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dc.contributor.authorSneesby, Ethan Paulen_US
dc.date.accessioned2019-04-05T08:01:13Z
dc.date.available2019-04-05T08:01:13Z
dc.date.issued2019-04-04
dc.identifier.othervt_gsexam:19197en_US
dc.identifier.urihttp://hdl.handle.net/10919/88836
dc.description.abstractWetland impacts in the Mid-Atlantic USA are frequently mitigated via wetland creation in former uplands. Regulatory approval requires a site-specific water budget that predicts the annual water level regime (hydroperiod). However, many studies of created wetlands indicate that post-construction hydroperiods frequently are not similar to impacted wetland systems. My primary objective was to evaluate a water budget model, Wetbud (Basic model), through comparison of model output to on-site water level data for two created forested wetlands in Northern Virginia. Initial sensitivity analyses indicated that watershed curve number and outlet height had the most leverage on model output. Addition of maximum depth of water level drawdown greatly improved model accuracy. I used Nash-Sutcliffe efficiency (NSE) and root mean squared error (RMSE) to evaluate goodness of fit of model output against site monitoring data. The Basic model reproduced the overall seasonal hydroperiod well once fully parameterized, despite NSE values ranging from -0.67 to 0.41 in calibration and from -4.82 to -0.26 during validation. For RMSE, calibration values ranged from 5.9 cm to 12.7 cm during calibration and from 8.2 cm to 18.5 cm during validation. My second objective was to select a group of "design target hydroperiods" for common Mid-Atlantic USA wetland types. From > 90 sites evaluated, I chose four mineral flats, three riverine wetlands, and one depressional wetland that met all selection criteria. Taken together, improved wetland water budget modeling procedures (like Wetbud) combined with the use of appropriate target hydroperiod information should improve the success of wetland creation efforts.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis item is protected by copyright and/or related rights. Some uses of this item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectWetland creationen_US
dc.subjectmodel evaluationen_US
dc.subjectsensitivity analysisen_US
dc.subjectcalibrationen_US
dc.subjectvalidationen_US
dc.subjectwetland designen_US
dc.titleEvaluation of a Water Budget Model for Created Wetland Design and Comparative Natural Wetland Hydroperiods.en_US
dc.typeThesisen_US
dc.contributor.departmentCrop and Soil Environmental Sciencesen_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.disciplineCrop and Soil Environmental Sciencesen_US
dc.contributor.committeechairDaniels, Walter L.en_US
dc.contributor.committeememberStewart, Ryan Danielen_US
dc.contributor.committeememberGalbraith, John M.en_US
dc.contributor.committeememberThompson, Theresa M.en_US


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