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| Titel |
A paradigm shift in stormflow predictions for active tectonic regions with large-magnitude storms: generalisation of catchment observations by hydraulic sensitivity analysis and insight into soil-layer evolution |
| VerfasserIn |
Makoto Tani |
| 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 ; 17, no. 11 ; Nr. 17, no. 11 (2013-11-12), S.4453-4470 |
| Datensatznummer |
250085991
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| Publikation (Nr.) |
 copernicus.org/hess-17-4453-2013.pdf |
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| Zusammenfassung |
| In active tectonic regions with large-magnitude storms, it is still difficult to predict
stormflow responses by distributed runoff models from the catchment properties without a
parameter calibration using observational data. This paper represents an attempt to address the
problem. A review of observational studies showed that the stormflow generation
mechanism was heterogeneous and complex, but stormflow responses there were simply
simulated by a single tank with a drainage hole when the stormflow-contribution area was
spatially invariable due to the sufficient amount of rainfall supply. These results suggested
such a quick inflow/outflow waveform transmission was derived from the creation of a
hydraulic continuum under a quasi-steady state. General conditions necessary for the
continuum creation were theoretically examined by a sensitivity analysis for a sloping soil
layer. A new similarity framework using the Richards equation was developed for
specifying the sensitivities of waveform transmission to topographic and soil properties.
The sensitivity analysis showed that saturation-excess overland flow was generally produced
from a soil layer without any macropore effect, whereas the transmission was derived
mainly from the vertical unsaturated flow instead of the downslope flow in a soil layer
with a large drainage capacity originated from the macropore effect. Both were possible for
the quick transmission, but a discussion on the soil-layer evolution process suggested that
an inhibition of the overland flow due to a large drainage capacity played a key role,
because a confinement of the water flow within the soil layer might be needed for the
evolution against strong erosional forces in the geographical regions. The long history of
its evolution may mediate a relationship between simple stormflow responses and complex
catchment properties. As a result, an insight into this evolution process and an inductive
evaluation of the dependences on catchment properties by comparative hydrology are
highly encouraged to predict stormflow responses by distributed runoff models. |
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