Thermal Evidence for Surface and Subsurface Water Contributions to Baseflow in a High Arctic River

dc.contributor.authorBolduc, Christopheren
dc.contributor.departmentGeographyen
dc.contributor.supervisorLamoureux, Scott F.en
dc.date2015-11-25 20:36:12.681
dc.date.accessioned2015-11-26T16:19:10Z
dc.date.available2015-11-26T16:19:10Z
dc.date.issued2015-11-26
dc.degree.grantorQueen's University at Kingstonen
dc.descriptionThesis (Master, Geography) -- Queen's University, 2015-11-25 20:36:12.681en
dc.description.abstractChanges in river temperatures are caused by thermal energy exchanges at the interface between water and the atmosphere and between water, the streambed, and subsurface water. In permafrost regions, deeper active layer formation due to a warming climate can affect ground and channel bed thermal regimes and subsurface flow pathways. The main hypothesis is that within cold region landscapes, stream inflows into rivers provide relatively warm sources of water, while subsurface sources of water such as soil water contribute relatively cold water sources which alter the thermal and isotopic composition of the river, and as such, downstream temperature measurements can identify these sources in space and time. In this study, river water temperature patterns were used as primary indicators of slope water exchanges along the West River at the Cape Bounty Arctic Watershed Observatory (CBAWO), Melville Island, Nunavut, Canada (75º N, 109º W). Water temperature data was collected through detailed longitudinal surveys along the river during the 2014 recession and baseflow periods to locate surface and subsurface lateral inflows. Limited water stable isotope sampling was also undertaken at fixed stations to determine possible mixing from different water sources. Atmospheric factors and channel snow were found to be the main contributors to thermal variance in the river during the 2014 Summer season, with tributary inflow discharge also being a strong factor. The longitudinal temperature profiles indicate clear localized downstream changes in the thermal conditions of the river at multiple locations, and are interpreted to be indicative of subsurface and surface water exchange through inputs of cooler or warmer water. River temperature increased downstream and stable isotopic composition show progressive downstream enrichment in the two study reaches during the majority of the baseflow period, which is indicative of a culmination of localized surface flow inputs along both reaches. These results demonstrate some key processes that influence the thermal regime of a High Arctic river and will contribute to a greater understanding of how surface, subsurface and other water exchanges influence stream hydrology, ecology and biogeochemistry.en
dc.description.degreeM.Sc.en
dc.identifier.urihttp://hdl.handle.net/1974/13841
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsCreative Commons - Attribution - CC BYen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectSurface flowen
dc.subjectSubsurface flowen
dc.subjectArcticen
dc.subjectBaseflowen
dc.subjectHydrologyen
dc.subjectCanadianen
dc.subjectThermal evidenceen
dc.subjectThermal regimeen
dc.subjectCape Bountyen
dc.subjectLongitudinal surveyen
dc.subjectChannel snowen
dc.subjectLateral inflowen
dc.subjectTemperatureen
dc.subjectIsotopeen
dc.subjectDeuteriumen
dc.subjectEnrichmenten
dc.subjectDischargeen
dc.subjectDepletionen
dc.subjectHeat exchangeen
dc.titleThermal Evidence for Surface and Subsurface Water Contributions to Baseflow in a High Arctic Riveren
dc.typethesisen
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Bolduc_Christopher_201511_MSc.pdf
Size:
5.44 MB
Format:
Adobe Portable Document Format