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| Titel |
Scale effects on the hydrological impact of upland afforestation and drainage using indices of flow variability: the River Irthing, England |
| VerfasserIn |
D. Archer |
| 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 ; 7, no. 3 ; Nr. 7, no. 3, S.325-338 |
| Datensatznummer |
250004635
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| Publikation (Nr.) |
 copernicus.org/hess-7-325-2003.pdf |
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| Zusammenfassung |
| Frequent assertions by river users that rivers in northern England now rise and
fall more quickly than in the past, have never been validated by analysis on catchments of
more than 10 km2. The method using indices of flow variability provides a basis
for making direct measurements of the annual number and duration of pulses, i.e. rises
above a given flow, and for comparing catchments of different sizes. A comparison is made
between the small afforested headwater Coalburn catchment (1.5 km2) and the
larger River Irthing catchment (335 km2) on which the afforested area comprises
19%. A simple but effective means is provided for decoupling the effect of climatic
variability from the effects of land use. The analysis shows that major changes have
occurred on the small catchment, first with rising pulse numbers after pre-afforestation
drainage, then with a much greater progressive decrease in pulse number accompanied with
increasing pulse duration. In contrast, the larger catchment shows little change in
variability indices from the beginning of its record in 1968 until the late 1980s after
which the pattern of change mirrors that at Coalburn but the proportional change is much
smaller. The direction of change is the opposite of that asserted by river users.
Keywords: hydrology, flow variability, land-use impacts, forests, scale effects |
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