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Soft combination of local models in a multi-objective framework
1Public Research Center – Gabriel Lippmann, Luxembourg
2Water Resources Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, The Netherlands
3UNESCO-IHE Institute for Water Education, Delft, The Netherlands
Abstract. Conceptual hydrologic models are useful tools as they provide an interpretable representation of the hydrologic behaviour of a catchment. Their representation of catchment's hydrological processes and physical characteristics, however, implies simplification of the complexity and heterogeneity of reality. As a result, those models often show a lack of flexibility in reproducing the vast spectrum of catchment responses. Hence, the accuracy in reproducing certain aspects of the system behaviour is often paid in terms of a lack of accuracy in the representation of other aspects.
By acknowledging the structural limitations of those models, a modular approach to hydrological simulation is proposed. Instead of using a single model to reproduce the full range of catchment responses, multiple models are used, each of them assigned to a specific task.
The approach is here demonstrated in the case where the different models are associated with different parameter realizations within a fixed model structure. We show that using a composite "global" model, obtained by a combination of individual "local" models, the accuracy of the simulation is improved. We argue that this approach can be useful because it partially overcomes the structural limitations that a conceptual model might exhibit. The approach is shown in application to the discharge simulation of the experimental Alzette River basin in Luxembourg, with a conceptual model that follows the structure of the HBV model.
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Citation: Fenicia, F., Solomatine, D. P., Savenije, H. H. G., and Matgen, P.: Soft combination of local models in a multi-objective framework, Hydrol. Earth Syst. Sci. Discuss., 4, 91-123, 2007. Bibtex EndNote Reference Manager
