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Northwest A&F University (2021)

Construction of Drought Indexes and Analysis of Spatial-temporal Characteristics of Drought in Shiyang River Basin Based on SWAT

梁筝

Titre : Construction of Drought Indexes and Analysis of Spatial-temporal Characteristics of Drought in Shiyang River Basin Based on SWAT

Auteur : 梁筝

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
The drought index is the basis of drought monitoring,evaluation and management.The construction of a comprehensive drought index and research on the spatio-temporal characteristics of drought evolution can provide a basis for regional drought prevention and drought management.In view of the shortage of data in alpine mountainous areas and the difficulty of a single drought index to reflect all the characteristics of drought,this paper takes the five major watersheds of the upper Shiyang River in Gansu Province as an example,and constructs a watershed SWAT hydrological model based on hydrometeorological data from1981 to 2017.Combine simulated evapotranspiration,soil moisture,runoff with measured rainfall data,use parameterized or non-parametric methods to construct univariate drought indices,such as the Standardized Precipitation Evapotranspiration Index(SPEI),the Standardized Soil Moisture Index(SSI)and the Standardized Runoff Index(SRI).Use Mann-Kendall test and R/S analysis method and other methods to analyze the temporal and spatial characteristics of meteorological,agricultural,and hydrological drought in the study area.The nested Archimedean construction method is used to construct the meteorological-agricultural-hydrological comprehensive drought index(CDI)to discuss the applicability of the comprehensive drought index by using historical drought events and univariate drought indexes and analyze the temporal and spatial characteristics of the comprehensive drought.The following main results were obtained :(1)Based on the meteorological and hydrological data of five river systems(Xida River,Dongda River,Xiying River,Jinta River,and Zamu River)in the upper reaches of Shiyang River,SWAT hydrological model is established,and the model parameters are calibrated and validated by the SUFI2 algorithm in SWAT-CUP.The rates of Xida River,Dongda River,Xiying River and Jinta River all meet the uncertainty requirements of P-factor(29)0.7 and R-factor(27)1.5 during the calibration and validation period.The uncertainty of the calibration period of Zamu River Basin is relatively large,while the uncertainty of the validation period is within an acceptable range.The accuracy in calibration period is generally higher than the simulation accuracy of the verification period.Both the R2 and ENS of the Xiying River and Jinta River basins were above 0.7 during the calibration and validation period.The R2 and ENSin calibration period of the Xida River,Dongda River and Zamu River basins are all above0.7,and the R2 and ENS during the validation period are concentrated between 0.68 and 0.69.The results show that the uncertainty and simulation accuracy of the constructed hydrological model meet the requirements and can be used to describe the hydrological process of the basin.

Mots clés : SWAT model ;comprehensive drought index ;the nested Archimedean construction ;Shiyang River basin ;

Présentation (CNKI)

Page publiée le 30 octobre 2021