Page 75 - 《水资源与水工程学报》2023年第2期
P. 75

!34 " ! 2 #                       & ' ( ) & * + , -                               Vol.34No.2
               2023 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2023

            DOI:10.11705/j.issn.1672-643X.2023.02.09


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                             Simulationoffuturerunoffinthemiddleandupper
                                           reachesofJinshaRiverBasin

                                      DUZhiyi,NIFuquan,DENGYu,ZHOUJiahao
                  (CollegeofWaterConservancyandHydropowerEngineering,SichuanAgriculturalUniversity,Ya’an625014,China)

                 Abstract:ThechangetrendoffuturerunoffinthemiddleandupperreachesofJinshaRiverBasinwas
                 investigatedtoprovidesometechnicalsupportfortheplanningoffloodcontrolinthebasin.Basedonthe
                 SWAThydrologicalmodel ,theCMIP5datasetwasselectedtoestablishaglobalclimatemodelforthefu
                 tureperiodof2022-2050,andtherunoffchangetrendinthestudyareawasanalyzedfromthetemporal
                 andspatialscales.Theresultsshowthattheprecipitationandtemperatureinthebasinfrom2022to2050
                 arebothhigherthanthoseinthebaseperiod,andshowanupwardtrend,withalargeincrementinrain
                 fallinthesouthofthebasinandalargeincrementintemperatureinthenorthofthebasin.Underthe
                 threescenariosofRCP2.6 ,RCP4.5andRCP8.5,therunofffrom2022to2050allshowanupward
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                 trend,andthechangeratesare579×10,553×10 and299×10 m /a,respectively.Comparedwith
                 thebaseperiod,thefuturespringandautumnrunoffshowandownwardtrend,whereasthesummerand
                 winterrunoffshowanupwardtrend,withthelargestincrementinwinter,reaching10%.Therunoff
                 yieldincreasessequentiallyfromnorthwesttosoutheast ;comparedwiththebaseperiod,therunoffyield
                 inthesouthofthebasinpresentsanincreasingtrend.Theresultsindicatethattherunoffwillshowanin
                 creasingtrendinthefuture ,withagreaterincrementinwinter,andextremehydrologicaleventssuchas
                 winterfloodsmayoccur;inthefuture,thethreatoffloodsinthesouthernbasinmayfurtheraggravate.
                 Keywords:futurerunoffsimulation;spatialdistributionofrunoffyield;SWATmodel;middleandupper
                 reachesofJinshaRiverBasin




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