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ID:36830398
大小:3.32 MB
页数:75页
时间:2019-05-16
《基于SWAT模型的柘皋河流域农业非点源污染的数值模拟》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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.applying(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
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