Exercise-13-Water-Quality-Calibration

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1、BASINS/HSPFTrainingExercisesExercise13–WaterQualityCalibrationBASINS/HSPFApplicationStepsStudyParameterHydrologicWaterQualityTimeseriesDataDefinition/ModelingDevelopment/ModelCalibration/Calibration/ScenarioAnalysisManagementStrategySetupValidationValidationThisexerciseisacontin

2、uationofExercise12,whichprovidedanintroductiontomodelingnutrients,biochemicaloxygendemand(BOD),dissolvedoxygen(DO),andalgae.Inthisexercise,wewillfocusoncalibratingtheseconstituentsbyadjustingkeyparametervalues.Ourgoalisto‘tune’ourmodelresultssothattheyaresimilartoavailableobserv

3、eddata(ortoexpected/reasonablerangesforparametersforwhichtherearen’tfieldobservations).Thisexercisewillhelpyougainabetterunderstandingofhowthewatershed‘works’(asrepresentedbythemodel)byassessingthedegreetowhichnon-pointsources,pointsourcesandinstreamprocessesaccountforobservedco

4、ncentrationsatthewatershedoutlet.Thisexerciseisdividedintothreesections,inwhichwewillattempttocalibratewaterqualityby:(1)adjustingONLYnon-pointsources,(2)adjustingONLYinstreamparameters,and(3)adjustingBOTHnon-pointsourceloadingsandinstreamparameters.InExercise12,wedidaroughsensi

5、tivityanalysisforsomekeyparametersthataffectnutrient,algae,anddissolvedoxygenconcentrations.Inthisexercise,wewillquantifyhowwellwearesimulatingvariousconstituentsbycomparingourresultswitheitherobservedinstreamconcentrationsorexportcoefficients.Questionsaddressedinthisexercise:1.

6、)HowdoIdeterminewhetherIamover-predictingorunder-predictingnutrientloadsandinstreamconcentrations?2.)HowdoIcalibratethenon-pointsourceloadscomingfromthewatershed?3.)HowdoIcalibratetheinstreamportionofmymodelsothatsimulatedinstreamconcentrationsaresimilartoobservedinstreamconcent

7、rations?4.)IfIamstillover-simulatingorunder-simulatingvariousconstituentsandIhaveadjustedinstreamcalibrationparameterswithintheirlimits,whatdoIdonow?5.)Whatarethestepsrequiredforwaterqualitycalibration?A.ExaminingInitialModelResultsQUESTIONANSWERED:1.)HowdoIdeterminewhetherIamov

8、er-predictingorunder-predictingnutrientloadsand