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| Titel |
Scale dependence of the episodic hydrochemical response of nested catchments at Plynlimon |
| VerfasserIn |
H. J. Foster, S. Alexander, T. Locks, H. S. Wheater, M. J. Lees, B. Reynolds |
| 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 ; 1, no. 3 ; Nr. 1, no. 3, S.639-651 |
| Datensatznummer |
250000204
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| Publikation (Nr.) |
 copernicus.org/hess-1-639-1997.pdf |
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| Zusammenfassung |
Previous monitoring of the surface water chemistry
of the forested catchments at Plynlimon has concentrated on weekly measurements. Hence, peak values and details
of the rapid changes in chemistry occurring during events tend to be missed, particularly for
smaller catchments. Knowledge of the detailed hydrochemical response is necessary to predict
effects on stream
ecology and to quantify processes occurring within the catchment. This
information is vital if the likely impacts of changes in landuse and pollutant input on episodic
hydrochemical variations are to be modelled.
A summary of daily and three-hourly chemistry for
the River Severn headwaters at Plynlimon, central Wales is presented. Data are from the summer and autumn of
1995 and the winter and summer of 1996. The effects of antecedent conditions, soiltype, landuse
and groundwater and tributary inflow on stream episodic hydrochemical response are discussed
for a range of spatial scales, including first, second and third order streams. Detailed information
on the chemical changes due to a discrete groundwater inflow into the bed of one stream
shows that, during episodes, its influence on stream chemistry is overridden by that of
event water. A comparison of drainage ditch chemistry with main stream chemistry during storm
events is used to consider the importance of tributary inflow at these times. The contrast in
results between sites is assessed, to evaluate the effects of clearfelling and soil type on
stream event chemistry. |
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