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基于SWAT模型的阳宗海流域非点源磷负荷模拟研究.docx

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基于SWAT模型的阳宗海流域非点源磷负荷模拟研究 [Abstract] Withtheincreasingattentiontowaterpollutioncausedbynon-pointsourcephosphorus(P)loadings,itiscrucialtoaccuratelysimulateandevaluatePloadingsinwatersheds.Inthisstudy,SWATmodelwasusedtosimulateandanalyzethenon-pointsourcePloadingsintheYangzonghaiwatershed.TheresultsshowedthatthemodelperformedwellinsimulatingthemonthlyPloadingsandrunoff.ThemaximumPloadingswerefoundinagriculturallands,indicatingthesignificantcontributionofagriculturetoPpollution.Moreover,theimpactofdifferentlandusescenariosonPloadingswasalsoassessed,providingvaluableinsightsforwatershedmanagement.Thisstudycontributestoabetterunderstandingofnon-pointsourcePloadingsintheYangzonghaiwatershedandprovidesimportantinformationforwaterresourceplanningandmanagementintheregion. [Keywords] SWATmodel;non-pointsourcephosphorus;Yangzonghaiwatershed;simulation;landusescenario;waterresourcemanagement 1.Introduction Waterpollutioncausedbynon-pointsource(NPS)pollutionhasbecomeaglobalenvironmentalissue.AmongvariousNPSpollutants,phosphorus(P)isoneofthemostconcerningfactorsduetoitsadverseeffectsonwaterqualityandecologicalhealth.ExcessivePloadingscanleadtoeutrophication,harmfulalgalblooms,andthedegradationofaquaticecosystems(Correll,1998).Therefore,accurateestimationandmodelingofNPSPloadingsisessentialforefficientwaterresourcemanagementandenvironmentalprotection. TheYangzonghaiwatershed,locatedintheYunnanProvinceofChina,isanimportantsocialandeconomicregion.However,therapidurbanization,agriculturalintensification,andindustrialdevelopmentinthewatershedhaveresultedinincreasedNPSPloadings,posingathreattothewaterqualityandaquaticecosystemsofYangzonghaiLake.Therefore,itisnecessarytoassessandsimulatetheNPSPloadingsinthewatershedtodeveloptargetedmitigationstrategies. TheSoilandWaterAssessmentTool(SWAT)modelhasbeenwidelyusedforNPSpollutionsimulationandanalysis(Gassmanetal.,2007).SWATisasemi-distributedhydrologicalmodelthatcansimulatethehydrologicalprocesses,suchassurfacerunoff,evapotranspiration,andse