Mountainous area small watershed mountain torrent disaster divisional early warning method

Abstract

The invention provides a mountainous area small watershed mountain torrent disaster divisional early warning method. The method includes the following steps that: mountainous area small watersheds requiring mountain torrent disaster early warning are selected as target river sections, and river sections of which the banks require life and property protection are selected from the target river sections so as to be adopted as river sections to be subjected to early warning; 2, field investigation is conducted for past mountain flood disasters in the river sections to be subjected to early warning, disaster stricken regions where mountain torrent disasters are mainly manifested as washing-out, burying and submersion are marked as washing-out, burying and submersion disaster stricken regions;3, torrent disaster early warning indexes are established for the washing-out, burying and submersion disaster stricken regions respectively; and 4, the gradients of the bed of the river section of the burying disaster stricken region and the bed of the river section of an upstream river section connected with the burying disaster stricken region are measured before months in which rainstorms appear frequently, and early warnings of different levels are emitted according to the ratio of the gradients of the beds of the two river sections, and when there is a rainstorm in the target river section, the early warning indexes of the washing-out disaster stricken region and submersion disaster stricken region are monitored, and an early warning is emitted when the indexes of the washing-out disaster stricken region and submersion disaster stricken region reach the early warning indexes.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of torrential rain and mountain torrents, relates to a method for early warning of mountain torrent disasters in small watersheds in mountainous areas, and is suitable for early warning of torrential rains and torrents in small watersheds in mountainous areas. 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. my country's current mountain torrent disaster prevention and control technology research is still in its infancy. The establishment of mountain torrent disaster early warning indicators is conducive to assisting in judging the possible danger and occurrence time of mountain torrents before the occurrence of mountain torrents, and to maximize the protection of people's li...

AI Technical Summary

Problems solved by technology

The current water level early warning or the rainfall early warning calculated by "water level-flow-rainfall" has not fully considered the characteristics of the disaster-prone areas of heavy rain and mountain torrents and their different key disaster-causing factors, and there are significant differences in the early warning indicators of different types of torrent disasters , which has resulted in the existing single water level early warning or the rainfall early warning method derived from "water level-flow-rainfall" can only play an effective role in mountain torrent early warning for some local areas of small watersheds in mountainous areas, but it is difficult to obtain for other local areas. Good early warning effect, very prone to false alarms and missed alarms, the overall accuracy of mountain torrent disaster early warning needs to be improved

Images