Arctic Hyporheic Zone Hydrology and Biogeochemistry
Title:Will climate change affect hyporheic processes in arctic
streams? An assessment of interactions among geomorphology, hydrology,
and biogeochemistry in Arctic stream networks Project Duration: 1-Aug-2003 - 31-Jul-2006 Investigators: Breck Bowden (University of
Vermont) John Bradford (Boise State
University) Michael Gooseff (Penn
State University) Jim McNamara
(Boise State University)
are investigating the responses of arctic tundra stream geomorphology,
hyporheic zone hydrology, and biogeochemical cycling to climate change.
In particular, we expect that hyporehic exchange dynamics in tundra
streams are controlled by 1) channel features (pools, riffles, etc.),
and 2) depth of thaw beneath the stream channel. Altered arctic climate
will likely alter stream flows and therefore the fluvial geomorphic
structure of stream channels. We hypothesize that the potential for
hyporheic exchange increases as the climate warms and active layers
deepen. At the same time, increased exchange of water between the
stream and the hyporheic zone could be driving more or different types
of hyporheic biogeochemical cycling, which may alter stream nutrient
Overview of this project within Arctic System Science,
larger forcing factors, and other Arctic hydrologic research.
1. Select and characterize stream reaches that represent the range of
geomorphologic conditions in rivers of the North Slope.
Monitor the sub-stream thaw bulb size through the thaw season using
ground penetrating radar and subsurface temperature measurement in
several stream cross-sections within each reach.
Conduct repeated hyporheic exchange studies (stream solute addition
experiments) through the thaw season in each reach to determine
hyporheic hydraulic characteristics.
Conduct repeated measures of nutrient (N and P) concentrations and
turnover time in the hyporheic zone through the thaw season in each
reach to determine biogeochemical characteristics.
Greenwald, M, W Bowden, J Zarnetske, M Gooseff, J McNamara, J Bradford,
and T Brosten. 2006. Hyporheic Exchange and Biogeochemical Processes in
Arctic Tundra Streams: A Comparison of Two Geomorphically Distinct
Streams. LTER All Scientists Meeting, Estes Park, CO. [poster]
JP. 2006. Headwater hyporheic zones in a warming Arctic
climate: An assessment of hyporheic dynamics across distinct geomorphic
and permafrost conditions. MS Thesis, Department of Aquatic,
Watershed, and Earth Resources, Utah State University.
M.J. 2007. Hyporheic exchange and biogeochemical processing in arctic
tundra streams. MS Thesis, Rubenstein School of the Environment and
Natural Resources, University of Vermont.
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This project is
funded through the National Science Foundation's Office of Polar
material is based upon work supported by the National Science
Foundation under Grant No. 0327440. Any opinions, findings, and
conclusions or recommendations expressed in this material are those of
the author(s) and do not necessarily reflect the views of the National
page was created on 27-Jul-2003.
This page was last updated on 20-Jul-2009.