## 3 Result and Discussion
### Simulation Results of Wind Field Distribution
The wind rose diagram and the wind speed probability density diagram are shown in Figure 12. In region 1, the maximum wind speed at P1 is 13.10 m/s, the primary dominant wind direction is south-southwest wind (SSW), accounting for 17.92% of the entire simulation period, the secondary dominant wind direction is southwest wind (SW), accounting for 16.82% of the entire simulation period, the wind speed is mainly concentrated around 2-5 m/s, and the wind speed in the probability interval of drifting snow occurrence (3-8 m/s) accounts for 61.82% of the total wind speed in the simulation period; at P2, the maximum wind speed is 17.91 m/s, the primary dominant wind direction is southwest wind (SW), accounting for 41.51% of the entire simulation period, the secondary dominant wind direction is west wind (E), accounting for 28.54% of the entire simulation period, the wind speed is mainly concentrated around 5-9 m/s, and the wind speed in the probability interval of drifting snow occurrence accounts for 56.39% of the entire simulation period, the secondary dominant wind direction is southwest wind (SW), accounting for 41.51% of the entire simulation period, the secondary dominant wind direction is west wind (E), accounting for 28.54% of the entire simulation period, the wind speed is mainly concentrated around 5-9 m/s, and the wind speed in the probability interval of drifting snow occurrence accounts for 56.  
the total wind speed in the simulation period; at P3, the maximum wind speed is 16.7 m/s, the primary dominant wind direction is west-northwest wind (WNW), accounting for 22.51% of the entire simulation period, the secondary dominant wind directions are west wind and southwest wind, accounting for 18.81% and 18.39% of the entire simulation period, respectively, the wind speed is mainly concentrated around 6-10 m/s, and the wind speed in the probability interval of drifting snow occurrence accounts for 50.73% of the total wind speed in the simulation period. Figure 11: The distribution of average wind field in the simulation period. (**a**) Wind field of region 1 in December; (**b**) wind field of region 2 in December; (**c**) wind field of region 1 in January; (**d**) wind field of region 2 in January; (**e**) wind field of region 1 in February; (**f**) wind field of region 2 in February. Figure 12: Wind rose diagram and the wind speed probability density graph. (**a**) the wind rose diagram of P1; (**b**) the wind speed probability density graph of P1; (**c**) the wind rose diagram of P2; (**d**) the wind speed probability density graph of P2; (**e**) the wind rose diagram of P3; (**f**) the wind speed probability density graph of P3; (**g**) the wind rose diagram of P4; (**h**) the wind speed probability density graph of P4; (**i**) the wind rose diagram of P5; (**j**) the wind speed probability density graph of P5. In region 2, the maximum wind speed at P4 is 12 m/s, the primary dominant wind direction is south-southwest wind (SSW), accounting for 22.84% of the entire simulation period, the secondary dominant wind direction is west wind (W), accounting for 20.17% of the entire simulation period, the wind speed is mainly concentrated around 2-4 m/s, and the wind speed in the probability interval of drifting snow occurrence accounts for 55.59% of the total wind speed in the simulation period. At P5, the maximum wind speed is 14.90 m/s, the primary dominant wind direction is southwest wind (SW), accounting for 38.79% of the entire simulation period, the secondary dominant wind direction is southwest wind (SW), accounting for 26.81% of the entire simulation period, the wind speed is mainly concentrated around 4-8 m/s, and the wind speed in the probability interval of drifting snow occurrence accounts for 69.06% of the total wind speed in the simulation period. Since the climate of the study area is mainly influenced by the south branch jet stream of the westerly circulation, the wind direction is mostly west or southwest wind, which is consistent with the actual situation.