Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Chine → 2021 → Construction and Applicability of Comprehensive Drought Index ——Taking Middle and Upper Reaches of Heihe River Basin as An Example

Northwest A&F University (2021)

Construction and Applicability of Comprehensive Drought Index ——Taking Middle and Upper Reaches of Heihe River Basin as An Example

郭盛明

Titre : Construction and Applicability of Comprehensive Drought Index ——Taking Middle and Upper Reaches of Heihe River Basin as An Example

Auteur : 郭盛明

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
Drought is a frequent natural disaster.With the change of global climate,extreme drought events are happening more and more frequently,which has brought a great impact on the development of agriculture,industry and social economy in China.Drought index is an important tool for monitoring and evaluating the occurrence,development and evolution of drought.The traditional single-type drought index focuses on one aspect of drought and is difficult to describe the complex characteristics of drought development and transmission.The comprehensive drought index based on weight method,principal component analysis method,Copula function method and other methods has gradually attracted more and more attention.However,there are few studies on the comparison and applicability analysis of various synthetic drought index construction methods.Therefore,the comparative study on the construction method and applicability of the comprehensive drought index can provide a basis for comprehensively and systematically guiding the drought prevention and relief work.This study takes the upper and middle reaches of Heihe River Basin as the research object,calculating three kinds of single type of drought index based on parametric method and nonparametric method,including characterization of meteorological drought index(SPEI),standardized precipitation evaporation characterization of the standardization of agricultural drought soil moisture index(SSMI)and characterization of hydrology and the standardization of runoff drought index(SRI).By using entropy weight method,principal component analysis method,Copula function method,principal component analysis-Copula function method and kernel entropy component analysis method combined with three single types of drought indexes,five kinds of comprehensive drought indexes were constructed.Using Pearson correlation coefficient analysis of comprehensive drought index and drought index,the correlation between single type comparing typical historical drought events verify the applicability of the comprehensive drought index,and using the M-K trend test,wavelet analysis methods to analyze the single type of drought index and the comprehensive drought index of the most applicable characterization of space-time evolution characteristics of drought.The main conclusions are as follows :(1)Based on the data from meteorological stations,multi-source remote sensing and hydrological stations,we calculated the SPEI,SSMI and SRI at the resolution of 0.125°×0.125° at the seasonal and annual scales,and analyzed the trend evolution,cycle evolution,chronological evolution and spatial evolution of the three single types of drought indices in the middle and upper reaches of Heihe River Basin.The results showed that 89% of the meteorological drought areas showed increased drought,and 45% of the meteorological drought areas were significantly increased drought.94% of the agricultural drought areas showed drought relief,and 64% of the areas showed significant drought relief.The hydrological drought was alleviated in the whole basin,and the drought was significantly alleviated in 24% of the regions.The three types of drought indices showed a long period of33~45 years,a medium and long period of 28~30 years,a medium and long period of 11~18years and a short period of 3~10 years.In the four periods of 1970 s,1980s,1990 s and the beginning of 21 st century,the severity of meteorological drought is 1990 s > the beginning of21 st century >1980s >1970s,the severity of agricultural drought and hydrological drought is1990 s > 1970 s >1980s >the beginning of 21 st century.

Mots clés : Construction and Applicability of Comprehensive Drought Index ——Taking Middle and Upper Reaches of Heihe River Basin as An Example

Présentation (CNKI)

Page publiée le 29 octobre 2021