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| Titel |
Hydrochemical heterogeneity in an upland catchment: further characterisation of the spatial, temporal and depth variations in soils, streams and groundwaters of the Plynlimon forested catchment, Wales |
| VerfasserIn |
P. Shand, A. H. Haria, C. Neal, K. J. Griffiths, D. C. Gooddy, A. J. Dixon, T. Hill, D. K. Buckley, J. E. Cunningham |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2005-12-31), S.621-644 |
| Datensatznummer |
250007143
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| Publikation (Nr.) |
 copernicus.org/hess-9-621-2005.pdf |
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| Zusammenfassung |
| The heterogeneous nature of upland hard-rock catchments in terms of geology,
geomorphology, superficial deposits, soil type and land use gives rise to a
range of hydrochemical characteristics in stream waters. This is further
complicated by the large and often rapid changes in stream flow typical of
storm events. The sources of solutes and flow pathways in hard-rock
catchments are still poorly understood, in particular the role of bedrock
groundwater. Spatial variations in water chemistry are presented for stream
waters, soils and groundwaters in the forested Plynlimon catchment of Wales,
UK. The results highlight a large degree of spatial heterogeneity in each of
these systems. This has major implications for the application of end-member
mixing analysis and presents serious problems for modelling in scaling up
from study sites to catchment scale. However, such data provide important
constraints on sources, flow pathways and residence times within individual
catchment compartments, knowledge of which is essential for understanding how
such catchments function. The characterisation of sub-surface waters in
upland catchments requires a great deal of care during sampling as well as
high spatial and temporal resolution of sampling, and further work is
required to characterise the Plynlimon catchments fully. Nevertheless, the
presence of an active and highly stratified groundwater system is considered
important as a source of solutes and water to streams. It also provides a
storage medium that is likely to make a major contribution to explaining the
strongly damped rainfall Cl and d2H signals measured in the streams. |
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