3.2.2 Hanliu River
The distribution pattern of the stable snowpack area in the Hanliu River is illustrated in Figure 8. During spring, the stable snowpack area is relatively small, comprising only 1.39 percent of the total district area. It is primarily concentrated in the higher elevation regions surrounding the watershed, while no distribution is observed within the watershed itself. Vertically, the proportion of area covered by stable snowpack gradually increases with elevation. Stable snow cover is absent below 4000 meters above sea level. In the elevation range of 4000-5000 meters, some stable snow is present, accounting for 3.08 percent of the snow-covered area. However, the majority of stable snow during spring is found in areas with altitudes exceeding 5000 meters.