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Separation of river network–scale nitrogen removal among the main channel and two transient storage compartments

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dc.contributor.author Stewart, Robert J.
dc.contributor.author Wollheim, Wilfred M.
dc.contributor.author Gooseff, Michael N.
dc.contributor.author Briggs, Martin A.
dc.contributor.author Jacobs, Jennifer M.
dc.contributor.author Peterson, Bruce J.
dc.contributor.author Hopkinson, Charles S.
dc.date.accessioned 2011-09-26T15:39:54Z
dc.date.available 2012-02-28T09:32:41Z
dc.date.issued 2011-08-30
dc.identifier.citation Water Resources Research 47 (2011): W00J10 en_US
dc.identifier.uri http://hdl.handle.net/1912/4833
dc.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): W00J10, doi:10.1029/2010WR009896. en_US
dc.description.abstract Transient storage (TS) zones are important areas of dissolved inorganic nitrogen (DIN) processing in rivers. We assessed sensitivities regarding the relative impact that the main channel (MC), surface TS (STS), and hyporheic TS (HTS) have on network denitrification using a model applied to the Ipswich River in Massachusetts, United States. STS and HTS connectivity and size were parameterized using the results of in situ solute tracer studies in first- through fifth-order reaches. DIN removal was simulated in all compartments for every river grid cell using reactivity derived from Lotic Intersite Nitrogen Experiment (LINX2) studies, hydraulic characteristics, and simulated discharge. Model results suggest that although MC-to-STS connectivity is greater than MC-to-HTS connectivity at the reach scale, at basin scales, there is a high probability of water entering the HTS at some point along its flow path through the river network. Assuming our best empirical estimates of hydraulic parameters and reactivity, the MC, HTS, and STS removed approximately 38%, 21%, and 14% of total DIN inputs during a typical base flow period, respectively. There is considerable uncertainty in many of the parameters, particularly the estimates of reaction rates in the different compartments. Using sensitivity analyses, we found that the size of TS is more important for DIN removal processes than its connectivity with the MC when reactivity is low to moderate, whereas TS connectivity is more important when reaction rates are rapid. Our work suggests a network perspective is needed to understand how connectivity, residence times, and reactivity interact to influence DIN processing in hierarchical river systems. en_US
dc.description.sponsorship This work was supported by the National Science Foundation through DEB- 0614282, BCS-0709685 and the Plum Island Long Term Ecological Research site (NSF OCE-0423565). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2010WR009896
dc.subject Biogeochemistry en_US
dc.subject Denitrification en_US
dc.subject Hydraulics en_US
dc.subject Modeling en_US
dc.subject River network en_US
dc.subject Transient storage en_US
dc.title Separation of river network–scale nitrogen removal among the main channel and two transient storage compartments en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2010WR009896


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