陇南市武都区大风时空演变气候特征及灾害风险区划

根据陇南市武都区1971—2010年大风资料分析得出:武都区大风一年四季均可出现,尤以4—8月出现频数最多,占总次数的80%,20世纪70—80年代为大风多发时期,进入90年代以后大风天气明显减少,大风可造成林木和作物的倒伏、断枝、落花落果等,造成设施农业的破坏,影响生长发育和产量形成。该文结合人口、GDP、耕地比等资料,利用GIS技术分析得出:陇南市武都区大风危险性等级和风险等级白龙江河谷最高,其余各地由低到高递减。

Gale Spatial and Temporal Evolution of the Climate Characteristics and Risk Zonation of Wudu District in Longnan City

Analysing the gale datas of Wudu district from 1971 to 2010,the results showed that strong winds would appear all year round,especially from April to August,frequency up to 80% of the total number of 1970s to 1980s,strong windy frequency significantly reduced in 1990s.strong winds caused trees and crop lodging,snags,shattering,etc.,lead to the destruction of agricultural facilities,affected the growth and yield formation.Combining with population,GDP,arable land by using GIS technology,this paper obtained: gale dangerous level and the highest level of risk was Bailongjiang Valley in Wudu district,and throughout the remainder from low to high decreasing.