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www.hydrol-earth-syst-sci-discuss.net/6/5603/2009/
doi:10.5194/hessd-6-5603-2009
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Technical Note: Linking soil – and stream-water chemistry based on a riparian flow-concentration integration model
1Dept. of Geography, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
2Dept. of Physical Geography and Quaternary Geology, Stockholm University, 10691 Stockholm, Sweden
3Dept. of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), Box 7050, 75007 Uppsala, Sweden
4Dept. of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
Abstract. The riparian zone, the last few meters of soil through which water flows before entering the stream, has been identified as a first order control on key aspects of stream water chemistry dynamics. We propose that the vertical distribution of lateral water flow across the 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 water fluxes and soil water chemistry provides a plausible explanation for observed stream-water-chemistry variations 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.
Discussion Paper (PDF, 736 KB) Interactive Discussion (Closed, 9 Comments) Final Revised Paper (HESS)
Citation: Seibert, J., Grabs, T., Köhler, S., Laudon, H., Winterdahl, M., and Bishop, K.: Technical Note: Linking soil – and stream-water chemistry based on a riparian flow-concentration integration model, Hydrol. Earth Syst. Sci. Discuss., 6, 5603-5629, doi:10.5194/hessd-6-5603-2009, 2009. Bibtex EndNote Reference Manager XML
