Analysis Of The Spatial And Temporal Variability Of Wind-blown Snow In Heilongjiang Province And Its Mechanism

The wide distribution of snow is an important material condition for the formation of wind-blown snow in Heilongjiang Province,coupled with changes in wind speed,making Heilongjiang Province a major area affected by wind-blown snow,which not only causes traffic safety hazards,but also has a significant impact on the region’s spring soil recharge water sources and the safety of people’s lives and property.In this paper,using the daily snowfall,maximum snow depth and maximum instantaneous wind speed data from October 2005-2019 to April(winter)at the climate center of Heilongjiang Province,we analyzed the spatial and temporal distribution and change characteristics of the total number of wind-blown snow days and different levels of wind-blown snow days(low blowing snow days,high blowing snow days and blizzard snow days)under different determination criteria through trend analysis,spatial interpolation,analysis of variance and correlation analysis,and further analyzed the influence of snow depth and wind speed on wind-blown snow formation on this basis,and obtained the following research results.(1)Ⅰ standard Heilongjiang province wind blowing snow total days,low blowing snow days,blizzard days are decreasing trend,high blowing snow days are increasing trend,its rate are:-0.68 d/10 a,-0.32 d/10 a,-0.36 d/10 a,0.27 d/10 a,all failed 90%significance test,wind blowing snow total days change most significantly,its average value are.Spatial distribution,the central and eastern regions are the high value areas of total windblown snow days,the highest value occurs in Tonghe at 39.0 d,the eastern regions are the high value areas of low blowing snow and high blowing snow,the highest value occurs in Muling and Shangzhi at 5.26 d,4.40 d,respectively,the high value areas of blizzard days are distributed in the central and eastern regions,where Hulin The highest number of snowstorm days is 8.07 d;the Songneng Plain is the low value area for all four.The total number of wind-blown snow days,low blowing snow days,high blowing snow days spatial changes are more similar,the southern increase trend is more significant,the number of snowstorm days in the northwest is increasing trend,the eastern region tendency rate are smaller.(2)The total number of wind-blown snow days,low blowing snow days,high blowing snow days,and blizzard days in Heilongjiang province by Ⅱ criteria are increasing(P>0.1),and their rates are 7.71 d/10 a,4.37 d/10 a,2.39 d/10 a,and 0.96d/10 a,respectively,with the fastest increase in total wind-blown snow days,and their mean values are 38.78 d,23.01 d,9.44 d,and 6.33 d.The spatial distribution of the total number of wind-blown snow days in the north is the high value area in Wuying with 88.20 d.The maximum value occurs in Wuying with 88.20 d.Spatial distribution,the northern part is the high value area of the total number of wind-blown snow days,the maximum value appears in Wuying as 88.20 d.Low blowing snow days,high blowing snow days high value area are within the territory of Yichun,respectively:60.20 d,25.73 d,the east for the high number of days of snowstorm areas,including Yilan snowstorm days for the most 20.80 d;the southwest of the four are lower.The total number of wind-blown snow days,low blowing snow days,high blowing snow days spatial changes have shown a decreasing trend from the central to the east and west sides.(3)The maximum snow depth has the most critical effect on wind-blown snow formation,and the wind speed has the second most important effect on wind-blown snow.The average value of the contribution of maximum snow depth to the total number of wind-blown snow days is 74.32 %/a,and the average values of the contribution of maximum snow depth to the number of low blowing snow days,high blowing snow days,and storm snow days are 68.88 %/a,62.81 %/a,and 24.95 %/a,respectively;the average value of the contribution of wind speed to the total number of wind-blown snow days is 10.92 %/a,and the average values of the contribution of wind speed to the number of low blowing snow days,high blowing snow days,and storm snow days are 21.79 %/a,6.52 %/a,and 6.52 %/a,respectively.Only Suifenhe,Wuying,Huainan and Jiayin of the 60 stations in the province show wind speed as the dominant factor,and the rest of the maximum snow depth as its key factor.This paper clarifies the two standards of wind-blown snow spatial and temporal distribution and change characteristics,and II standard as an example to analyze its impact factors,the results of this paper can be used as the basis for future wind-blown snow disaster research,but also for future wind-blown snow disaster prediction and forecasting to provide the relevant scientific basis.