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| Titel |
Internal evaluation of a physically-based distributed model using data from a Mediterranean mountain catchment |
| VerfasserIn |
S. P. Anderton, J. Latron, S. M. White, P. Llorens, F. Gallart, C. Salvany, P. E. O'Connell |
| 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 ; 6, no. 1 ; Nr. 6, no. 1, S.67-84 |
| Datensatznummer |
250003337
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| Publikation (Nr.) |
 copernicus.org/hess-6-67-2002.pdf |
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| Zusammenfassung |
| An evaluation of the performance of a
physically-based distributed model of a small Mediterranean mountain catchment
is presented. This was carried out using hydrological response data,
including measurements of runoff, soil moisture, phreatic surface level and
actual evapotranspiration. A-priori model parameterisation was based as
far as possible on property data measured in the catchment. Limited model
calibration was required to identify an appropriate value for terms controlling
water loss to a deeper regional aquifer. The model provided good results
for an initial calibration period, when judged in terms of catchment discharge.
However, model performance for runoff declined substantially when evaluated
against a consecutive, rather drier, period of data. Evaluation against other
catchment responses allowed identification of the problems responsible for the
observed lack of model robustness in flow simulation. In particular, it
was shown that an incorrect parameterisation of the soil water model was
preventing adequate representation of drainage from soils during hydrograph
recessions. This excess moisture was then being removed via an
overestimation of evapotranspiration. It also appeared that the model
underestimated canopy interception. The results presented here suggest that
model evaluation against catchment scale variables summarising its water balance
can be of great use in identifying problems with model parameterisation, even
for distributed models. Evaluation using spatially distributed data
yielded less useful information on model performance, owing to the relative
sparseness of data points, and problems of mismatch of scale between the
measurement and the model grid.
Keywords: physically-based distributed model, SHETRAN, parameterisation,
Mediterranean mountain catchment, internal evaluation, multi-response |
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