Method for establishing and analyzing drought index based on gravity satellite

Abstract

The invention discloses a method for establishing and analyzing a drought index based on a gravity satellite. The method for establishing and analyzing the drought index based on the gravity satellite comprises the steps of preprocessing of observation data of the gravity satellite, extraction of the changing process of average total land water of an area, calculation of the spatial distribution of the total land water of the area, standardization processing of the total land water of the area, and calculation and analysis of the time sequence and spatial distribution of total water abnormal indexes of the drought index based on the gravity satellite. According to the method for establishing and analyzing the drought index based on the gravity satellite, the drought index established with the method can effectively reflect the seasonal and interannual changing rule of the total land water and scientifically disclose disaster causing process of a drought; a disaster-inducing mechanism of the duration of the drought is considered, the influence mechanism of the serious drought at the earlier stage on the disastrous situation at the later stage can be reflected effectively, and the problem of the scientific bottleneck of monitoring and evaluation of the drought in an area where data are insufficient or unavailable is solved.

Description

technical field [0001] The present invention relates to a method for constructing and analyzing drought index based on gravity satellite, in particular to a method for constructing a drought index that can reflect the impact of drought over time based on total land water retrieved from GRCAE gravity satellite data, belonging to gravity field observation and hydrology Study combined interdisciplinary technical fields. Background technique [0002] Drought is one of the major natural disasters that affect the sustainable development of society and economy in the world. It has the characteristics of long duration, wide range of influence, and multiple areas of influence. There is no unified standard for the definition and intensity classification of drought. Different drought indicators have their own advantages, disadvantages and applicability due to their construction purposes, hydrological input data and calculation methods. [0003] E.g: [0004] (1) The Standard Precipit...

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Problems solved by technology

[0006] (3) The Hydrological Drought Index (HDI) uses surface runoff, reservoirs, and river water levels to construct drought indicators. Due to the lack of measured data such as water content of watershed soil and groundwater depth, it cannot represent the overall situation of the region well.

However, the drought index based on GRACE terrestrial water resources storage has not been reported at home and abroad

Therefore, there is a lack of a scientific and reasonable quantitative index to realize large-scale and long-term real-time monitoring and analysis of water resources and drought.

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