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AssessmentofcomprehensiveintensityofecologicalDroughtinsummerand
autumninsixprovinces (city)ofYangtzeRiverBasin
1,2
3,4
1,2
1,2
3,4
JIANGTianliang ,QUYanping ,LJuan ,SUXiaoling ,DONGRongrong
(1.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China;
2.ResearchCenteronFloodandDroughtDisasterReduction,Beijing 100038,China;
3.SchoolofWaterConservancyandCivilEngineering,NorthwestA&FUniversity,Yangling 712100,China;
4.KeyLaboratoryofAridAreaAgriculturalWaterandSoilEngineering,MinistryofEducation,
NorthwestA&FUniversity,Yangling 712100,China)
Abstract:TheseveredroughtintheYangtzeRiverBasinsinceJune2022hashadasignificantimpactonagricul
ture,energy,andecology.OnAugust11,theMinistryofWaterResourceslaunchedalevelIV responseto
droughtinAnhui ,Jiangxi,Hubei,Hunan,Chongqing,andSichuanprovinces,whicharethemostseverelyaf
fectedareasoftheYangtzeRiverBasin.Atpresent,therearefewstudiesonthequantitativeassessmentofecologi
caldrought.Inviewofthis ,thestandardizedecologicalwaterdeficitindexwasconstructedtoevaluatetheimpact
ofdroughtontheterrestrialecosysteminsixprovinces (city).Modifiednormalizedwaterdifferenceindexwasused
toevaluatetheitsimpactonaquaticecosystem.Then ,theinterannualvariationofcomprehensiveintensityofecologi
caldroughtinthestudyareawascalculatedbasedonthecharacteristicsofdroughtevents.Finally ,thereasonforec
ologicaldroughtin2022wasdiscussed.Theresultsshowedthat :(1)Juneistheinitialstageofecologicaldrought.
FromJulytoSeptember,theseverityandaffectedareaofterrestrialecologicaldroughtareincreasing.Astherainfall
increasedandvegetationwaterrequirementsdecreasedfrom OctobertoNovember ,droughtseverityreleased.(2)
Duringtheperiod1982to2022,comprehensiveintensityofecologicaldroughtinstudyregionexperiencedanincreas
ingandfluctuatingtrend.In2022,theproportionofhigh - intensityareasreacheditshighestlevelsince1982,which
was67.4% higherthanthehistoricalaverage.(3)EcologicaldroughtfromJunetoNovember2022,themostseri
oussince1982,wascausedbythelowintensityofecologicalwatersupplyandthehighintensityofecologicalwater
demand,whichinducedbylessprecipitationandsurfacewater,andlonghightemperaturedays,respectively.
Keywords:YangtzeRiverBasin;ecologicaldrought;evolutioncharacteristic;comprehensiveintensityofdrought
(责任编辑:耿庆斋)
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