simplifications and assumptions are made for complex conditions. There is a clear gap with the actual situation in the field. The simulation results are not realistic and comprehensive enough to reflect the reality.

[0003] Another common method of debris flow disaster assessment is based on field survey data. However, since field surveys can only determine the local conditions of single or multiple points and sections, it is impossible to analyze and invert the disaster process from a large spatial scale. It is difficult to carry out timely field surveys for disasters in remote and traffic-interrupted disaster areas, often resulting in the lack of emergency disaster relief and disaster reduction information, inaccurate decision-making, and difficulty in carrying out substantive work in a timely manner

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