2008 Volume 52 Pages 487-492
Through meteorological and hydrological observations in a small mountainous watershed, melting runoff processes in this area are investigated and the following is clarified. When solar radiation only caused snow-melting, lowering of snow deposition was successfully calculated using accumulation of solar radiation. In such a stage, that melting did not caused increase in the river-water discharge because most of melting water was considered to be stored within the snow deposition layer. From late winter to early spring, a daily periodic variation in the river-water discharge was seen. Main energy of its snow-melting is solar radiation and sensible heat flux. Based on analyses on that periodic characteristic, the former is known to be roughly five times higher than the latter. Also roughly 90% of snow-melting water infiltrates into the soil layer in the slope and causes increase in base-flow discharge, while the residual water, approximately 10% of that water, contributes to increment of daily varying discharge as a direct runoff.
