Calibration validation revisited or how to make better use of available data: Sub-period calibration

Parameter identification of conceptual hydrological models depends largely on calibration, as model parameters are typically non-measurable quantities. For hydrological modeling the identification of “realistic” parameter sets is a key objective. As a model is intended to be used for prediction in future it is also crucial that the model parameters be time transposable. However, previous studies showed that the “best” parameter set can significantly vary over time.