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| Titel |
Hydrological hysteresis and its value for assessing process consistency in catchment conceptual models |
| VerfasserIn |
O. Fovet, L. Ruiz, M. Hrachowitz, M. Faucheux, C. Gascuel-Odoux |
| 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 ; 19, no. 1 ; Nr. 19, no. 1 (2015-01-07), S.105-123 |
| Datensatznummer |
250120583
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| Publikation (Nr.) |
 copernicus.org/hess-19-105-2015.pdf |
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| Zusammenfassung |
While most hydrological models reproduce the general flow dynamics, they
frequently fail to adequately mimic system-internal processes. In
particular, the relationship between storage and discharge, which often
follows annual hysteretic patterns in shallow hard-rock aquifers, is rarely
considered in modelling studies. One main reason is that catchment storage
is difficult to measure, and another one is that objective functions are
usually based on individual variables time series (e.g. the discharge). This
reduces the ability of classical procedures to assess the relevance of the
conceptual hypotheses associated with models.
We analysed the annual hysteric patterns observed between stream flow and
water storage both in the saturated and unsaturated zones of the hillslope
and the riparian zone of a headwater catchment in French Brittany (Environmental Research Observatory ERO AgrHys (ORE
AgrHys)). The saturated-zone storage was estimated using distributed shallow
groundwater levels and the unsaturated-zone storage using several moisture
profiles. All hysteretic loops were characterized by a hysteresis index.
Four conceptual models, previously calibrated and evaluated for the same
catchment, were assessed with respect to their ability to reproduce the
hysteretic patterns.
The observed relationship between stream flow and saturated, and unsaturated
storages led us to identify four hydrological periods and emphasized a clearly
distinct behaviour between riparian and hillslope groundwaters. Although all
the tested models were able to produce an annual hysteresis loop between
discharge and both saturated and unsaturated storage, the integration of a
riparian component led to overall improved hysteretic signatures, even if
some misrepresentation remained. Such a system-like approach is likely to
improve model selection. |
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