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| Titel |
The JGrass-NewAge system for forecasting and managing the hydrological budgets at the basin scale: models of flow generation and propagation/routing |
| VerfasserIn |
G. Formetta, R. Mantilla, S. Franceschi, A. Antonello, R. Rigon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 4, no. 4 ; Nr. 4, no. 4 (2011-11-04), S.943-955 |
| Datensatznummer |
250001914
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| Publikation (Nr.) |
 copernicus.org/gmd-4-943-2011.pdf |
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| Zusammenfassung |
This paper presents a discussion of the predictive capacity of the
implementation of the semi-distributed hydrological modeling system
JGrass-NewAge. This model focuses on the hydrological budgets of medium scale
to large scale basins as the product of the processes at the hillslope scale
with the interplay of the river network. The part of the modeling system
presented here deals with the: (i) estimation of the space-time structure of
precipitation, (ii) estimation of runoff production; (iii) aggregation and
propagation of flows in channel; (v) estimation of evapotranspiration; (vi)
automatic calibration of the discharge with the method of particle swarming.
The system is based on a hillslope-link geometrical partition of the
landscape, combining raster and vectorial treatment of hillslope data with
vector based tracking of flow in channels. Measured precipitation are
spatially interpolated with the use of kriging. Runoff production at each
channel link is estimated through a peculiar application of the Hymod model.
Routing in channels uses an integrated flow equation and produces discharges
at any link end, for any link in the river network. Evapotranspiration is
estimated with an implementation of the Priestley-Taylor equation. The model
system assembly is calibrated using the particle swarming algorithm. A two
year simulation of hourly discharge of the Little Washita (OK, USA) basin is
presented and discussed with the support of some classical indices of
goodness of fit, and analysis of the residuals. A novelty with respect to
traditional hydrological modeling is that each of the elements above,
including the preprocessing and the analysis tools, is implemented as a
software component, built upon Object Modelling System v3 and jgrasstools
prescriptions, that can be cleanly switched in and out at run-time, rather
than at compiling time. The possibility of creating different modeling
products by the connection of modules with or without the calibration tool,
as for instance the case of the present modeling chain, reduces redundancy in
programming, promotes collaborative work, enhances the productivity of
researchers, and facilitates the search for the optimal modeling solution. |
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