{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80930"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80930","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Temperature-Derived Fluxes: Implications of Various Flow Environments and Simplified Geologic Representation on Groundwater-Surface Water Interactions","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Glose, Thomas; 0000-0002-5414-3571"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Lowry, Christopher","Geology"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-10-29T16:48:15Z","date_published":"2019-10-29T16:48:15Z","updated_at":"2026-07-27T19:05:28Z","subjects":["hydrologic sciences"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80930","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lowry, Christopher","Geology"]},{"key":"dc:creator","label":"Author","values":["Glose, Thomas; 0000-0002-5414-3571"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-10-29T16:48:15Z","2019","2019-08-08 17:04:26"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["hydrologic sciences"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80930"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","Fluxes across the groundwater-surface water (GW-SW) interface, while essential for processes such as nutrient cycling, ecological niche support, and providing baseflow to streams, are difficult to conceptualize and measure due to the non-uniform and dynamic nature of their distribution in space and variability through time. There is a need to quantify these fluxes over large spatial extents through extended periods of time, while maintaining a sub-daily or daily record of flux to investigate how the timing, extent, and duration of pivotal GW-SW interaction processes are changing in relation to a changing climate. Heat as an environmental tracer, due to its cost-effective and ubiquitous nature, is a commonly applied method to quantify these fluxes. However, it is unclear if this method, when applied in real world scenarios, is accurate over the wide range of naturally occurring fluxes. This study utilizes numerical modeling to generate synthetic temperature time series data from both idealized and real-world data driven boundary conditions to investigate the accuracy and direct application of periodic temperature time series methods for the quantification of fluxes across the GW-SW interface. Sensor resolution-based thresholds were developed using the Péclet number, the ratio between advective and conductive heat transport. These thresholds are used determine if a flux estimate is accurate and representative of the system or if a secondary, independent flux estimate is needed to verify the temperature derived fluxes. Temperature derived fluxes were then quantified and compared to Darcy’s Law derived fluxes in five rivers at which the United States Geological Survey maintains co-located stream gage stations and riparian groundwater wells. Over the period of five to seven months, it was found that periodic temperature time series methods provided an accurate record of flux when compared to those found using Darcy’s Law for three of the five rivers analyzed. For the two remaining sites, violations to fundamental assumptions such as sudden, drastic changes in hydrologic boundary conditions, and limitations related to temperature sensor resolutions resulted in erroneous flux measurements, indicating that the use of temperature derived fluxes is nuanced and needs to be applied with care. Finally, fluxes across the GW-SW interface are not just the driving force for numerous GW-SW interaction processes, they can also be repurposed to simply the expression of near-surface geologic heterogeneity. As the movement of water through the subsurface is regulated by the hydraulic conductivity of the geologic material, fluxes at the GW-SW interface are an expression of the depth-integrated hydraulic conductivity of the sum total of these small-scale heterogeneities. This simplification of the geologic subsurface was found to be as accurate as traditional hydraulic conductivity when applied to scenarios where the bulk movement of water across the GW-SW interface is of primary importance."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Temperature-Derived Fluxes: Implications of Various Flow Environments and Simplified Geologic Representation on Groundwater-Surface Water Interactions"]}]}],"canonical_facts":{"dc:contributor":["Lowry, Christopher","Geology"],"dc:creator":["Glose, Thomas; 0000-0002-5414-3571"],"dc:date":["2019-10-29T16:48:15Z","2019","2019-08-08 17:04:26"],"dc:description":["Ph.D.","Fluxes across the groundwater-surface water (GW-SW) interface, while essential for processes such as nutrient cycling, ecological niche support, and providing baseflow to streams, are difficult to conceptualize and measure due to the non-uniform and dynamic nature of their distribution in space and variability through time. There is a need to quantify these fluxes over large spatial extents through extended periods of time, while maintaining a sub-daily or daily record of flux to investigate how the timing, extent, and duration of pivotal GW-SW interaction processes are changing in relation to a changing climate. Heat as an environmental tracer, due to its cost-effective and ubiquitous nature, is a commonly applied method to quantify these fluxes. However, it is unclear if this method, when applied in real world scenarios, is accurate over the wide range of naturally occurring fluxes. This study utilizes numerical modeling to generate synthetic temperature time series data from both idealized and real-world data driven boundary conditions to investigate the accuracy and direct application of periodic temperature time series methods for the quantification of fluxes across the GW-SW interface. Sensor resolution-based thresholds were developed using the Péclet number, the ratio between advective and conductive heat transport. These thresholds are used determine if a flux estimate is accurate and representative of the system or if a secondary, independent flux estimate is needed to verify the temperature derived fluxes. Temperature derived fluxes were then quantified and compared to Darcy’s Law derived fluxes in five rivers at which the United States Geological Survey maintains co-located stream gage stations and riparian groundwater wells. Over the period of five to seven months, it was found that periodic temperature time series methods provided an accurate record of flux when compared to those found using Darcy’s Law for three of the five rivers analyzed. For the two remaining sites, violations to fundamental assumptions such as sudden, drastic changes in hydrologic boundary conditions, and limitations related to temperature sensor resolutions resulted in erroneous flux measurements, indicating that the use of temperature derived fluxes is nuanced and needs to be applied with care. Finally, fluxes across the GW-SW interface are not just the driving force for numerous GW-SW interaction processes, they can also be repurposed to simply the expression of near-surface geologic heterogeneity. As the movement of water through the subsurface is regulated by the hydraulic conductivity of the geologic material, fluxes at the GW-SW interface are an expression of the depth-integrated hydraulic conductivity of the sum total of these small-scale heterogeneities. This simplification of the geologic subsurface was found to be as accurate as traditional hydraulic conductivity when applied to scenarios where the bulk movement of water across the GW-SW interface is of primary importance."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80930"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["hydrologic sciences"],"dc:title":["Temperature-Derived Fluxes: Implications of Various Flow Environments and Simplified Geologic Representation on Groundwater-Surface Water Interactions"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:28Z"}