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Impacts of retrogressive thaw slumps on the geochemistry of permafrost catchments, Stony Creek Watershed, NWT.

机译:退冻融化坍塌对多年冻土流域地球化学的影响,石溪溪流域,西北地区。

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摘要

Retrogressive 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. SO4 2-/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.
机译:退行性融化坍塌是冰缘地区最引人注目的热喀斯特地貌之一。本文研究了西北地区皮尔高原上两个最大的山坡融化塌陷对冰河沿流地球化学的影响。它的目的是描述整个活动性大塌方,受冲击的原始苔原流以及径直塌陷的顶盖中暴露的富冰多年冻土的径流的无机地球化学。坍塌径流的特征是悬浮沉积物(911 g / L)高,电导率高(2700 µS / cm)和高SO42-(高达2078 ppm)。径流起源于坍落度顶壁附近富含溶质的熔融水,并在沿泥流流动时浸出并重新溶解可溶性盐(例如石膏)。电导率增加,直到径流与原始苔原流混合,稀释坍落径流信号。 SO4 2- / Cl-用作示踪剂来隔离受冲击水域的坍塌径流信号,并表明,自1960年代以来,坍塌径流对皮尔河的贡献一直在增加。

著录项

  • 作者

    Malone, Laura.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Geophysics.;Geochemistry.
  • 学位 M.Sc.
  • 年度 2013
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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