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1、SWAT—·basedsimulationonagriculturalnon··pointsourcepollutionintheZhegaowatershedABSTRACTNowadays，agriculturalnon-pointsourcepollution(ANPSP)isanimportantfactorforwaterqualitydeteriorationandlakeeutrophicationinChina．Sponsoredbynationalmajorprojcotof‘‘WaterBodyPollutionControlandManage
2、ment’’(2008ZX07103—002-005)andtheinternationalresearchprojectofNationalITSCenterofandTechnology(2009DFA93030)，thedissertationchoosesEngineeringtheZhegaowatershed，atypicalagriculturalwatershed，astheresearchobjecttosimulatetheagriculturalnon·pointsource(ANPS)pollutionwiththeSWAT(Soiland
3、WaterAssessmentT001)modelwhichisdevelopedbyUSDAAgriculturalResearchService(ARS)．Themaincontentsandcontributionsofthisdissertationincludefiveasfollows：parts(1)Thespatialdataincludingdigitalelevationmodel(DEM)，riverbasin，soiltype，landusetypeandtheattributedataincludingweather,hydrologya
4、ndwaterquality,soilproperties，landmanagementwithinthecatchmentwerecollectedformodeltobuildtheANPSPdatabaseofZhegaowatershed．a(chǎn)pplying(2)Thewatershedwasdiscretedinto31sub-bainsusingSWATwatersheddelineator．110hydrologieresponseunits(HRUs)whichusedforthecalculationofmodelparametersweredef
5、inedbyoverlayingthelandusemapandthesoilmap．(3)Themeasuredflowdataseriesof2006-2007wereusedtocalibratecorrelativeparametersofhydrographicsimulation．Andthemeasuredflowdataseriesof2008．2009wereusedtovalidatethemodel．Therelativeerror(Re)，linearNash—Suttcliffecoefficient(Ens)wereusedtoregr
6、essioncoefficient(Rz)andevaluatetheapplicabilityofthemodel．R2andEnsareover0．9，andReislessthan4％．Therefore．thehighprecisionillustratesthattheSWATmodelhasagoodapplicabilityinZhegaowatershed．(4)ApplyingtheSWATmodeltosimulatethespace—timedistributionoftheagriculturalnon-pointsourcepolluti
7、onloadofZhegaowatershed，anddrawthefollowingconclusions．Onthetimescales，thereisaconcentrationofagriculturalnon．pointsourcepollutioninfloodseason(ApriltoSeptember)．Onthespacedimensions，agriculturalnon-pointsourcepollutionloadconcentratedin21，23，24，30and31sub-basins．Thefivesub-basinsarei
8、nthes
