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ID:33399838
大小:7.15 MB
页数:63页
时间:2019-02-25
《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)》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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