Page 90 - 《水资源与水工程学报》2022年第1期
P. 90

!33 " ! 1 #                       & ' ( ) & * + , -                               Vol.33No.1
               2022 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2022

            DOI:10.11705/j.issn.1672-643X.2022.01.12


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               BCDEF:TV11;P426.616   GHIJK:A    GLMF:1672643X(2022)01008607

                          Spatiotemporalevolutioncharacteristicsofmeteorological
                                           droughtsinnorthwestChina

               LIUYangyi,MAOWenjing,LISiqi,ZHAOXinyu,ZHANGXuewu,WUHaijiang,SUXiaoling
                   (CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling712100,China)

               Abstract:TheclimateregimesinnorthwestChinaaredry,withscarceprecipitationandfrequentdroughts.
               Basedonthemeteorologicalobservationdataof136meteorologicalstationsinnorthwestChinafrom1961to
               2016 ,weusedthestandardizedprecipitationevapotranspirationindex(SPEI)tocharacterizemeteorological
               droughts,linearregression,Pettittmutationtest,andMorletwaveletanalysistoanalyzetheevolutioncharac
               teristicsofmeteorologicaldroughtsinnorthwestChina.Theresultsshowthataninsignificantwettingtrendwas
               shownoverthewholestudyregion.Fromtheperspectiveofadministrativedivisions ,Shaanxi,GansuProvince
               andNingxiaAutonomousRegionshowedaninsignificantdryingtrend,whereasQinghaiProvinceandXinjiang
               AutonomousRegionshowedasignificantwettingtrendindiverseseasons.Thechange-pointofmeteorologi
               caldroughtsinthewholeregionandindividualprovinces (autonomousregions)weremainlyconcentratedin
               the1970s-1990s;however,onlythespringinQinghaiProvinceandtheyearandfourseasonsinXinjiang
               AutonomousRegionpassedthesignificancetest.Thedroughtsinthewholenorthwestregionandtheprovinces
               (autonomousregions)hadamajorperiodof3-9,10-15,17-23,and25-27years.Fromaspatialper
               spective ,thenorthwestregionshowedatrendofdryingintheeastandwettinginthewest.Theresultscan
               provideatechnicalsupportfordroughtmitigationandwaterresourcesplanninginnorthweatChina.
               Keywords:meteorologicaldrought;standardizedprecipitationevapotranspirationindex(SPEI);drought
               spatiotemporalevolution ;northwestChina

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