Page 55 - 2022年第53卷第10期
P. 55
Dynamicchangeanddrivingforceanalysisofhydrologicaldrought
duration - severitydependencystructureintheWeiheRiverBasin
MAChuanhui,HUANGShengzhi,HUANGQiang
(StateKeyLaboratoryofEco - hydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an 710048,China)
Abstract:Inachangingenvironment,exploringthedynamicchangesanddrivingforcesofdroughtmulti - attribute
dependentstructureisofgreatsignificanceforregionaldroughtriskmanagement.ThispapertakestheWeiheRiver
BasinastheresearchobjectandappliestheCopula - basedmaximumlikelihoodratio (CLR)methodtodiagnosethe
abruptchangeofhydrologicaldroughtduration - severitydependencestructure,alongwithanalyzingthecharacteristics
beforeandaftertheabruptchange.Fromtheperspectiveofclimatechange (meteorologicalfactors,characteristicsof
meteorologicaldrought )andhumanactivities,clarifythepossibledrivingfactorsofhydrologicaldroughtduration - se
veritydependencystructuredynamics ,andobtaintherankingoftheimportanceoftheinfluencingfactors.Theresults
showedthat :(1)Thehydrologicaldroughtduration - severitydependencestructureofHuaxian,Zhangjiashan,and
Zhuangtoustationshadabruptchangepointin1993,1982,and1994respectively;(2)Underrelativelylongdura
tion(9 - 12monthsatHuaxianstation,5 - 12monthsatZhuangtoustation),underthesamedurationofHuaxianand
Zhuangtoustation ,theseveritybeforeandafterthechangepointincreases,andasthedurationbecomeslonger,the
magnitudeoftheincreaseinseverityincreases ,anddroughthasincreasedsignificantly;(3)Inadditiontotheim
pactofmeteorologicaldroughtontheevolutionofhydrologicaldrought ,thehydrologicaldroughtduration - severityde
pendencystructuredynamicsismainlydrivenbywater “demand - side”factors(humanwaterconsumption,potential
evapotranspiration).Ingeneral,theresearchresultsprovideanewideaforthenon - stationaritydetectionofdrought
multi - attributedependencystructures ,andtheproposedframeworkcanbeextendedtootherwatersheds.
Keywords:hydrologicaldrought; Copulafunction; droughtduration - severitydependencystructure; driving
force;RandomForestMethod;WeiheRiverBasin
(责任编辑:韩 昆)
(上接第 1179页)
Agriculturaldroughtassessmentbasedonthecoupledhydrology - crop
growthmodelandCWAPI
2
1,2
2
ZHANGYuliang ,WUZhiyong,HEHai
(1.SchoolofCivilEngineering,HefeiUniversityofTechnology,Hefei 230009,China;
2.CollegeofHydrologyandWaterResources,HohaiUniversity,Nanjing 210098,China)
Abstract:Thetemporalandspatialdevelopmentofagriculturaldroughtisrevealedusingthedroughtindexbased
onthesimulatedsoilwatercontent ,whichwaswidelyappliedtoagriculturaldroughtassessmentonalargescale.
Currently ,whensimulatingsoilwatercontentfordroughtassessment,hydrologicalmodelsareoftenused.How
ever ,hydrologicalmodelsoftenoversimplifythecropmoduleorevenlackthecropsimulationscheme,cannot
simulatethecropwaterdemand ,andthesoildroughtindexonlybasedonthesoilwatercontentcannotaccurately
assesstheactualagriculturaldroughtduetotheneglectedcropwaterdemand.Inthisstudy,thecoupledhydrolo
gy - cropgrowthmodel ,namelyVariableInfiltrationCapacity - EnvironmentalPolicyIntegratedClimate(VIC - EP
IC),wasbuiltconsideringirrigationinfluences,theCropWaterAnomalyPercentageIndex(CWAPI)basedon
thevariationprocessofcropwaterdemandandconsumptionfromthesimulationofVIC - EPICwasproposed,and
themethodofregionalagriculturaldroughtassessmentwasstudiedintheQingkouriverbasinofChina.Thebuilt
CWAPIshowedthestateandcumulatedimpactofcropwaterstressonthecropgrowthbasedontheverificationre
sultsduetotheconsiderationoftheinfluenceofcropwaterdemand ;becausetheinfluencesofthecropplantingra
tio ,croprotationtypes,andirrigationwereconsidered,CWAPIrevealedtheregionalcropdroughtdegreemore
objectivelythanSoilMoistureAnomalyPercentageIndex(SMAPI).Theresultsshowedthattheeffectofthecrop
plantingratio ,croprotationtypes,andirrigationneededtobeconsideredwhenassessingtheagriculturaldrought.
Keywords:thecoupledhydrology - cropgrowthmodel;cropwaterrequirementsandconsumption;CropWater
AnomalyPercentage Index (CWAPI); SoilMoisture Anomaly Percentage Index (SMAPI); agricultural
droughtassessment
(责任编辑:于福亮)
1
— 1 9 3 —