Flood forecasting method based on double comparison algorithm

Abstract

The invention discloses a flood forecasting method based on a double comparison algorithm. The method includes: step 1, calculating a current flow amount value of a target small-basin; step 2, calculating a flow amount value of an upper reach in a foreseen period according to actually-measured lattice point rainfall data; step 3, comparing the current flow amount value of the target small-basin with the flow amount value in the foreseen period; and step 4, issuing early-warning information through a flood prevention forecasting system when the flow amount value in the foreseen period exceeds double of the current flow amount value of the target small-basin. Problems that according to mountain flood disaster early-warning of the prior art, current rain amounts are monitored according to rain amount stations, and are compared with critical rain amounts to determine whether early-warning information is issued; and rain falling on upper reaches of many small basins is light-to-moderate rain, generated rain amount and flow amount changes are not sufficient for triggering alarming of flood early-warning systems, and thus when instantaneous flow amounts are suddenly increased to more thandouble, mountain flood sudden-occurrence is caused, and non-timely prevention of tourists in river channels causes casualties and the like are solved.

Description

technical field [0001] The invention belongs to flood forecasting technology, in particular to a flood forecasting method based on a multiple ratio algorithm. Background technique: [0002] Flash floods occur frequently in mountainous areas. my country's hilly area accounts for more than 2 / 3 of the country's land area, and there are three steps from west to east. In the slope areas where the steps transition and the large mountain systems and their fringes, the height difference between the mountains and valleys is more than 2,000 meters. From 30° to 50°, the slope of the river bed is steep, and there are many falling water and waterfalls, which are easy to cause mountain torrent disasters. [0003] Mountain torrent disasters are the main cause of death caused by flood disasters in my country: in the 1990s, 1,900 to 3,700 people died of mountain torrent disasters nationwide each year, accounting for about 62% to 69% of the death toll in flood disasters; The average annual de...

AI Technical Summary

Problems solved by technology

[0006] The current situation is that many small watersheds experienced light to moderate rain in the upper reaches, and the resulting rainfall and flow changes were not enough to trigger the alarm of the flood warning system, so it did not arouse the vigilance of the middle and lower reaches