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| Titel |
Rainfall-runoff modelling in a catchment with a complex groundwater flow system: application of the Representative Elementary Watershed (REW) approach |
| VerfasserIn |
G. P. Zhang, H. H. G. Savenije |
| 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 ; 9, no. 3 ; Nr. 9, no. 3 (2005-09-21), S.243-261 |
| Datensatznummer |
250006868
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| Publikation (Nr.) |
 copernicus.org/hess-9-243-2005.pdf |
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| Zusammenfassung |
| Based on the Representative Elementary Watershed (REW) approach, the
modelling tool REWASH (Representative Elementary WAterShed Hydrology) has been developed
and applied to the Geer river basin. REWASH is deterministic, semi-distributed,
physically based and can be directly applied to the watershed scale. In
applying REWASH, the river basin is divided into a number of sub-watersheds, so
called REWs, according to the Strahler order of the river network. REWASH
describes the dominant hydrological processes, i.e. subsurface flow in the
unsaturated and saturated domains, and overland flow by the
saturation-excess and infiltration-excess mechanisms. The coupling of
surface and subsurface flow processes in the numerical model is realised by
simultaneous computation of flux exchanges between surface and subsurface
domains for each REW. REWASH is a parsimonious tool for modelling watershed
hydrological response. However, it can be modified to include more
components to simulate specific processes when applied to a specific river
basin where such processes are observed or considered to be dominant. In
this study, we have added a new component to simulate interception using a
simple parametric approach. Interception plays an important role in the
water balance of a watershed although it is often disregarded. In addition,
a refinement for the transpiration in the unsaturated zone has been made.
Finally, an improved approach for simulating saturation overland flow by
relating the variable source area to both the topography and the groundwater
level is presented. The model has been calibrated and verified using a
4-year data set, which has been split into two for calibration and
validation. The model performance has been assessed by multi-criteria
evaluation. This work represents a complete application of the REW approach
to watershed rainfall-runoff modelling in a real watershed. The results
demonstrate that the REW approach provides an alternative blueprint for
physically based hydrological modelling. |
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