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Linking soil- and stream-water chemistry based on a Riparian Flow-Concentration Integration Model
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
Department of Aqautic Sciences and Assessment, Swedish University of Agricultural Sciences.
Department of Forest Ecology and Management,Swedish University of Agricultural Sciences.
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2009 (English)In: Hydrology and earth system sciences, ISSN 1607-7938, Vol. 13, no 12, 2287-2297 p.Article in journal (Refereed) Published
Abstract [en]

The riparian zone, the last few metres of soil through which water flows before entering a gaining stream, has been identified as a first order control on key aspects of stream water chemistry dynamics. We propose that the distribution of lateral flow of water across the vertical profile of soil water chemistry in the riparian zone provides a conceptual explanation of how this control functions in catchments where matrix flow predominates. This paper presents a mathematical implementation of this concept as well as the model assumptions. We also present an analytical solution, which provides a physical basis for the commonly used power-law flow-load equation. This approach quantifies the concept of riparian control on stream-water chemistry providing a basis for testing the concept of riparian control. By backward calculation of soil-water-chemistry profiles, and comparing those with observed profiles we demonstrate that the simple juxtaposition of the vertical profiles of water flux and soil water chemistry provides a plausible explanation for observed variations in stream water chemistry of several major stream components such as Total Organic Carbon (TOC), magnesium, calcium and chloride. The "static" implementation of the model structure presented here provides a basis for further development to account for seasonal influences and hydrological hysteresis in the representation of hyporheic, riparian, and hillslope processes.

Place, publisher, year, edition, pages
Copernicus Publications , 2009. Vol. 13, no 12, 2287-2297 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-32026ISI: 000273059900002ISBN: 1027-5606OAI: diva2:279234
Available from: 2009-12-07 Created: 2009-12-02 Last updated: 2010-09-15Bibliographically approved
In thesis
1. Water quality modeling based on landscape analysis: importance of riparian hydrology
Open this publication in new window or tab >>Water quality modeling based on landscape analysis: importance of riparian hydrology
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Several studies in high-latitude catchments have demonstrated the importance of near-stream riparian zones as hydrogeochemical hotspots with a substantial influence on stream chemistry. An adequate representation of the spatial variability of riparian-zone processes and characteristics is the key for modeling spatio-temporal variations of stream-water quality. This thesis contributes to current knowledge by refining landscape-analysis techniques to describe riparian zones and by introducing a conceptual framework to quantify solute exports from riparian zones. The utility of the suggested concepts is evaluated based on an extensive set of hydrometric and chemical data comprising measurements of streamflow, groundwater levels, soil-water chemistry and stream chemistry.

Standard routines to analyze digital elevation models that are offered by current geographical information systems have been of very limited use for deriving hydrologically meaningful terrain indices for riparian zones. A model-based approach for hydrological landscape analysis is outlined, which, by explicitly simulating groundwater levels, allows better predictions of saturated areas compared to standard routines. Moreover, a novel algorithm is presented for distinguishing between left and right stream sides, which is a fundamental prerequisite for characterizing riparian zones through landscape analysis. The new algorithm was used to derive terrain indices from a high-resolution LiDAR digital elevation model. By combining these terrain indices with detailed hydrogeochemical measurements from a riparian observatory, it was possible to upscale the measured attributes and to subsequently characterize the variation of total organic-carbon exports from riparian zones in a boreal catchment in Northern Sweden. Riparian zones were recognized as highly heterogeneous landscape elements. Organic-rich riparian zones were found to be hotspots influencing temporal trends in stream-water organic carbon while spatial variations of organic carbon in streams were attributed to the arrangement of organic-poor and organic-rich riparian zones along the streams. These insights were integrated into a parsimonious modeling approach. An analytical solution of the model equations is presented, which provides a physical basis for commonly used power-law streamflow-load relations.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2010. 39 p.
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 24
Water quality model, terrain analysis, geographical information system GIS, riparian zone, total organic carbon TOC, boreal catchments
National Category
Oceanography, Hydrology, Water Resources
Research subject
Physical Geography
urn:nbn:se:su:diva-42729 (URN)978-91-7447-135-9 (ISBN)
Public defence
2010-10-18, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Swedish Research Council (VR, grant no. 2005-4289)
At the time of doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: In press; Paper 4: Manuscript.Available from: 2010-09-24 Created: 2010-09-13 Last updated: 2010-09-27Bibliographically approved

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