基于swat模型的三峡库区典型小流域农业非点源污染模拟分析-(5635)

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1、万方数据ofmatllchanneland：matllchanneltheeffectivehydraulicconductivity：soildepth：soilavailanewater，sedill3entwaslinearindex!themainchallneltocarryrnallningcoefficient，surfacerunoffcoefficientlagjUSLEequationkeepmeasuresthepowerfactor，powerindexsedimentwasrenewedlycaMed，andnitrogen

2、permeabilitycoefficient．Thisthesiswillcalibrateandveri毋themodelbasingonthese17parameters．(3)Withpervasiveapplicabilily，theSWATmodelcaneffectivelysimulateNon—pointsourcepollutionsthet)，picalsmallwatershedinTheThreeGorgesReservoirArea．Theresultscalibl，ationandverificationshowthat

3、R2andEnsforcalibrationperiodandverificationpel‘iodtherunoffsimulaltonvahies0．90，O．84andO．82，0．75respective]Y，R2andEnsfol‘calibrationpertodandverificationpm‘iodthesedimentsimulationvalues0．78，0．60andO．88，0．73respectivelyjR2andEnsforcalibrationperiodandverificationperiodtiletotal

4、nitrogensimulationvaluesO．78，0．71and0．71，0．65respectively，R‘andEllsforcalibrationpel‘iodandverificationpel‘iodofthetotalphosphorussimulationvalLieS0．65，0．72andO．55．O．61respectively，whichmeanalltheR2andEnsvaluescanmeettherequirementsregulations，andithasapplicabilitytosimulatethe

5、monthlyrunoffsediment，totalnitrogen，totalphosphorusloadinChengjiagouwatershed．(4)InChenjiagouwatershedtheannualaveragesedimentyieldis4763．41t，thetotalnitl‘ogenoutput8．27tandthetotalphosphorusoutput0．79t．Fromthepointtimedistribution，itwillanalyzetheinter—annualvariationandintra—

6、almualvariation：becausetheonlyfour),earsdata，inter—amaualvariesrandomly,butfromthetrendlinewecallgetthepollutionoutputdecreasesasthedecreaseraintSll；fi'omthepointintra—annualvm'iation：non—point—resourcepollutionmainlyhappensfromJulytoSeptember，whileinlow—rainfidlperiod，theoutpu

7、tssediment：totalnitrogenandtotalphosphorusarerelative眵lOW．Inaword，nomattel‘frominter—annua]andintra—allnualval‘iation，thesediment：totalnitrogenandtotalphosphorusloadshowaconsistenttrend．FromthepointspatiaIdistr：ibution，Non—pointsourcepollutionisrelativelymoreseriousinoutletwate

8、r,twocatchmentareaintilecentralwarel‘shedandnorthhighl