Analysis The Background Of Sandstorm Disaster Climate And The Variation Characteristics Of Sandstorm In Shache County

Shache County from1961to2009years of time span the scope of the sanddisasters temperatures, precipitation, sunshine hours, evaporation amount, relativehumidity, wind speed, wind direction, high winds weather, day number, strong windscontinued to time, sandstorm days, the Jansa weather days, dust weather days,12kinds of indicators collected for the unit of sand disaster data, regression analysis ofthe collected data, the trend line analysis, anomaly percentage of the cumulativeanalysis, the Mann-Kendall mutation test, and statistical analysis, the mainThe studyconcluded that:(1) In the last50Years temperature is rising, which is consistent with thetemperature trend of China’s northwest region.50a to the average annualtemperature is11.8℃. Temperature changes during the year there are seasonalvariations, precipitation overall as an increasing trend, and I had the Northwest to dryto warm and wet changing trend, the past50years the average annual rainfall of52.7mm, statistical laws that years of precipitation, Shache County precipitation,inter-annual rate of change, and the years the uneven distribution of precipitation anddust storms occur a negative relationship between the number of days, more rainfallyear, less than normal sand and dust storms. Sunshine hours showed a graduallydecreasing trend, and reduce the rate of sunshine hours average2891.6h. Evaporationshowed a gradually decreasing trend, the average evaporation is2268.7mm, relativehumidity tended to decrease the average relative humidity of more than53%.(2) Shache County gale mainly west gale, gale wind direction depends on theinvasion of cold air path easterly gale less.50a gale days a decreasing trend,50a galeaverage number of days to7days, windy weather is mainly concentrated in springand summer, the most frequent windy weather season is summer, a year in6monthhigh winds most days. Windy weather more than19:00-05:00.when the majority ofstrong winds in the evening to night. Strong winds generally shorter duration, themajority within one hour gale.(3)50a Dust storm days showed decreasing trend of sandstorm days of the1990s to reduce the highest rate. Sandstorm days for many years an average of14days, sandstorms is mainly concentrated in spring and summer, the year in June, thenumber of sandstorm days.50a Jansa day trend of decreasing the The Jansa days formany years an average of37days, blowing dust is mainly concentrated in spring andsummer, blowing dust is the most frequent season was summer, a year in June, Jansadays up. Dust weather days showed a downward trend, short dust storms, blowing sand, dust days decreasing trend of sand and dust storms in the area to dust, blowing,dust storms for the post. The close ties of dust weather and area high winds, westnortherly gale probability of occurrence of dust weather...