51a新疆雹灾损失的时空分布特征

用新疆1952-2002 a的900例雹灾资料,对雹灾发生频次、受灾面积、经济损失的时空分布特征进行分析。结果表明,新疆雹灾频次、受灾面积、经济损失从20世纪70年代开始增长较快,受灾面积、频次1990年达到最大,可比经济损失最大值出现在1995年。雹灾主要集中在4～9月,雹灾发生频次6月最多,受灾面积5月份最多,可比经济损失值以7月份最大。按灰色关联灾情评估模型可将新疆分为严重雹灾区、重雹灾区、中雹灾区、轻雹灾区和微雹灾区五个区域。其中:阿克苏为雹灾重点防御地区,喀什、塔城、伊犁、博州、石河子为次重点防御地区。

Temporal and spatial distribution features of hail disasters in Xinjiang in Recent 51 Years

In this paper,the temporal and spatial distribution of the occurring frequency,disaster areas and economic loss of hail disasters in Xinjiang are analyzed based on the data of 900 hail cases occurred in Xinjiang during the period of 1952~2002.The results show that the occurring frequency of hail disasters in Xinjiang increased rapidly from the 1970s,thus the disaster areas were obviously enlarged and the economic loss was significantly increased,the maximum values of occurring frequency of hail disasters and hail disaster areas occurred in 1990,but the most serious economic loss caused by hail disasters occurred in 1995.Generally,the hail disasters in Xinjiang occur mainly during the period from April to September,and the highest values of occurring frequency,disaster area and economic loss of hail disasters occur in June,May and July respectively.According to the grey correlation disaster evaluation model,Xinjiang can be divided into 5 hail disaster areasi,e..t,he most serious disaster area,serious disaster area,moderate disaster area,slight disaster area and very slight disaster areai,n which Aksu Prefecture is a key region in preventing hail disasters,and then Kashgar Prefecture,Tacheng Prefecture,Yili Kazak Autonomous Prefecture,Bortala Mongol Autonomous Prefecture,and Shihezi region.