Impacts of Retrogressive Thaw Slumps on the Geochemistry of Permafrost Catchments, Stony Creek Watershed, NWT

FieldValue
dc.contributor.authorMalone, Laura
dc.date.accessioned2013-05-08T21:20:34Z
dc.date.available2013-05-08T21:20:34Z
dc.date.created2013
dc.date.issued2013
dc.identifier.urihttp://hdl.handle.net/10393/24129
dc.identifier.urihttp://dx.doi.org/10.20381/ruor-2997
dc.description.abstractRetrogressive thaw slumps are one of the most dramatic thermokarst landforms in periglacial regions. This thesis investigates the impacts of two of the largest hillslope thaw slumps on the geochemistry of periglacial streams on the Peel Plateau, Northwest Territories. It aims to describe the inorganic geochemistry of runoff across active mega-slumps, impacted and pristine tundra streams, as well as that of the ice-rich permafrost exposed in the slump headwalls. Slump runoff is characterized by elevated suspended sediments (911 g/L), high conductivity (2700 µS/cm), and high SO42- ( up to 2078 ppm). The runoff originates as a solute-rich meltwater near the slump headwall, and leaches and re-dissolves soluble salts (e.g., gypsum) as it flows along the mudflow. Conductivity increases until the runoff mixes with pristine tundra streams, diluting the slump runoff signal. SO42-/Cl- is used as a tracer to isolate the slump runoff signal in impacted waters, and suggests that the contribution of slump runoff to the Peel River has been increasing since the 1960s.
dc.language.isoen
dc.publisherUniversité d'Ottawa / University of Ottawa
dc.subjectretrogressive thaw slump
dc.subjectperiglacial streams
dc.subjectgeochemistry
dc.subjectRichardson Mountains
dc.titleImpacts of Retrogressive Thaw Slumps on the Geochemistry of Permafrost Catchments, Stony Creek Watershed, NWT
dc.typeThesis
dc.faculty.departmentSciences de la terre / Earth Sciences
dc.contributor.supervisorClark, Ian
dc.contributor.supervisorLacelle, Denis
dc.embargo.termsimmediate
dc.degree.nameMSc
dc.degree.levelmasters
dc.degree.disciplineSciences / Science
thesis.degree.nameMSc
thesis.degree.levelMasters
thesis.degree.disciplineSciences / Science
uottawa.departmentSciences de la terre / Earth Sciences
CollectionThèses, 2011 - // Theses, 2011 -

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