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时间:2020-03-05
《2002_Lenhart-Eckhardt-Fohrer-Frede_comparison-two-approaches-sensitivity-analysis-PCE.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、PhysicsandChemistryoftheEarth27(2002)645–654www.elsevier.com/locate/pceComparisonoftwodifferentapproachesofsensitivityanalysisT.Lenhart*,K.Eckhardt,N.Fohrer,H.-G.FredeInstitutf€urLandeskultur,Justus-Liebig-Universit€atGiessen,Heinrich-Buff-Ring26-32,D-35392G
2、iessen,GermanyReceived10February2001;receivedinrevisedform16January2002;accepted16January2002AbstractDuetospatialvariability,budgetconstraintsoraccessdifficultiesmodelinputparametersalwaysareuncertaintosomeextent.Thereforetheknowledgeofsensitiveinputparamete
3、rsisbeneficialformodeldevelopmentandapplication.Itcanleadtoabetterunderstandingandtobetterestimatedvaluesandthusreduceduncertainty.Inthepresentpapertwosimpleapproachesofsensitivityanalysisarecomparedbytheuseofthephysicallybased,continuoustimehydrologicalmod
4、elSWAT.Inbothapproaches,oneparameterisvariedatatimewhileholdingtheothersfixed,butthewayofdefiningtherangeofvariationisdifferent.Similarresultsareobtainedsuggestingthatparametersensitivitymaybedeterminedwithouttheresultsbeinginfluencedbythechosenmethod.Mostsens
5、itiveparametersforhydrologyandwaterqualityarethephysicalsoilpropertiessuchasbulkdensity,availablewatercapacityorhydraulicconductivity.Plantspecificparameterslikemaximumstomatalconductanceormaximumleafareaindexaswellasslopelength,slopesteepness,andcurvenumbe
6、ralsoshowahighsensitivity.Bothapproachescanbeconsideredasequivalent,astheyprovidethesameoverallrankingintomoreandlesssensitiveparameters.Anidentificationofthesensitiveparametersispossibleindependentlyfromthechosenvariationrange.Ó2002ElsevierScienceLtd.Allri
7、ghtsreserved.Keywords:Sensitivityanalysis;Uncertainty;Modelcalibration;Waterquality;Distributedmodels1.Introductionrepresentedinthemodel.ParametersthatarenotwellunderstoodmaybeleftunchangedeventhoughtheyarePhysicallybasedmodelsareusedtosimulateawidesensiti
8、veorareadjustedtoimplausiblevalues.Notrangeofcomplexaspects.Thepurposeofusingamodelknowingthesensitivityofparameterscanalsoresultinistoestablishbaselinecharacteristicswheneverdataistimebeinguselesslyspentonno
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