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)

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