Session 16 ic2011 schimleck

Download Session 16 ic2011 schimleck

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<ul><li> 1. Measuringthemoisturecontentofgreenhardwoodlogsusingtimedomainreflectometry H.Raybon1,L.R.Schimleck1,K.LoveMyers1,J.Sanders1, R.F.Daniels1andE.Schilling21UniversityofGeorgia2NCASI</li></ul> <p> 2. Introduction:Wetdecks Manyforestproductscompaniesstorewoodin wetdecks Maintainsteadywoodsupplywhenlogging productivitymaydecrease Woodstoredathighmoisturecontentto preventdegradationandmaintainwoodquality Directionalsprinklersdeliveraconstantsupply ofwater IntheSEUSAtheuseofwaterhasbecomean importantissue 3. Introduction:Wetdecks 4. Introduction:Wetdecks 5. PineCalibration 77.52+98.64xapparentdistance 6. Hardwoodcalibration Hardwoodwetdecksstoreawiderangeofspecies Hard hardwoods:red/whiteoaks,hickory Soft hardwoods:blackgum,redmaple,sweetgum,yellowpoplar RegionaldifferencesinthespeciesstoredGoals: DeterminewhetherTDRmeasurementscanbeusedtopredictmoisturecontentsofvarioushardwoodspecies CreateamodelormodelstopredictmoisturecontentfrominflectionpointofTDRwaveform 7. Hardwoodcalibration Fourhardwoodspeciesselected:sweetgum,yellowpoplar,redoak,whiteoak Fourlogsofeachspecies,threeboltsfromeachlog(48boltsinvolved) BoltsfittedwithTDRprobesandhydratedintankfor1month,thenallowedtoairdryover16days(9setsofmeasurements) TDRreadingstakingateachweighinginterval Samplesovendried,MCdetermined Calibrationcurvesdeveloped 8. YellowPoplar 9. Sweetgum 10. RedOak 11. WhiteOak 12. HardwoodCalibration Basedonthesigmoidalshape,logisticgrowth modelwasused ThemodelisMC= 1 + exp{ ( x )} isthemaximummoisturecontent istheinflectionpointofthecurve,locatedatthepointwherehalfthemaximummoisturecontentisobtained isrelatedtothecurvatureofthemodel andvaryrandomlywiththelog/boltto helpobtainbetterestimates 13. YellowPoplarCalibrationPlot 14. SweetgumCalibrationPlot 15. WhiteOakCalibrationPlot 16. RedOakCalibrationPlot 17. ManipulativeStudies Twomanipulativestudysites OffermanWoodyardnearBlackshear,GARayonier McBeanWoodyardnearAugusta,GAInternationalPaper 18. OffermanWoodyardTreatments: Twotreatments nominaland30%reductionbyturningoffthesprinklerstwodaysperweek Actualratesnotknownatthistime TworeplicationsofeachtreatmentduetolimitedspaceSpecies: DuetoavailabilityinFlatwoodsincluded: Sweetgum 24trees Yellowpoplar 24trees 19. OffermanWoodyard 20. OffermanWoodyard 21. OffermanWoodyard 22. OffermanWoodyard 23. OffermanWoodyardDesign2probespertree1treeofeachspeciesineachposition 24. Offermanwoodyard FirstreadingstakeninAugust2010duringinstallation,sprinklersturnedonwithinaweek Yellowpoplarmoistureunsteady,evenfallingbelowtheoriginallevels Sweetgummoisturegenerallyincreasing 25. OffermanFirstPlots Unstablemoisturecontent Currentlynotreatmenteffecttreatmentsbeganasdifferentavgmoisturecontents 26. OffermanFirstPlots Morestablemoisturecontent Currentlynotreatmenteffecttreatmentsbeganasdifferentavgmoisturecontents 27. McBeanWoodyard Again,twotreatmentsNominalrate30%reductionbyturningoffwater2daysperweekActualratesnotknownatthistime Tworeplications TwoSpecies Sweetgum 24trees Redoak 24trees availability 28. Conclusions TDRmonitoringcanbeusedtomeasuremoisturecontentsuccessfullyinhardwoods Eachspeciesrequiresitsownmodel Themodelispartiallydeterminedbythemaximummoisturecontentofthespeciesbeingmonitored TDRisapplicabletomeasuringmoisturecontentinoperationalwetdecks 29. Acknowledgements NCASIforprovidingfundingforthisstudy InternationalPaperandRayonierforproviding studysites </p>