Page 103 - 《水资源与水工程学报》2023年第2期
P. 103

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

            DOI:10.11705/j.issn.1672-643X.2023.02.12


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                    InfluenceoftopographicchangesofDongtingLakeonfloodprocess

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           LIUYizhuang     ,JIANGChangbo ,XIANGZhaohui,LONGYuannan ,DENGBin ,TANGXiaojun                     4
           (1.SchoolofHydraulicandEnvironmentalEngineering,ChangshaUniversityofScience&Technology,Changsha410114,China;2.Key
               LaboratoryofDongtingLakeAquaticEcoenvironmentalControlandRestorationofHunanProvince ,Changsha410114,China;
              3.StateKeyLaboratoryofHydrology-WaterResourcesandHydraulicEngineering,NanjingHydraulicResearchInstitute,Nanjing
                   210098,China;4.DongtingLakeWaterConservancyAffairsCenterofHunanProvince,Changsha410007,China)
                 Abstract:BasedonthemeasuredtopographydataofDongtingLakein2003and2011,apreviouscali
                 brated2Dhydrodynamicmodelwasadoptedtosimulatetheimpactoflaketopographicchangeonthe
                 floodprocessofDongtingLakeusingthe2003floodasanexample.Theresultsshowthatover40% to
                 pographyofthelakesubsidedmorethan0.10m ,especiallytheXiangjiangspillway,thetopographyof
                 itstalwegsubsidedby5.72m.Accordingtothesimulationofthe2003floodprocess,whentheflood
                 processwasdominatedbytheFourRivers,thefloodpeakwaterleveldecreasedbymorethan0.40and
                0.20mintheSouthandWestDongtingLakeunderthetopographicconditionof2011comparedwiththat
                 of2003;butfortheEastDongtingLake,thewaterlevelonlydecreasedsignificantlyinthesouthernarea
                 withlargetopographicchanges.ThewatersurfacegradientdecreasedintheDoumizui-Chenglingjisec
                 tion ,butincreasedinthespillwayoftheSouthDongtingLake.Forthefloodprocessdominatedbythein
                 flowoftheYangtzeRiver ,thefloodpeakwaterlevelinDongtingLakedecreasedby0.15m,andthewa
                 tersurfacegradientchangedlittleintheDoumizui-ChenglingjisectionandtheSouthDongtingLake ,

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