3.1.2 Hanliu River
In the Hanliu River Basin, there are differences in the snowmelt process between spring and winter. In spring (see Fig 5(a)), the rate of snow ablation is slower. Initially, snowfall increased the proportion of snow cover in the watershed to 18.67%, which then gradually decreased. From day 13 onwards, the rate of snowpack decline became faster, resulting in a total decrease of 6.75% in the proportion of snow cover by day 16. During the winter season (see Fig 6(b)), snowfall initially increased the proportion of snow-covered area in the watershed to 38.47%. However, it rapidly declined and stabilized after day 5, with a decrease of 23.31% in the proportion of snow cover during this period. The overall rate of decline was calculated to be -1.5% per day. Consequently, the rate of ablation of the spring snowpack in the Han River Basin was lower than that of the winter snowpack.