Regional/macroscale hydrological modelling: a Scandinavian experience
2001
Gottschalk, Lars | BELDRING, STEIN | Engeland, Kolbjørn | TALLAKSEN, LENA | Sælthun, Nils Roar | KOLBERG, SJUR | MOTOVILOV, YURY
Regional hydrological modelling or hydrological macro-modelling implies the repeated use of a model everywhere within a region using a global set of parameters. A majority of parameters of the macroscale hydrological model must be estimated, a priori, using existing climate, soil and vegetation data. Observations for calibration and validation of the model are only available at a subset of sites where the model is applied. For all other sites without observations the model application needs to be based on global parameters. Ecomag is a distributed, physically-based model, adapted for application to a regular grid and is used as a platform for model development at the University of Oslo (UiO). Valuable insights into hydrological processes and incitements for model development may be gained by comparing high-quality data sets and model calculations. The inter-European multidisciplinary NOPEX (NOrthern hemisphere climate Process land surface Experiment) project is one of a few prioritized full-scale land surface experiments that provides high quality data sets for a boreal environment that are utilized herein. These are complemented with data from a new experimental area in the mountains in mid-eastern Norway around Lake Aursunden. The UiO model platform facilitates the use of different parameterizations of sub-grid variability. The present work focuses on the identification of process scales for the two study areas and related process parameterization as evaluated from the available data sets. The establishment of a regional set of parameters and data requirements are two other important issues discussed.
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