张家口坝上错季蔬菜温室育苗期大风灾害分析

Analysis of Gale Disaster in Season-staggered Vegetable Greenhouse in Bashang Area of Zhangjiakou

对张家口坝上地区康保、沽源、尚义和张北4县1960-2017年错季蔬菜温室育苗期4月上旬至5月上旬各旬不同级别大风日数以及大风出现概率进行统计分析。结果表明,极端风速多出现在20世纪70-80年代;康保、尚义出现风灾的概率略大,沽源出现风灾的概率最小;4月上旬至5月上旬坝上最大风速出现在张北,为29.7 m/s(1981年5月2日);近些年最大风速和大风日数均有所减少。

Statistical analysis was made on the gale days of different scales and the probability of gale occurrence from early April to early May of each ten-day in the seedling stage of season-staggered vegetable greenhouses in four counties including Kangbao,Guyuan,Shangyi and Zhangbei in Bashang area of Zhangjiakou during the period of 58 years(from 1960 to 2017). The results showed that extreme wind speed mostly appeared in the1970 s to 1980 s. Kangbao and Shangyi had slightly higher probability of gale disaster,while Guyuan had the lowest probability of gale disaster. From early April to early May,the maximum wind speed appeared at 29.7 m/s in Zhangbei(May 2,1981). In recent years,the maximum wind speed and the gale days had decreased.