A mountain area small watershed rainfall runoff response-based real-time accumulated rainfall rainstorm mountain flood early warning method

Abstract

The invention provides a real-time accumulated rainfall rainstorm mountain torrent early warning method based on mountainous area small watershed rainfall runoff response. The method comprises the following steps: (1) selecting a small watershed river reach of a mountainous area needing rainstorm mountain torrent early warning as a target river reach, and searching flood characteristic data of n-stage rainstorm mountain torrent of the target river reach and rainfall characteristic data of stage rainstorm corresponding to the n-stage rainstorm mountain torrent; Determining a flood abrupt rise time point of each field rainstorm mountain flood according to the flood characteristic data; (2) analyzing the n times of rainstorm mountain torrent; (3) determining a critical cumulative rainfall index for sending out rainstorm mountain torrent early warning; (4) 1, when rainstorm occurs at the upstream of the target river reach, collecting time period rainfall data of field rainstorm, and calculating accumulated rainfall from the beginning of rainfall to different time period rainfall data collection time points in real time; And 2, when the accumulated rainfall capacity in the step (1) reaches a critical accumulated rainfall capacity index for giving out rainstorm mountain torrent early warning, immediately giving out the rainstorm mountain torrent early warning.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of rainstorm and mountain torrent disasters, and relates to a real-time accumulated rainfall rainstorm and mountain torrent early warning method based on the response of rainfall and runoff in small watersheds in mountainous areas, and is suitable for early warning of torrential rain and torrents in small mountainous watersheds. Background technique [0002] Mountain torrent disasters refer to flood disasters caused by rainfall in hilly areas, as well as mudslides and landslides induced by mountain torrents, which cause losses to the national economy and people's lives and property. They are characterized by suddenness, concentrated water volume, and large destructive power. . The current early warning system for rainstorm and mountain torrent disasters in my country generally uses rainfall and water level as early warning indicators, and the determination of water level parameter...

AI Technical Summary

Problems solved by technology

For small mountainous watersheds, considering that there are often significant washouts and silting disasters in the process of heavy rain and mountain torrents in mountainous watersheds, it is difficult to obtain better early warning indicators through the inverse method of water level-flow-rainfall, and it is prone to missed alarms , False alarm phenomenon, the accuracy of mountain torrent warning needs to be improved

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