Reducing uncertainty in the calibration and validation of the INCA-N model by using soft data
| Autor: | François Birgand, Katri Rankinen, J. Randall Etheridge, Michael R. Burchell, Ahti Lepistö, Kirsti Granlund |
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| Rok vydání: | 2013 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category Calibration and validation Calibration (statistics) ta1172 ta1171 Drainage basin Model parameters 15. Life on land 6. Clean water Model validation chemistry.chemical_compound Nitrate chemistry 13. Climate action Environmental science Soft data Water Science and Technology |
| Zdroj: | Hydrology Research. 45:73-88 |
| ISSN: | 2224-7955 0029-1277 |
| DOI: | 10.2166/nh.2013.039 |
| Popis: | Process-based nutrient models are increasingly used to determine the impact of future changes in land use, agriculture production practices and climate on the quantity and timing of nutrients reaching surface waters. Calibration of catchment-scale models to observed conditions can be difficult due to parameter uncertainty and the heterogeneity of catchment processes. Soft data, i.e. knowledge of processes gained through experimentation, have been suggested as one method of reducing uncertainty and producing a more accurate model of the processes that occur in a catchment. In this work, the Integrated Catchment model for Nitrogen was calibrated and validated for the Yläneenjoki catchment in south-western Finland by incorporating soft data. The calibration for 2003–2008 produced an adequate model of the in-stream nitrate concentrations (R2 = 0.45, NS = 0.42). However, model validation using data from 1997–2002 showed that the simulated in-stream nitrate concentrations were above the observed concentrations throughout the entire period (R2 = 0.34, NS < 0). These results show that soft data can be used to constrain model parameters, resulting in a more accurate model of the catchment, but do not guarantee the best validation results as the simulated processes may not occur at the same time and rate as they did in the catchment. |
| Databáze: | OpenAIRE |
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