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    Residence time distributions in surface transient storage zones in streams : estimation via signal deconvolution

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    2010WR009959.pdf (675.8Kb)
    Date
    2011-05-11
    Author
    Gooseff, Michael N.  Concept link
    Benson, David A.  Concept link
    Briggs, Martin A.  Concept link
    Weaver, Mitchell  Concept link
    Wollheim, Wilfred M.  Concept link
    Peterson, Bruce J.  Concept link
    Hopkinson, Charles S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4628
    As published
    https://doi.org/10.1029/2010WR009959
    DOI
    10.1029/2010WR009959
    Keyword
     Transient storage; Residence time distributions; Surface transient storage; Mobile-immobile exchange; Stream solute transport 
    Abstract
    Little is known about the impact of surface transient storage (STS) zones on reach-scale transport and the fate of dissolved nutrients in streams. Exchange with these locations may influence the rates of nutrient cycling often observed in whole-stream tracer experiments, particularly because they are sites of organic matter collection and lower flow velocities than those observed in the thalweg. We performed a conservative stream tracer experiment (slug of dissolved NaCl) in the Ipswich River in northeastern Massachusetts and collected solute tracer data both in the thalweg and adjacent STS zones at three locations in a fifth-order reach. Tracer time series observed in STS zones are an aggregate of residence time distributions (RTDs) of the upstream transport to that point (RTDTHAL) and that of the temporary storage within these zones (RTDSTS). Here we demonstrate the separation of these two RTDs to determine the RTDSTS specifically. Total residence times for these individual STS zones range from 4.5 to 7.5 h, suggesting that these zones have the potential to host important biogeochemical transformations in stream systems. All of the RTDSTS show substantial deviations from the ideal prescribed by the two-state (mobile/immobile) mass transfer equations. The deviations indicate a model mismatch and that parameter estimation based on the mass transfer equations will yield misleading values.
    Description
    Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Water Resources Research 47 (2011): W05509, doi:10.1029/2010WR009959.
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    • Ecosystems Center
    Suggested Citation
    Water Resources Research 47 (2011): W05509
     

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