PARAMETRIZATION OF HEAT AND WATER TRANSFER THROUGH SNOWPACK FOR SIMULATION OF SEASONAL VARIABILITY OF HYDROLOGICAL LAND PARAMETERS

E. E. Volodina, L. Bengtsson, and V. N. Lykosov

Three consecutively complicated versions of description of the heat and moisture transfer processes in snowpack for a one-dimensional model of the atmo¬sphere—soil interaction are considered. Results of simulation by means of these parametrizations compared with each other and with observed data from the Valdai research station. The observed data span the 18-year period from 1966 to 1983. It is shown that processes of the percolation of meltwater and rain through snow and their freezing, as well as refreezing of the water that is trapped within the snowpack, essentially affect the water-equivalent snow depth and hence the runoff. To a lesser extent but still noticeably, these processes influence the evolution of the moisture regime not only in winter but also in subsequent seasons.