Use of a Three-Dimensional Reactive Solute Transport Model for Evaluation of Bioreactor Placement in Stream Restoration

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dc.contributor.advisorUMBC Faculty Collection
dc.contributor.advisorUMBC Geography and Environmental Systems Department
dc.contributor.advisorUMBC Chemical, Biochemical & Environmental Engineering Department
dc.contributor.authorCui, Zhengtao
dc.contributor.authorWelty, Claire
dc.contributor.authorGold, Arthur J.
dc.contributor.authorGroffman, Peter M.
dc.contributor.authorKaushal, Sujay S.
dc.contributor.authorMiller, Andrew J.
dc.date.accessioned2018-09-21T19:03:13Z
dc.date.available2018-09-21T19:03:13Z
dc.date.issued2016-03-21
dc.description.abstractA three-dimensional groundwater flow and multispecies reactive transport model was used to strategically design placement of bioreactors in the subsurface to achieve maximum removal of nitrate along restored stream reaches. Two hypothetical stream restoration scenarios were evaluated over stream reaches of 40 and 94 m: a step-pool scenario and a channel re-meandering scenario. For the step-pool scenario, bioreactors were placed at locations where mass fluxes of groundwater and nitrate were highest. Bioreactors installed over 50% of the total channel length of a step-pool scenario (located to intercept maximum groundwater and nitrate mass flux) removed nitrate-N entering the channel at a rate of 36.5 kg N yr⁻¹ (100 g N d⁻¹), achieving about 65% of the removal of a whole-length bioreactor. Bioreactor placement for the re-meandering scenario was designed using a criterion of either highest nitrate mass flux or highest groundwater flux, but not both, because they did not occur together. Bioreactors installed at maximum nitrate flux locations (53% of the total channel length) on the western bank removed nitrate-N entering the channel at 62.0 kg N yr⁻¹ (170 g N d⁻¹), achieving 85% of nitrate-N removal of whole-length bioreactors for the re-meandering scenario. Bioreactors installed at maximum groundwater flux locations on the western bank along approximately 40% of the re-meandering channel achieved about 65% of nitrate removal of whole-length bioreactors. Placing bioreactors at maximum nitrate flux locations improved denitrification efficiency. Due to low groundwater velocities, bioreactor nitrate-N removal was found to be nitrate limited for all scenarios.en_US
dc.description.sponsorshipThis work was carried out under support of NOAA Sectoral Applications Research Program grant NA10OAR4310220 and NSF grants CBET 0854307 and CBET 1058038. Simulations were conducted using TARA, a UMBC high-performance computing facility supported by NSF grants CNS-0821258 and DMS-0821311. The authors thank the Associate Editor and two anonymous reviewers for their constructive comments.en_US
dc.description.urihttps://dl.sciencesocieties.org/publications/jeq/articles/45/3/839en_US
dc.format.extent8 pagesen_US
dc.genrejournal articleen_US
dc.identifierdoi:10.13016/M26970224
dc.identifier.citationCui, Z., C. Welty, A.J. Gold. P. Groffman, S. Kaushal, A.J. Miller. Use of a three-dimensional reactive solute transport model for evaluation of bioreactor placement in channel restoration, Journal of Environmental Quality,45 (3), 2016, doi:10.2134/jeq2015.06.0330en_US
dc.identifier.uri10.2134/jeq2015.06.0330
dc.identifier.urihttp://hdl.handle.net/11603/11347
dc.language.isoen_USen_US
dc.publisherAlliance of Crop, Soil, and Environmental Science Societiesen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Urban and Environmental Research and Education
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Geography and Environmental Systems Department
dc.relation.ispartofUMBC Chemical, Biochemical & Environmental Engineering Department
dc.rightsThis item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
dc.subjectnitratesen_US
dc.subjectgroundwateren_US
dc.subjectUMBC High Performance Computing Facility (HPCF)en_US
dc.subject3D reactive transport model
dc.subjectsubsurface bioreactor placement
dc.subjectNitrate-N removal rates
dc.subject.otherthree-dimensional groundwater flow and multispecies reactive transport model
dc.subject.otherplacement of bioreactors in the subsurface to achieve maximum removal of nitrate along restored stream reaches
dc.subject.otherstep-pool hypothetical stream restoration scenario
dc.subject.otherchannel re-meandering hypothetical steam restoration scenario
dc.titleUse of a Three-Dimensional Reactive Solute Transport Model for Evaluation of Bioreactor Placement in Stream Restorationen_US
dc.typeTexten_US

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