water quality modeling in galveston bay wit - 德克

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1、WaterQualityModelinginGalvestonBaywithModelBuilderByTimWhiteakerandJonGoodall6/6/031IntroductionDuetohighconcentrationsoffecalcoliforms,GalvestonBayinTexasisconsideredanimpairedwaterbodyforoysterwateruse.Toidentifythesourcesofthecoliformloads,ananalysisofthebayand

2、thewatershedsdrainingtothebaywasperformedbyReemZounattheUniversityofTexasatAustin.Zoun'sworkinvolvedapplyingtheArcHydroschematogeospatialdatadescribingthebayregioninordertosimulatepointandnonpointsourceloadsaccumulatinginthebay(Figure1.1).TheworkwasperformedintheA

3、rcMapenvironmentusingstandardArcGISfunctionalityandtheArcHydrotools.ThisworkbecamethesubjectofZoun'sMastersThesis.Forthecurrentresearchdescribedinthispaper,anArcGIS9.0modeliscreatedusingModelBuilderinArcToolboxtoperformthesamecalculationsasdescribedinZoun'sthesis.

4、Themodelassumesthataschematicnetworkrepresentingtheregionhasalreadybeencreated,andthattraveltimesandotherparametershavealreadybeencalculatedfortheschematiclinksandnodes.Themodelthenprocessesrainfall,landuse,andwatersheddatatocalculateloads,andthenpassesthoseloadst

5、hroughtheschematicnetworkuntilfinalloadshavebeencomputedforthe6baysintheregion.Thispaperdescribestheprocessingopsappliedtotheschematicnetworktocalculateloads.Thenthewaterqualitymodelisbrieflydescribed,followedbyacomparisonbetweenmodelresultsandtheresultscalculated

6、byZoun.Figure1.1–GavlestonBaywatershedwithschematicnetwork2SchematicProcessingOpsTherearethreetypesoflinksandnodesusedfortheGalvestonBaybacteriastudy(Tables2.1and2.2).Eachtypecanprocessreceivedandpassedloadsinauniqueway.Thedefaultforpassingandreceivingloads,setbyt

7、heprocessingschematicsmodel,istoreceiveandthenpassthetotalload,withoutanylossesoradditions.Ifalinkornodemustreceiveorpassaloadwithanassociatedlossoradditionofmass,aprocessingfunctionmustbewrittentohandtheprocess.Forbackgroundinformationaboutschematicnetworksproces

8、sing,pleaseseeProcessingSchematicNetworksonthisCD.Table2.1Explanationofprocessingoperationsforschemalinks.Table2.2Explanationofprocessingoperationsforsc