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Hyporheic and Parafluvial Zones in…

The Arctic Tundra!. Hyporheic and Parafluvial Zones in…. The hydraulic characteristics and geochemistry of hyporheic and parafluvial zones in Arctic tundra streams, north slope, Alaska. Edwarson et al. (2003): Advances in Water Resources.

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Hyporheic and Parafluvial Zones in…

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  1. The Arctic Tundra! Hyporheic and Parafluvial Zones in…

  2. The hydraulic characteristics and geochemistry of hyporheic and parafluvial zones in Arctic tundra streams, north slope, Alaska Edwarson et al. (2003): Advances in Water Resources

  3. Purpose: Investigate the hydrologic and chemical dynamics of hyporheic and parafluvial zones in Arctic tundra streams Importance: Essentially no information on Arctic streams • First comprehensive description of hyporheic and parafluvial zones in Arctic tundra streams • Continuous permafrost • Limit the importance of hyporheic processes?

  4. Scope of Work • 17 conservative tracer additions on 7 streams from 1994-1996 • Stream reaches varied greatly • Characterize in-stream hydrologic parameters using hyporheic samplers and OTIS-P simulations • Biogeochemical and nutrient processing in hyporheic and parafluvial zones

  5. Background: Definitions and Key Concepts • Transient storage zones • Parafluvial • Beaded stream • Importance of hyporheic and parafluvial zones • 3 key factors that control water movement in these zones • DO in the hyporheic zone • Modeling limitations

  6. Study Area

  7. Study Area: Kuparuk R. and Oksrukuyik Cr. fertilized Kupa Kupa Mouth Of Kupa Oks

  8. Whole Lotta Methods: • Hyporheic Samplers • Tracer Additions • Conservative Tracer Analysis • Solute Modeling • Vertical Hydraulic Gradient (VHG) • Nutrient Chemistry http://pubs.usgs.gov/sir/2005/5255/section4.html http://water.usgs.gov/ogw/gwrp/images/photos/rhodamineWT_injection.jpg

  9. Results: OTIS Modeling • No significant relationship between As/A and discharge • General relationship held true • Average storage zone cross-sectional area of the Arctic streams • 43% (Range: 8 – 254%) • 32% (Range: 8 – 112%) without Imnavait Cr.

  10. Results:Channel, Upwelling, and Downwelling Sites Transient Storage Zones

  11. Top of Riffle Bottom of Riffle Results: Channel, Upwelling, and Downwelling Sites Parafluvial Tracer Penetration Hyporheic Hyporheic Parafluvial

  12. Results: Channel, Upwelling, and Downwelling Sites Water Quality

  13. Results: VHG and Temperature VHG Parafluvial zones in left and right point bars Riffle

  14. Results: Benthic Uptake

  15. Key Discussion Points and Conclusions • Transient storage in Arctic Streams • Similarity to temperate regions • As/A relationship not signifcant • Δmorphology and Δstage height are boss. • Importance of eddies • BUT hyporheic storage still muy importante! • Biogeochemical importance of hyporheic flowpath.

  16. Key Discussion Points and Conclusions • Permafrost • Hyporheic flow not limited by permafrost in ice-free season • Spring ice-out (thaw) may results in much lower As/A values due to high snow-melt Q and reduced interstitial area • Water Quality • Interstitial waters served as sources of NO3, NH4, PO4, and CO2 • Interstitial temperature inversely related to VHG and residence time in hyporheic and parafluvial zones.

  17. Questions? NO QUESTIONS

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