A Flash Flood Early Warning Method Considering the Spatial Heterogeneity of Rainfall

Abstract

The invention discloses a mountain torrent early warning method considering the spatial heterogeneity of rainfall, which belongs to the field of hydrological forecasting. The method includes: acquiring soil saturation and composite rainfall within a set time period before the occurrence of multiple historical flood peaks in the watershed to be early warning; wherein , the combined rainfall takes into account both the amount of rainfall and the spatial distribution of rainfall; construct a mountain torrent early warning model based on the above soil saturation and compound rainfall; collect the soil saturation of the watershed to be warned, and obtain the critical composite rainfall index corresponding to the current soil saturation according to the mountain torrent early warning model, By comparing the current composite rainfall and the critical composite rainfall index in the basin to be warned, it is judged whether the flood caused by rainfall is a super-warning flood. The method of the invention can specifically quantify the unevenness of the spatial distribution of rainfall and the distribution of the center of the rainstorm, and the calculated critical composite rainfall index not only considers the size of the rainfall, but also considers the spatial distribution of the rainfall, thereby improving the accuracy of mountain torrent warning.

Description

technical field [0001] The invention belongs to the technical field of hydrological forecasting, and more specifically relates to a flash flood early warning method considering the spatial heterogeneity of rainfall. Background technique [0002] Affected by global warming, the frequency of local heavy rainfall in hilly areas is increasing. With the intensification of human activities in hilly areas, mountain torrent disasters have gradually become the shortcoming of flood control and disaster reduction in my country. To this end, my country has carried out a nationwide survey and evaluation of mountain torrent disasters from 2010 to 2016, and has made considerable progress in the key technologies of mountain torrent disaster prevention, such as mountain torrent disaster risk zoning, forecasting and early warning, and initially established a mountain torrent disaster prevention system. However, on the one hand, my country’s mountain torrent disaster prevention and control is ...

AI Technical Summary

Problems solved by technology

Although these indicators can reflect the spatial differences of rainfall, they cannot reflect the distribution of rainstorm centers. The information contained in the indicators is not comprehensive enough to directly calculate the critical rainfall, which will affect the accuracy of flash flood warnings.

Images