Assessment of the relation between the NAM rainfall-runoff model parameters and the physical catchment properties

Abstract:

The NAM module of the MIKE-11 code was applied to four Belgian Catchments with the intention of finding relationships between model parameters and physical catchment descriptors (PCD). Ten NAM module parameters (NMP) out of the maximum set of 15 parameters were used since the irrigation and snowmelt components were not considered. Model calibration was performed using hydrological time series of 7 to 12 years, finding a good agreement between observed and simulated discharges. Of the 10 NMP, 9 were found to be statistically independent. Only 12 PCD exhibited independence out of a total of 27 considered. The relationships between the retained 9 NMP and 12 PCD were studied finding high correlation coefficients between them. Only three relationships (Umax, CK1, 2 and Carea) were found statistically significant, and the drainage density was found to be the most important PCD. The authors recommend validating the derived relationships before using them in a pbkp_redictive context.

Año de publicación:

2003

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