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基于AnnAGNPS模型的丹江口库区黑庙沟流域非点源污染研究.docx

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基于AnnAGNPS模型的丹江口库区黑庙沟流域非点源污染研究 Abstract Thisstudyaimedtoinvestigatenon-pointsourcepollutionintheHeimiaogouwatershedoftheDanjiangkouReservoirareausingtheAnnAGNPSmodel.Theresultsshowedthatthemodelwaseffectiveinpredictingtheamountofsediment,nitrogen,andphosphorusloss.Thestudyalsoidentifiedthemajorsourcesofnon-pointsourcepollutionasagriculturalland,bareland,andforestland.Toreducenon-pointsourcepollutionintheHeimiaogouwatershed,itisrecommendedthatappropriatelandmanagementpracticesbeimplemented,suchastheuseofvegetativecover,terracing,andconservationtillage. Introduction Non-pointsourcepollutionisamajorenvironmentalchallengeinwatershedsworldwide.Itiscausedbythedischargeofpollutantssuchassediment,nitrogen,andphosphorusintosurfacewatersfromvarioussourcesincludingagriculturalland,urbanrunoff,andresidentialactivities.IntheDanjiangkouReservoirarea,non-pointsourcepollutionhasbeenidentifiedasasignificantthreattowaterqualityandecosystemhealth. TheAnnAGNPS(AnnualizedAgriculturalNon-PointSource)modelisawidelyusedtoolforpredictingnon-pointsourcepollutioninwatersheds.Itisdesignedtosimulatenutrientandsedimenttransportandestimatenon-pointsourcepollutionfromagriculturalandforestedland.Themodelisusefulinidentifyingthemajorsourcesofnon-pointsourcepollutionanddevelopingeffectivestrategiesforreducingit. ThisstudyaimstoapplytheAnnAGNPSmodeltoinvestigatenon-pointsourcepollutionintheHeimiaogouwatershedoftheDanjiangkouReservoirarea.Byidentifyingthemainsourcesofnon-pointsourcepollution,thisstudyaimstoproviderecommendationsformitigatingitsimpact. Methodology ThestudyareawastheHeimiaogouwatershed,whichcoversanareaofapproximately3.8km^2intheDanjiangkouReservoirarea.TheAnnAGNPSmodelwasusedtosimulatesediment,nitrogen,andphosphoruslossesfromthelandsurface. Themodelwascalibratedandvalidatedusingdatacollectedfromfourmonitoringsiteslocatedwithinthewatershed.Thedatausedforcalibrationandvalidationincludedsediment,nitrogen,andphosphorusconcentrationsinsurfacerunoff,rainfall,andsoilphysicalproperties. Toident