Method for identifying sudden drought based on instantaneous development rate

Abstract

The invention discloses a method for identifying sudden drought based on instantaneous development rate, which comprises the following steps: (1) constructing a standardized evaporation deficit indexbased on atmospheric evaporation requirements and actual evaporation data; (2) preliminarily identifying drought events connected on a space-time scale by using a three-dimensional clustering method;(3) defining drought development and recovery stages based on drought severity changes; (4) defining and calculating an instantaneous development and recovery rate between spatially connected and temporally adjacent drought blocks, and identifying sudden drought based on the instantaneous development and recovery rate; and (5) defining the characteristics of sudden drought intensity, severity, influence area, drought center and the like. The method provided by the invention has important guiding significance for identifying sudden drought, and can provide a certain degree of guidance for reducing agricultural loss caused by sudden drought.

Description

technical field [0001] The invention relates to the field of drought monitoring, in particular to a method for identifying sudden drought based on instantaneous development rate. Background technique [0002] Drought is one of the serious natural disasters, which has adverse effects on regional and global water resources, agriculture, and economic and social development. Traditional drought is generally considered to be a slow climate disaster triggered by a lack of precipitation for months or years in an area. However, under the background of climate warming, extreme temperatures often lead to abnormally frequent occurrence of evapotranspiration, which often leads to the rapid formation and development of drought in a short period of time, which is called sudden drought (hereinafter referred to as "sudden drought"). Because of the difficulty in tracking and forecasting sudden droughts, these new types of droughts often have huge adverse effects on agricultural production a...

AI Technical Summary

Problems solved by technology

However, the duration of sudden drought is relatively short, and the existing indexes used to identify and monitor meteorological, hydrological, and agricultural droughts are all based on months, which is difficult to work for

In addition, existing drought monitoring methods are suitable for slowly developing meteorological, hydrological, and agricultural droughts, but sudden droughts develop rapidly, and the instantaneous development rate should be considered, and existing drought monitoring methods are also difficult to monitor sudden droughts

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