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Northeast Agricultural University (2021)

A Study on Analysis of Multi Drought Indices Characteristics Based on Climate Change and Development of a Composite Drought Index

池诺金(Muhammad Ahmad Niaz)

Titre : A Study on Analysis of Multi Drought Indices Characteristics Based on Climate Change and Development of a Composite Drought Index

Auteur : 池诺金(Muhammad Ahmad Niaz)

Grade : Doctoral Dissertation 2021

Université : Northeast Agricultural University

Résumé partiel
The accurate analysis of spatiotemporal patterns of temperature,precipitation and agro-meteorological droughts,play a crucial role in the sustainable management of water resources.Various types of methodologies based on climatic trends statistics,drought indices and future forecasting approaches have been used in this study for the analysis of historical and future meteorological changes and drought anomalies with the aim to provide a comprehensive study for the researchers and policy makers for the given region.The study has been conducted at the thirty-six meteorological stations of Heilongjiang Province,China.Firstly,meteorological drought has been identified for comparative analysis by considering four well known drought indices named as Reconnaissance Drought Index(RDI),Standardized Precipitation Evaporative Drought Index(SPEI),Effective Drought Index(EDI)and most commonly used Standardized Precipitation Index(SPI),at various time-step by using historical data.Moreover,Mann-Kendall trend test at 5% significant level was applied for assessing droughts trend in the basin.Drought outcomes showed that 12-month series for Songhua River basin is appropriate for the assessment of drying conditions and comparison of drought indices.The Pearson’s correlation analysis of meteorological variables and drought indices discovered that SPI is a well performance index for the assessment of regional drought(r = 0.99).The climatic conditions were severe and extremely dry in the study region during the years of 1990 and 2001.Furthermore,drought indices that compute the drought events by their drought initiation,termination time and statistical properties such as frequency,severity,intensity and duration are practically stratagems for the estimating and monitoring the impact of drought events on the region.

Mots clés : drought indices ;meteorological drought ;climate change ;spatiotemporal;IWDI ;agrometeorological drought ;forecasting;

Présentation (CNKI)

Page publiée le 19 février 2022