 |
| Titel |
Improvement, calibration and validation of a distributed hydrological model over France |
| VerfasserIn |
P. Quintana Seguí, E. Martin, F. Habets, J. Noilhan |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 13, no. 2 ; Nr. 13, no. 2 (2009-02-18), S.163-181 |
| Datensatznummer |
250011759
|
| Publikation (Nr.) |
 copernicus.org/hess-13-163-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| The hydrometeorological model SAFRAN-ISBA-MODCOU (SIM) computes water and
energy budgets on the land surface and riverflows and the level of several
aquifers at the scale of France. SIM is composed of a meteorological
analysis system (SAFRAN), a land surface model (ISBA), and a
hydrogeological model (MODCOU). In this study, an exponential profile of
hydraulic conductivity at saturation is introduced to the model and its
impact analysed. It is also studied how calibration modifies the
performance of the model. A very simple method of calibration is
implemented and applied to the parameters of hydraulic conductivity and
subgrid runoff. The study shows that a better description of the hydraulic
conductivity of the soil is important to simulate more realistic
discharges. It also shows that the calibrated model is more robust than
the original SIM. In fact, the calibration mainly affects the processes
related to the dynamics of the flow (drainage and runoff), and the rest of
relevant processes (like evaporation) remain stable. It is also proven
that it is only worth introducing the new empirical parameterization of
hydraulic conductivity if it is accompanied by a calibration of its
parameters, otherwise the simulations can be degraded. In conclusion, it
is shown that the new parameterization is necessary to obtain good
simulations. Calibration is a tool that must be used to improve the
performance of distributed models like SIM that have some empirical
parameters. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|