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dc.contributor.authorRogers, Mark Richarden_US
dc.date.accessioned2014-03-14T20:31:23Z
dc.date.available2014-03-14T20:31:23Z
dc.date.issued2012-12-07en_US
dc.identifier.otheretd-02032013-125432en_US
dc.identifier.urihttp://hdl.handle.net/10919/31123
dc.description.abstractIn the Spring of 2012, hydraulic data was collected to calibrate three types of discharge models: stage-discharge, single-regression and multi-regression index velocity models. Unsteady flow conditions were observed at the site (â H/â t = 0.75 cm/min), but the data did not indicate hysteresis nor variable backwater effects on the stage-discharge relation. Furthermore, when corrected with a datum offset (α) value of -0.455, the stage-discharge relation r2 was equal to 0.98. While the multiple regression index velocity models also showed high correlation (r2 = 0.98) values, high noise levels of the parameter index velocity (Vi) complicated their use for the determination of discharge. Because of its reliability, low variance and accessibility to students, the stage-discharge model [Q = 5.459(H-0.455)^2.487] was selected as the model to determine discharge in real-time for LEWAS. Caution should be used, however, when applying the equation to stages above 1.0m. The selected discharge model was applied to ADCP stage (H) data collected during three runoff events in July 2012. Other LEWAS models showed similar discharge values (coefficient of variation = 0.14) while the on-site weir also produced similar discharge values. Precipitation estimates for July 19 and 24 rain events over the Webb Branch watershed were derived from IDW interpolated rain data and rainfall-runoff analyses from this data yielded an average ratio of 0.23, low for the urbanized watershed. However, since the three LEWAS models were very similar, and the on-site weir showed a lower value to LEWAS, it was concluded that any error in the ratio would be attributed to the precipitation estimate, and not the discharge models developed in this study.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartRogers_MR_T_2013_3.pdfen_US
dc.relation.haspartRogers_MR_T_fairuse_permissions.PDFen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectreal-time monitoringen_US
dc.subjecturbanized watersheden_US
dc.subjectstage-discharge relationshipsen_US
dc.subjectindex velocity methoden_US
dc.subjectacoustic doppler current profiler (ADCP)en_US
dc.subjectrainfall-runoff ratio (ROR)en_US
dc.titleThe Assessment of Stream Discharge Models for an Environmental Monitoring Site on the Virginia Tech Campusen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Planningen_US
dc.contributor.committeechairLohani, Vinod K.en_US
dc.contributor.committeememberHession, W. Cullyen_US
dc.contributor.committeememberHester, Erich T.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02032013-125432/en_US
dc.date.sdate2013-02-03en_US
dc.date.rdate2013-04-01
dc.date.adate2013-04-01en_US


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