Mountain torrent and debris flow early warning method and system based on steep slope confluence and section flow calculation

Abstract

The present invention provides a method for early warning of torrent and debris flow based on steep slope confluence and cross-section flow calculation, comprising steps: 1. By processing the high-precision DEM terrain data and remote sensing data of the single ditch of the debris flow and its watershed, each grid unit is obtained 2. According to the actual geological conditions of different debris flow ditches, combined with continuous long-duration rainfall data, the rainwater infiltration of each grid unit is obtained; 3. Using the calculation method based on steep slope confluence, calculate the debris flow ditches and The surface confluence of the watershed where it is located; 4. Early warning through the submerged range of mountain torrents and debris flows corresponding to the rainfall in different time periods. A flash flood and mudslide early warning system is also provided. The invention is applied to the early warning of mountain torrents and valley-type mud-rock flows, and has an obvious effect of improving the early warning efficiency for the early formation of mountain torrent mud-rock flows early warning results. It has great practical significance for ensuring personnel safety, emergency avoidance, and reducing the loss of people's lives and property.

Description

technical field [0001] The invention relates to the technical field of disaster early warning, in particular to a mountain torrent and debris flow early warning method and system based on steep slope confluence and section flow calculation. Background technique [0002] Debris flow is the sudden geological disaster that causes the most casualties in Beijing. Since 1949, the number of deaths caused by various sudden geological disasters in Beijing has exceeded 600, and the direct economic loss has reached hundreds of millions of yuan. More than 500 people. Valley-type debris flows are most widely distributed in Beijing, and their formation can be roughly divided into three stages: meteorological inducements (mainly rainfall), formation of floods or slope debris flows, and formation of valley debris flows. It takes a period of time from the accumulation of rainfall and soil saturation in the first stage to the formation of debris flow disasters in the third stage. During this...

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Problems solved by technology

However, this method is also unreasonable. Although the formation of torrents and debris flows is mainly triggered by rainfall, the accumulated rainfall, real-time rainfall and rainfall intensity in the previous period are all important triggering factors. The geological conditions and vegetation conditions of different valleys are different. Accumulated rainfall has an impact on soil saturation and stability, and short-term rainfall intensity is also crucial to the initiation of disasters. The accuracy of simply using the critical rainfall value as an early warning indicator is open to question

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