Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Implementation of a dynamical spatial distribution of snow in a rainfall-runoff model

A new snow distribution model has been implemented in the Swedish HBV model. The new distribution model takes into account that the spatial distribution of snow changes during the snowy season, from a very skewed at the start of the accumulation period, a steadily decreasing skew in during the accumulation period and an increasing skew during the melting period.

The shape of the distribution of snow is believed to be important for the development of snow free areas during melting. The distribution of snow is at all times gamma distributed, but with the shape parameter as a function of the present amount of snow. The increase of snow-free areas as a response to a melting event is analytically linked to the parameters of the distribution.

The approach was implemented in the HBV model and tested for two alpine basins in Southern Norway. The new approach gave similar results as with using the traditional distribution model. However, when deviations between modelled and remotely sensed snow coverage were taken into account, significant improvements was observed for one of the basins.

Reported by

Norwegian Water Resourses and Energy Directorete, Section for Water Balance
P.O.Box 5091, Majorstua
0301 Oslo
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