3.2 Parameterization
We synthesized the observations from the Station, which included
meteorological data, snow measurements, evaporation data, descriptions
of soils and landscapes, data on typical active layer depth, ground
temperature at various depths, etc. (Grave, 1959; Grave et al., 1964;
Grave & Koreisha, 1957, 1960; Koreisha, 1963). The parametrization of
the Hydrograph model was performed based on joint analysis of available
field descriptions of ground hydrothermal regime and corresponding
patterns of runoff formation in typical landscapes.
According to altitudinal zonation, the catchment of the Suntar river is
divided into 4 RFCs as described above: goltsy (RFC #1), mountain
tundra (RFC #2), sparse larch forest (RFC #3), and swampy sparse larch
forest at waterlogged soils (RFC #4) (Fig. 1). For each RFC, a
schematization of the vertical profile is developed that considers
vegetation, soil composition, snow accumulation features and runoff
formation processes. In the Hydrograph model, the soil column is divided
into computational soil layers (CSL), which may have different depths
but are usually taken to be equal to 10 cm, and the total depth of the
calculated soil profile should exceed the maximum active layer depth, if
the model is applied to the permafrost zone. In this study the
calculation depth of the ground column was taken as 2 meters (20 CSL by
10 cm). This value is assigned from the assumption of maximum possible
active layer depth (150 cm) (Grave, 1964).