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Modelling retention of sorbing solutes in streams based on tracer experiment using 51Cr
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
1998 (English)In: Journal of environmental engineering, ISSN 0733-9372, E-ISSN 1943-7870, Vol. 124, no 2, 122-130 p.Article in journal (Refereed) Published
Abstract [en]

The transport and retention of a sorbing solute in streams are affected by the transversal uptake in various hyporheic zones, each characterized by its individual turnover time. The uptake is included in a one-dimensional model for the along-stream transport on the form of first-order transfer functions by parameterizing physically derived relationships. A 51Cr(III) tracer experiment, conducted in a brook in an agricultural watershed in Sweden, provided a basis for deducing constitutive equations for three different exchange rates governing the retention of the sorbing solute in the brook. The solute exchange that occurs between the main stream channel and slowly recirculating zones, like side pockets along the stream, eddy zones behind boulders, or side pockets, is practically instantaneous and is manifested as a marked retardation of the pulse propagation in relation to the main stream velocity. The considerably slower exchange with permanent substratum, including armored bed sections, dense vegetation, or adjacent wetland, causes a reduction of the peak concentration and prolonged tails of the breakthroughs. Uptake in the alluvial sediment occurs both in particulate and dissolved phases of the solute, and is affected by the bed dynamics. The uptake in the alluvium was evaluated separately by fitting of an analytical solution of the vertical concentration profile to measured concentration profiles in the sediment. In the experimentally investigated reach, the exchange with the fine bed sediment was dominated by the dissolved phase of Cr, due to advection driven by pressure variabilities along the bed surface.

Place, publisher, year, edition, pages
1998. Vol. 124, no 2, 122-130 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-89681DOI: 10.1061/(ASCE)0733-9372(1998)124:2(122)OAI: oai:DiVA.org:uu-89681DiVA: diva2:161362
Available from: 2002-02-28 Created: 2002-02-28 Last updated: 2017-12-14Bibliographically approved
In thesis
1. On Distribution Coefficients in Aquatic Systems
Open this publication in new window or tab >>On Distribution Coefficients in Aquatic Systems
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, different types of chemical and physical distribution coefficients are identified, examined and used to describe the fate and transport pathways of substances in aquatic systems.

Observations from field experiments in streams with non-reactive and reactive tracers constituted the basis for development of an advection-dispersion model. Differences in the concentrations in both the water and sediment data for the tracers were due to the particle affinity of the reactive tracer. This difference in behaviour could be described by including an instantanous and a kinetically controlled sorption, which included distribution coefficients, in the water column (Kd) and in the streambed sediment (KB), respectively.

The results presented in this thesis also include a model for the lake characteristic concentration of suspended particulate matter (SPM). The SPM-model can be used to describe mass flows of particles in lakes. The traditional distribution (or partition) coefficient Kd has been found to be unsuitable for interpretations of the particle association of solutes and also for distributing solute mass flows. Instead, the particulate or the dissolved fraction, PF and DF, defined as ratios of the particulate or dissolved concentration to the total concentration respectively, is recommended for mass-balance calculations. A new PF-model for phosphorus has meant that this part is no longer the most sensitive part of predicting concentrations of phosphorus in lakes using a more extensive dynamic model.

New methods have also been developed to describe the shape of lakes. Together with the mixing depth of lakes, the shape of a lake can be transformed into a distribution coefficient that physically determines the portion of a lake that is exposed, both areally and vertically, to continuously mixing.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 20 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 687
Keyword
Earth sciences, Distribution coefficient, lake, modelling, morphometry, stream, Geovetenskap
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Environmental Analysis
Identifiers
urn:nbn:se:uu:diva-1777 (URN)91-554-5245-0 (ISBN)
Public defence
2002-03-22, Axel Hambergsalen, Uppsala, 10:15
Opponent
Available from: 2002-02-28 Created: 2002-02-28 Last updated: 2015-09-14Bibliographically approved

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