Improvement and comparative assessment of a hydrological modelling approach on 20 catchments of various sizes under different climate conditions |
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| Authors: | C Gaba E Alamou A Afouda B Diekkrüger |
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| Institution: | 1. West African Science Service Centre on Climate Change and Adapted Land Use, GRP Water Resources, Abomey-Calavi, Benin;2. Laboratory of Applied Hydrology, Faculty of Science and Techniques, University of Abomey-Calavi, Abomey-Calavi, Benin;3. Laboratory of Applied Hydrology, Faculty of Science and Techniques, University of Abomey-Calavi, Abomey-Calavi, Benin;4. Department of Geography, University of Bonn, Bonn, Germany |
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| Abstract: | Assessing water resources is an important issue, especially in the context of climatic changes. Although numerous hydrological models exist, new approaches are still under investigation. In this context, we propose a modelling approach based on the physical principle of least action. We present new hypotheses to develop the model further, to widen its application. The improved version of the model MODHYPMA was applied on 20 sub-catchments in Africa and the USA. Its performance was compared with two well-known lumped conceptual models, GR4J and HBV. The model could be successfully calibrated and validated. In calibration, GR4J performed better, while other models had similar performance. In validation, MODHYPMA and GR4J performed similarly and better than HBV. The parameter λ has medium sensitivity while parameters λ and TX have low sensitivity. The parameter uncertainty for MODHYPMA, analysed using the GLUE methodology, was higher during high flows but with good p and r factors. EDITOR D. Koutsoyiannis ASSOCIATE EDITOR not assigned |
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| Keywords: | rainfall–runoff modelling least action principle uncertainties stochastic differential equations climate change |
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