Calibration of the wflow_sbm model for the Rhine catchment using EOBS data¶
DEM and landuse data¶
The digital elevation model used was the SRTM 90x90 m resolution dataset. The DEM was used to determine the river network and the altitude of each cell using the following steps:
# The 90x90 m DEM was used to determine the local drainage network (D8) and pits were removed from the network # The network determined above was used to fix the river network when resampling the DEM to a 900x900 m resolution DEM. # [pm] resampling procedure
Corina land-use map and reclassification [PM]
Forcing data¶
The wflowsbm model was calibrated for the Rhine basin using daily temperature and precipitation data from the EOBS dataset [Haylock] (version 5.0). Discharge was taken from the CHR daily dataset ([gorgen]). Potential evapotranspiration was determined using and adjusted version Hargraeves’ method ([weiland]):
In which 0.0031 is a calibration factor and 
is the clear sky solar
radiation expressed in mm/day.
Within the wflow_sbm model the temperature is corrected for altitude differences within one EOBS cell. For each wflow_sbm 1x1km cell the temperature is corrected by using the differences between the altitude in that cell and the average altitude within the matching EOBS cell and applying a lapse rate.
Gauge data from CHR
Calibration procedure¶
Calibration was performed in two steps. First an initial gues of all parameters was made based on land-use type. Secondly a full matrix search of a number of parameters was performed and best perfroming sets have been chosen per subcatchment (based on NS and bias).
The plots below show the calibration results for the period 1985 – 1995 for the following stations:
Rhein-Basel, Rheinhalle
Kalkhoven
Rockenau
Kaub
Koeln
Lobith
Raunheim
Cochem
Andernach
Maxau
Schermbeck
Menden
Hattingen
The title of the plots also shows the model efficiency (Nash and Sutcliffe).
Original landuse¶
Modified landuse¶
| [Haylock] | Haylock, M.R., N. Hofstra, A.M.G. Klein Tank, E.J. Klok, P.D. |
Jones, M. New. 2008: A European daily high-resolution gridded dataset of surface temperature and precipitation. J. Geophys. Res (Atmospheres), 113, D20119, doi:10.1029/2008JD10201”
| [gorgen] | Görgen, K., Beersma, J., Brahmer, G., Buiteveld, H., Carambia, M., |
de Keizer, O., Krahe, P., Nilson, E., Lammersen, R., Perrin, C. and Volken, D. (2010) Assessment of Climate Change Impacts on Discharge in the Rhine River Basin: Results of the RheinBlick2050 Project, CHR report, I-23, 229 pp., Lelystad, ISBN 978-90-70980-35-1
| [weiland] | Sperna Weiland, F. C., C. Tisseuil, H. H. Dürr, M. Vrac, and L. P. |
H. Van Beek, “Selecting the optimal method to calculate daily global reference potential evaporation from CFSR reanalysis data for application in a hydrological model study,” Hydrology and Earth System Sciences, vol. 16, pp. 983–1000, 2012.