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| Titel |
Using official map data on topography, wetlands and vegetation cover for prediction of stream water chemistry in boreal headwater catchments |
| VerfasserIn |
J.-O. Andersson, L. Nyberg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 13, no. 4 ; Nr. 13, no. 4 (2009-04-27), S.537-549 |
| Datensatznummer |
250011834
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| Publikation (Nr.) |
 copernicus.org/hess-13-537-2009.pdf |
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| Zusammenfassung |
| A large part of the spatial variation of stream water
chemistry can be related to inputs from headwater streams. In order to
understand and analyse the dominant processes taking place in small and
heterogeneous catchments, accurate data with high spatial and temporal
resolution is necessary. In most cases, the quality and resolution of
available map data are considered too poor to be used in environmental
assessments and modelling of headwater stream chemistry. In this study 18
forested catchments (1–4 km2) were selected within a 120×50 km region
in the county of Värmland in western Sweden. The aim was to test if
topographic and vegetation variables derived from official datasets were
correlated to stream water chemistry, primarily the concentration of
dissolved organic carbon (DOC), but also Al, Fe and Si content. GIS was used
to analyse the elevation characteristics, generate topographic indices, and
calculate the percentage of wetlands and a number of vegetation classes. The
results clearly show that topography has a major influence on stream water
chemistry. There were strong correlations between mean slope and percentage
wetland, percentage wetland and DOC, mean slope and DOC, and a very strong
correlation between mean topographic wetness index (TWI) and DOC. The
conclusion was that official topographic data, despite uncertain or of low
quality and resolution, could be useful in the prediction of headwater
DOC-concentration in boreal forested catchments. |
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