Comparison of Hydraulic Function and Channel-Floodplain Connectivity Between Actively and Passively Restored Reaches of Stroubles Creek 11 Years After Restoration

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dc.contributor.authorChristensen, Nicholas Danielen
dc.contributor.committeechairCzuba, Jonathan A.en
dc.contributor.committeememberHession, W. Cullyen
dc.contributor.committeememberStrom, Kyle Brenten
dc.contributor.departmentBiological Systems Engineeringen
dc.coverage.countryUnited Statesen
dc.coverage.countyMontgomery Countyen
dc.coverage.stateVirginiaen
dc.date.accessioned2022-06-25T08:00:26Zen
dc.date.available2022-06-25T08:00:26Zen
dc.date.issued2022-06-24en
dc.description.abstractA hydraulic model was developed to determine differences in the hydraulic characteristics of three different reaches of an urban- and agriculturally-impacted stream in southwest Virginia. The three reaches all had cattle excluded from the channel in 2010. The farthest upstream, Treatment 1, was left to progress without intervention beyond cattle removal while the other two, Treatments 2 and 3, were regraded and stabilized using common stream restoration techniques and a forested riparian was established. The banks of Treatment 2 were regraded to a slope of 3:1 while Treatment 3 was designed with a flat inset floodplain cut into the banks. The model results showed that the self-adjustment in Treatment 1 exhibited inset floodplains with diverse topographical structure including floodplain channels. These adjustments provided higher floodplain volume and mass exchange between the channel and the floodplain when compared with the stable, straight Treatment 2. Comparisons between Treatment 1 and Treatment 3 did not clearly show which treatment was more well connected, with some metrics showing Treatment 1 was more connected while others indicated the opposite. Overall, the findings indicate that stabilization of channelized streams without consideration of the natural planform prolongs adjustment to a channel-floodplain form with more exchange of water, sediment, nutrients and providing refuge for biota.en
dc.description.abstractgeneralA water flow model was developed to determine differences in between sections with different management practices an urban- and agriculturally-impacted stream in southwest Virginia. The three reaches all had cattle excluded from the channel in 2010. The farthest upstream, Treatment 1, was left to progress without intervention beyond cattle removal while the other two, Treatments 2 and 3, were stabilized by changing the bank slope and planting trees. The banks of Treatment 2 were regraded to a slope of 3:1 while Treatment 3 was designed with a flat section cut into the banks. The model results showed that the self-adjustment in Treatment 1 created an bench similar to Treatment 3. This section flooded more readily and allowed for higher flow of water between the channel and the floodplain when compared with the stable, straight Treatment 2. Comparisons between Treatment 1 and Treatment 3 did not clearly show which treatment was more well connected, with some metrics showing Treatment 1 was more connected while others indicated the opposite. Overall, the findings indicate that stabilization of channelized streams in their man altered state prolongs adjustment to a more natural form which provides services including flood mitigation, sediment cycling, nutrient cycling and habitat for plants and animals in and along the stream.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:35028en
dc.identifier.urihttp://hdl.handle.net/10919/110935en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectStream Restorationen
dc.subjectPassive restorationen
dc.subjectStream Hydraulicsen
dc.subjectFluvial Geomorphologyen
dc.titleComparison of Hydraulic Function and Channel-Floodplain Connectivity Between Actively and Passively Restored Reaches of Stroubles Creek 11 Years After Restorationen
dc.typeThesisen
thesis.degree.disciplineBiological Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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