Page 168 - 《水资源与水工程学报》2024年第5期
P. 168

!35 "!5 #                         & ' ( ) & * + , -                               Vol.35No.5
               2024 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2024

            DOI:10.11705/j.issn.1672-643X.2024.05.20


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                 MNFOP:TV145   QRSTU:A    QVWP:1672643X(2024)05016408
                           Characterizingreservoirsedimentdepositioncausedby

                                          bankcollapsewithREEtracer

                                                                1
                                       1
                                                                                          2
                                                                            1
                                                1
                              JIWenya,LITian,XUXiangzhou,LIYihang,GUOShengli
                 (1.SchoolofInfrastructureEngineering,DalianUniversityofTechnology,Dalian116024,China;2.InstituteofSoiland
                      WaterConservation ,ChineseAcademyofSciences,MinistryofWaterResources,Yangling712100,China)
                 Abstract:Rainfallandwaterlevelfluctuationsarecriticaltriggeringfactorsforreservoirbankfailures.
                 TakingthesoilreservoirbankinthemiddlereachesoftheYellowRiverasthecasestudy ,thispaperin
                 vestigatestheeffectsofrainfallactionandwaterlevelfluctuationsonthesourceofsedimentdeposition
                 andthesoilaccumulationcharacteristicsoftheoffshoredirectioninthereservoirarea.Bymeansofthe
                 rareearthelement (REE)tracertechnique,conceptbankslopescontainingthegentleslopeof3°,steep
                 slopeof40°andabruptlysteepsidewallof70°wereinvestigated.Fourdifferentconditionsaredesigned
                 fortheanalysis ,includingfallingwaterlevel,risingwaterlevel,thecoupledeffectofongoingrainfalland
                 fallingwaterlevel,andthecoupledeffectofongoingrainfallandrisingwaterlevel.Theresultsshowthat
                 afterfiveexperimentsinthesamegroupofterrain ,soilproductionsfromthegentleslope,steepslope,
                 abruptlysteepsidewall,andthetotalsoilaccumulationarestronglycorrelatedwiththedistancebetween
                 thesedimentdepositionandthebank ,whichcanbeexpressedbythenegativeexponentialfunction.The
                 abruptlysteepsidewallisadominantsourceofsedimentdepositioninreservoirareas,particularlyunder
                 theconditionofwaterlevelfluctuations.Theaveragemassofsedimentdepositionfromtheabruptlysteep
                 sidewallaccountedfor71% ofthetotalsedimentdepositionmassafterfiveexperimentsinthesameter
                 raingroupunderrisingandfallingwaterlevels.Furthermore ,thesedimentcontributionoftheabruptly
                 steepsidewalltothemassofsedimentdepositionisbasicallyhighestatthetoeoftheslope ,anditsaver
                 agecontributionaccountedforapproximately66%.Hence ,itisadvisabletoprotecttheabruptlysteep
                 sidewallofthereservoirbankswhenimpoundingandreleasing.

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