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| Titel |
Curvature distribution within hillslopes and catchments and its effect on the hydrological response |
| VerfasserIn |
P. W. Bogaart, P. A. Troch |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2006-12-06), S.925-936 |
| Datensatznummer |
250008293
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| Publikation (Nr.) |
 copernicus.org/hess-10-925-2006.pdf |
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| Zusammenfassung |
| Topographic convergence and divergence are first order controls on
the hillslope and catchment hydrological response, as evidenced by
similarity parameter analyses. Hydrological models often do not
take convergence as measured by contour curvature directly into
account; instead they use comparable measures like the topographic
index, or the hillslope width function. This paper focuses on the
question how hillslope width functions and contour curvature are
related within the Plynlimon catchments, Wales. It is shown that
the total width function of all hillslopes combined suggest that
the catchments are divergent in overall shape, which is in
contrast to the perception that catchments should be overall
convergent. This so-called convergence paradox is explained by the
effect of skewed curvature distributions and extreme curvatures
near the channel network. The hillslope-storage Bossiness (hsB)
model is used to asses the effect of within-hillslope convergence
variability on the hydrological response. It is concluded that
this effect is small, even when the soil saturation threshold is
exceeded. Also described in this paper is a novel algorithm to
compute flow path lengths on hillslopes towards the drainage
network, using the multidirectional flow redistribution method. |
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