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Article
Influence of Morphology and Permafrost Dynamics on Hyporheic Exchange in Arctic Headwater Streams under Warming Climate Conditions
Geophysical Research Letters
  • Jay P. Zarnetske, Utah State University
  • Michael N. Gooseff, Pennsylvania State University
  • W. Breck Bowden, University of Vermont
  • Morgan J. Greenwald, University of Vermont
  • Troy R. Brosten, Boise State University
  • John H. Bradford, Boise State University
  • James P. McNamara, Boise State University
Document Type
Article
Publication Date
1-16-2008
Abstract

We investigated surface-subsurface (hyporheic) exchange in two morphologically distinct arctic headwater streams experiencing warming (thawing) sub-channel conditions. Empirically parameterized and calibrated groundwater flow models were used to assess the influence of sub-channel thaw on hyporheic exchange. Average thaw depths were at least two-fold greater under the higher-energy, alluvial stream than under the lowenergy, peat-lined stream. Alluvial hyporheic exchange had shorter residence times and longer flowpaths that occurred across greater portions of the thawed sediments. For both reaches, the morphologic (longitudinal bed topography) and hydraulic conditions (surface and groundwater flow properties) set the potential for hyporheic flow. Simulations of deeper thaw, as predicted under a warming arctic climate, only influence hyporheic exchange until a threshold depth. This depth is primarily determined by the hydraulic head gradients imposed by the stream morphology. Therefore, arctic hyporheic exchange extent is likely to be independent of greater sub-stream thaw depths.

Copyright Statement

Copyright 2008 by the American Geophysical Union. DOI: 10.1029/2007GL032049

Citation Information
Jay P. Zarnetske, Michael N. Gooseff, W. Breck Bowden, Morgan J. Greenwald, et al.. "Influence of Morphology and Permafrost Dynamics on Hyporheic Exchange in Arctic Headwater Streams under Warming Climate Conditions" Geophysical Research Letters (2008)
Available at: http://works.bepress.com/john_bradford/3/