Figure 5 Rate of snow melting in the Hanliu River Basin during spring and winter snowfalls(a: Spring; b: Winter)
In the Hanliu River Basin, there are differences in the snowmelt process between spring and winter. In spring (Fig. 5(a)), the rate of snow ablation is slower. The proportion of snow cover in the watershed was initially 18.67% due to snowfall, and then gradually decreased. From day 13, the rate of snowpack decline became faster. By day 16, the proportion of snow cover had decreased by a total of 6.75%. During the winter season (Fig. 6(b)), snowfall initially brought the proportion of snow-covered area in the watershed to 38.47%. However, it rapidly declined and stabilized after day 5, with the proportion of snow cover decreasing by 23.31% during this time period. The overall rate of decline was -1.5% per day. Therefore, the rate of ablation of the spring snowpack in the Han River Basin was lower than that of the winter snowpack.