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Effects of discharge and substrate characteristics on FPOM retention

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dc.contributor.authorWard, Brian Richarden
dc.contributor.committeechairWebster, Jackson R.en
dc.contributor.committeememberBenfield, Freden
dc.contributor.committeememberDolloff, C. Andrewen
dc.contributor.departmentBiologyen
dc.date.accessioned2014-03-14T21:43:59Zen
dc.date.adate2008-08-29en
dc.date.available2014-03-14T21:43:59Zen
dc.date.issued1996en
dc.date.rdate2008-08-29en
dc.date.sdate2008-08-29en
dc.description.abstractI released chloride and corn pollen into artificial streams to study the effects of discharge, substrate size, leaf packs, and pools on the retention and transport of fine particulate organic matter (FPOM). I found that doubling discharge significantly decreased both hydraulic and FPOM retention (measured as pollen uptake length). However, quadrupling discharge returned both hydraulic and FPOM retention to original or higher values. There was a strong positive relationship between FPOM depositional velocity and discharge (r² = 0.846, p < 0.0001), and between FPOM depositional velocity and turbulence (r² = 0.831, p < 0.0001). Depositional velocity for all experiments was considerably less than predicted by the “fall-velocity model”. Substrate size controlled hydraulic retention through the size of interstitial spaces in the bed and FPOM retention through substrate-created turbulence. Small gravel substrate had the largest transient storage zone relative to stream cross-sectional area. Large gravel substrate had the highest depositional velocity of pollen and the most turbulence. Cobble had the least hydraulic and FPOM retention. Adding leaf packs significantly decreased hydraulic and FPOM retention. However, the number of leaf packs made little difference. Adding pools significantly increased hydraulic retention and FROM depositional velocity.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 76 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-08292008-063255en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08292008-063255/en
dc.identifier.urihttp://hdl.handle.net/10919/44482en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.W369.pdfen
dc.relation.isformatofOCLC# 35920288en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectartificial streamen
dc.subjectdischargeen
dc.subjectFPOMen
dc.subjectretentionen
dc.subjectsubstrateen
dc.subjecttransient storageen
dc.subject.lccLD5655.V855 1996.W369en
dc.titleEffects of discharge and substrate characteristics on FPOM retentionen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineBiologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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