Vegetation drought monitoring and evaluating method

A drought and vegetation technology, applied in instruments, climate change adaptation, data processing applications, etc., can solve the problems of uncertainty in drought assessment and inability to distinguish real drought conditions, and achieve the effect of widely popularizing and applying value

Active Publication Date: 2022-04-12
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problems of the prior art, the present invention proposes a vegetation drought monitoring and evaluation method, in order to overcome the traditional method of equalizing the contributions of VCI and TCI and not being able to distinguish the real drought situation, resulting in huge uncertainty in drought evaluation

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  • Vegetation drought monitoring and evaluating method
  • Vegetation drought monitoring and evaluating method
  • Vegetation drought monitoring and evaluating method

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Embodiment 1

[0043] A vegetation drought monitoring and evaluation method specifically includes the following steps:

[0044] Step 1: Screening of the control drought index: Calculate the correlation between PDSI index, SPEI index and TCI and VCI based on the correlation analysis method in the area to be measured, and select one of the PDSI index and SPEI index that is related to TCI and VCI. The index with higher correlation is used as the contrast drought index for improving VHI index; the purpose of this step is to compare and analyze the sensitivity of PDSI and SPEI index to vegetation information in a certain area, and select a contrast drought index that is more suitable for improving VHI index;

[0045] In this embodiment, the TCI-PDSI correlation coefficient, VCI-PDSI correlation coefficient, TCI-SPEI correlation coefficient, and VCI-SPEI correlation coefficient are respectively calculated based on the Pearson correlation analysis method; the correlation coefficient results are take...

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Abstract

The invention discloses a vegetation drought monitoring and evaluating method. Comprising the following steps: screening contrast drought indexes, calculating VHI indexes under different contribution values of VCI and TCI, evaluating the correlation degree between the VHI indexes with different a values and the contrast drought indexes, extracting optimal contribution values of different regions, and finally calculating the VHI indexes corresponding to the optimal contribution values of the different regions to obtain an improved VHI index spatial distribution map. And vegetation drought comprehensive evaluation of the whole research area is realized. The method provided by the invention has innovativeness in the aspects of drought influence range identification and drought degree judgment under different hydrothermal conditions and underlying surface conditions, and can provide scientific and technical support for drought formation process, drought disaster-causing mechanism, drought rapid feedback and drought monitoring and early warning research. The method has wide popularization and application values in drought control, agricultural management, grain safety production and the like.

Description

technical field [0001] The invention relates to the technical field of drought monitoring and evaluation, in particular to a vegetation drought monitoring and evaluation method, specifically a vegetation drought monitoring and evaluation method considering hydrothermal conditions and spatial heterogeneity. Background technique [0002] Drought refers to a shortage of water resources relative to normal conditions and leads to severe agricultural losses. Drought affects agricultural production by reducing the chlorophyll and water content of vegetation and changing the frequency and intensity of other disturbance factors, thereby changing the intensity of photosynthesis. [0003] Drought is often classified into several types, including meteorological drought (lack of precipitation), vegetative drought (lack of soil moisture), hydrological drought (decrease in surface runoff and groundwater) and socioeconomic drought (gap between water demand and supply). Vegetation drought h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/02
CPCY02A40/22
Inventor 屈艳萍曾靖宇王前锋吕娟杨晓静张容容吴英杰马苗苗张学君高辉吴晓萍陈茜茜
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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