Watershed-estuary dynamics in the mobile river watershed-mobile bay estuary (mr-mb) continuum examined by combined geochemical and satellite approaches

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dc.contributor Cohen, Sagy
dc.contributor Elliott, Emily
dc.contributor Nearing, Grey
dc.contributor.advisor Dimova, Natasha T.
dc.contributor.author Stewart, Jackson Buford
dc.date.accessioned 2021-05-12T16:28:25Z
dc.date.available 2021-05-12T16:28:25Z
dc.date.issued 2020-12
dc.identifier.other u0015_0000001_0003728
dc.identifier.other Stewart_alatus_0004M_14367
dc.identifier.uri http://ir.ua.edu/handle/123456789/7671
dc.description Electronic Thesis or Dissertation
dc.description.abstract The Mobile River System acts as a vital economic, social, and cultural center for Alabama and the northern Gulf of Mexico region. With increasing levels of urbanization and land-use and development, the ecological integrity of this system becomes more vulnerable to imbalance due to pollution, anthropogenic alteration of stream course, and other land-use activities. This study focuses on tracking suspended sediment material transported by the Mobile River System, from upstream origin of erosion through the Mobile Estuary, and into Mobile Bay, by combining established geochemical and remote sensing methods and approaches. To accomplish this, I posed three research questions, (Q1) where in the upper reaches of the system are the suspended particulates originating? (Q2) what is the magnitude of flux for suspended sediment (SS) and associated major and trace metals from the river system? and (Q3) can the distribution of the suspended sediment material be effectively tracked within the Mobile Bay basin? The origin of sediment, i.e. identifying sources from the two major tributaries of the Mobile River, the Alabama and the Tombigbee Rivers (Q1) was determined using geochemical fingerprinting of radioisotopes and trace metals. The concatenation of fingerprinting properties of each tributary and of downstream suspended sediments in a geochemical mixing model resulted in 61% of suspended sediment material originating from the Tombigbee Basin, and 39% from the Alabama Basin. The flux of material out of the river system into Mobile Bay (Q2) was determined through compositional analysis of suspended sediment material collected by passive suspended sediment capture within the Mobile-Tensaw Delta. Using this sampling approach, SS flux entering the Delta varied between 981 g/s during low flow regime and 23,509 g/s during high flow. Associated trace metal fluxes were below EPA regulated limits. (Q3) Calibration of existing remote sensing algorithms with in-situ data from Mobile Bay proved successful in generating remote sensing algorithms which can track sediment movement in Mobile Bay across seasonal and hydrologic conditions.
dc.format.extent 108 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Marine geology
dc.subject.other Remote sensing
dc.subject.other Water resources management
dc.title Watershed-estuary dynamics in the mobile river watershed-mobile bay estuary (mr-mb) continuum examined by combined geochemical and satellite approaches
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Department of Geological Sciencess
etdms.degree.discipline Geology
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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