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A geophysical characterization and monitoring strategy for determining controls on groundwater-surface water exchange regulating contaminant transport at the Hanford 300-Area
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Mwakanyamale, Kisa. A geophysical characterization and monitoring strategy for determining controls on groundwater-surface water exchange regulating contaminant transport at the Hanford 300-Area. Retrieved from https://doi.org/doi:10.7282/T38051D8

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TitleA geophysical characterization and monitoring strategy for determining controls on groundwater-surface water exchange regulating contaminant transport at the Hanford 300-Area
NameMwakanyamale, Kisa (author); Slater, Lee D (chair); Elzinga, Evert J (internal member); Ntarlagiannis, Dimitrios (internal member); Day-Lewis, Frederick D (outside member); Rutgers University; Graduate School - Newark
Date Created2012
Other Date2012-10 (degree)
SubjectEnvironmental Science, Groundwater--Pollution, Uranium--Environmental aspects, Pollution--Columbia River
Extentx, 123 p. : ill.
DescriptionThe transport of Uranium contaminated groundwater to the Columbia River in the hyporheic corridor of the U.S. Department of Energy Hanford 300-Area, Richland, Washington, is influenced by the depth and location of the Hanford-Ringold contact. Ringold Formation sediments have distinct physicochemical properties compared to the Hanford Formation sediments through which groundwater flows. Definition of the spatial variability and the depth to the Hanford-Ringold contact across the site is crucial to improve understanding of contaminant transport between the aquifer and the river. This dissertation focuses on the use of geophysical datasets to build a hydrological framework for understanding groundwater-surface water interaction and mixing of Uranium contaminated groundwater with Columbia River. Geophysical data including resistivity, induced polarization (IP) and streambed temperature were collected in the 300-Area. The first part of this dissertation report on the use of resistivity/IP survey to image spatial distribution of the primary lithologic units controlling flow across the site. The Hanford- Ringold contact is clearly identified from the sharp contrast in polarizability between the two units. Variation in the elevation of this contact provides evidence of a depression in the Hanford-Ringold contact connecting the aquifer and the river, likely facilitating flow and transport at the site. Fiber-optic cables were used for distributed temperature sensing (FO-DTS), to monitor real time temperature along the river corridor. It is recognized that groundwater discharge in 300-Area is controlled by fluctuations in the river stage. The second part of this dissertation focuses on time series and time-frequency analysis of FO-DTS and river stage data to better understand the control of river stage on groundwater discharge. Time series analysis of FO-DTS data identified spatial distribution of groundwater discharge zones on the river bed. Time-frequency analysis provides spatial information on the strength of stage-driven discharge of groundwater along the river corridor. The third part of this dissertation addresses the need for a new approach to extract quantitative information from FO-DTS data while providing an assessment of uncertainty associated with this information. A combination of discriminant analysis and spectral analysis is used to quantitatively map zones of enhanced groundwater discharge while providing measures of classification uncertainty.
NotePh.D.
NoteIncludes bibliographical references
NoteIncludes vita
Noteby Kisa Mwakanyamale
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T38051D8
Languageeng
CollectionGraduate School - Newark Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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