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Dalian University of Technology (2021)

The Response Relationship of Hydrological and Agricultural Drought to Meteorological Drought in the Lower Reaches of Nenjiang River

华悦

Titre : The Response Relationship of Hydrological and Agricultural Drought to Meteorological Drought in the Lower Reaches of Nenjiang River

Auteur : 华悦

Grade : Master 2021

Université : Dalian University of Technology

Résumé partiel
In the past century,the global climate has been experiencing significant warming,leading to frequent droughts,which has a profound impact on human social and economic development.Since precipitation deficit is the leading factor of drought,in order to reduce the impact of drought,it is necessary to improve the understanding of the propagating relationship between different drought types,understand the response and potential transmission mechanism of different drought types the potential transmission mechanism,so as to be able to carry out early warning of hydrological and agricultural drought based on meteorological drought.The Songnen Plain on both sides of the lower Nenjiang River is an important grain producing area in China,with extensive wetland and natural water conservation conditions.Under the influence of many factors such as climate change and uneven distribution of water resources,the problem of water shortage in the lower reaches of the Nenjiang River has become increasingly prominent.Therefore,quantitative analysis of drought propagation mechanism is of great significance to irrigation,water diversion and regional development planning in the lower reaches of the Nenjiang River.First of all,this paper uses the trend-free pre-whitening MK trend test method(TFPW-MK)to analyze the meteorological,hydrological,and agricultural drought trends in the lower reaches of the Nen River.Then,the meteorological and hydrological standardized drought index(SPI,SRI)thresholds were determined,and meteorological and hydrological drought events were identified through the run-length theory.Based on the Standardized Drought Index(SPI)and the Self-adjusted Palmer Drought Index(sc-PDSI),the spatio-temporal overlap method is used to identify meteorological and agricultural drought events.On this basis,analyze the regional drought development law,extract the corresponding characteristic variable pairs,establish the response relationship of meteorological to agricultural and hydrological drought characteristics,obtain the response threshold of drought characteristics,and comprehensively analyze the response relationship of hydrology and agriculture to meteorological drought.

Mots clés : Lower Nenjiang River ;Drought Propagation ;Drought Characteristics ;Response threshold ;

Présentation (CNKI)

Page publiée le 27 octobre 2021