Improvement, calibration and validation of a distributed hydrological model over France

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...

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Vydáno v:Hydrology and earth system sciences Ročník 13; číslo 2; s. 163 - 181
Hlavní autoři: Quintana Seguí, P., Martin, E., Habets, F., Noilhan, J.
Médium: Journal Article
Jazyk:angličtina
Vydáno: European Geosciences Union 01.01.2009
Copernicus Publications
Témata:
climate models
Continental interfaces, environment
Earth Sciences
Environmental Sciences
evaporated milk
France
Freshwater
Global Changes
hydraulic conductivity
hydrologic models
infiltration (hydrology)
model validation
Ocean, Atmosphere
runoff
Sciences of the Universe
soil water
watershed hydrology
watersheds
France
ISSN:1607-7938, 1027-5606, 1607-7938
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Shrnutí: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.
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ISSN:1607-7938
1027-5606
1607-7938
DOI:10.5194/hess-13-163-2009