Page 32 - 《水资源与水工程学报》2022年第6期
P. 32

! 33 " ! 6 #                      & ' ( ) & * + , -                               Vol.33No.6
               2022 $ 12 %              JournalofWaterResources&WaterEngineering                 Dec.,2022

            DOI:10.11705/j.issn.1672-643X.2022.06.04


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                  HealthassessmentandimpactanalysisoftheDahukouRiverReachof
                           SongziEstuaryunderthechangeofwaterandsediment

                                                            2
                                           1,3
                                                                            1,3
                                                                                            2
                            CHANGLiuhong ,QINPingshan,ZHENGJingqi ,LIUXiaoqun,
                                                    1,3
                                                                  1,3
                                                                                1,3
                                       SUNWenshuo ,TANGWei ,GUOYang
              (1.SchoolofHydraulicandEnvironmentalEngineering,ChangshaUniversityofScience&Technology,Changsha410114,China;
                    2.HunanInstituteofWaterResourcesandHydropowerResearch,Changsha410007,China;3.KeyLaboratoryof
                    DongtingLakeAquaticEcoenvironmentalControlandRestorationofHunanProvince ,Changsha410114,China)
                 Abstract:SongziEstuaryisanimportantchannelforwaterandsedimenttransportationfromtheYangtze
                 RivertotheDongtingLake.TheconstructionofreservoirgroupsintheupperreachesoftheYangtzeRiv
                 erhaschangeditspatternofwaterandsedimenttransportation ,whichhasacertainimpactonthehealth
                 oftheriverandlake.TheinterannualandabruptchangesofwaterandsedimentoftheDahukouRiverin
                 theEastSongziBranchareanalyzedandahealthassessmentmodeloftheDahukouRiverconsideringwa
                 terandsedimentprocessisestablished ,basedonthemeasuredwaterandsedimentdatafrom1991to
                2017.Withthismodel,thehealthconditionoftheDahukouRiverisevaluatedanditschangetrendis
                 analyzedfromthefollowingthreeaspects,physicalform,ecologicalenvironmentandsocialservice.The
                 resultsshowthattheannualrunoffoftheDahukouRiverexperiencednosignificantchangefrom1991to
                2017 ,butthesedimenttransportdeclineddrastically,reaching98.5%.Accordingtotheabruptchange
                 analysis ,thetimenodesofwaterandsedimentabruptchangewere1997,2003and2006,whichwere
                 consistentwiththeconstructionandoperationtimeoftheupstreamreservoirs.Thehealthassessmentof
                 theDahukouRivershowthattheoverallhealthoftheDahukouRiverwasinthemediumlevel,ifthecur
                 rentconditionofwaterandsedimentremainunchanged ,thehealthleveloftheDahukouRiverwould
                 presentadownwardtrend ,sofurthercontrolandrestorationmeasuresshouldbeimplemented.
                 Keywords:waterandsedimentchange;riverhealthassessment;trendanalysis;theDahukouRiver




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