流域土地利用和河道生态工程的洪水效应模拟分析

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1、TheeffectsofriverrestorationoncatchmentscalefloodriskandfloodhydrologyLianSun3/16/2017Copyrights:SchoolofEnvironment,BeijingNormalUnveisityPublishedonEARTHSURFACEPROCESSESANDLANDFORMSIn2016InterpretationofHighQualityLiterarure:AbstractBackground:Inthefaceofchallengeoffloodri

2、sk,acontinuedrelianceonengineeredat-a-pointflooddefensesisseenasbothunrealisticandundesirable.Researchadvances:Thecontributionof‘softengineering’solutions(e.g.riparianforests,woodinrivers)tointegrated,catchmentscalefloodriskmanagementhasbeendemonstratedatsmallscalesbutnotlarge

3、rones.Inthisstudy:weusereducedcomplexityhydrologicalmodellingtoanalyzetheeffectsoflanduseandchannelchangesresultingfromriverrestorationuponfloodflowsatthecatchmentscale.Results:1Usingengineeredlogjams(溪流倒木)havehighlyvariableimpactsoncatchment-scalefloodpeak.2Themostpromisingre

4、storationscenariosforfloodriskmanagementareforriparianforestrestorationatthesub-catchmentscale,representing20–40%ofthetotalcatchmentarea,wherereductionsinpeakmagnitudeofupto19%areobservedthroughde-synchronizationofthetimingsofsub-catchmentfloodwaves.FloodplainforestandEngineer

5、edlogjamsManagersrestorefloodplainmorphologyandriverchanneltomodifythefloodhydrograph(洪水过程线)Floodplainforest:alandcoverrestorationEngineeredLogjams(ELJs):ariverchannelrestorationPrinciple:thegeomorphologicalconfigurationofadrainagebasindeterminesthetimethatittakesforarunoffu

6、nittotraveltoapointwherethereisafloodrisk.Relativefineinsmallerbasin,butnotclearinlargerbasin.RequireaspatiallyexplicitevaluationofwhereeachinterventionisaddedFloodplainforestandLogjamsFloodplainforest:alandcoverrestorationFloodplainforestefficacy:interception,infiltration,slo

7、wingconveyance,attenuatingrunoff,andefficacyincreasesastheforestages.However,therearefewprojectsthathavetriedtoassesshowdifferentextentsandlocationsoffloodplainforestcontributetofloodriskchangesatdifferentspatialscales.FloodplainforestandLogjamsEngineeredlogjams:ariverchannelr

8、estorationEngineeredLogjams(ELJs)efficacy:Increasehydraulicro