河西东部设施农业风灾指标设计及其特征研究

Wind Disaster Index Design for Facility Agriculture in Eastern Hexi Corridor of Gansu

利用1980—2014年河西东部逐日最大与极大风速资料,回归构建长序列并以双条件约束设计风灾指标,定义轻度、中度、重度、特大等级区间。分析显示:研究区域中北部地区4—5月风害最为严重,灾害强度与集中度基本同步。在年际变化上轻度灾害多波动,中重度灾害明显减少,特大灾害时有发生,北部地区风灾偏重,风灾综合指数从凉州、古浪、天祝、民勤、永昌、乌鞘岭逐渐增大。凉州、古浪为低值区域,可作为设施农业首选区域,天祝需要因地制宜,民勤要选择抗风性能良好的棚型,永昌则不适宜建设与推广。研究结果为风灾预警评估提供了参考指标,为设施农业规划布局提供了科学依据,且在一定程度上填补了风灾评估体系的空白。

Based on the daily maximum wind speed and the extreme wind speed data of eastern Hexi Corridorin Gansu from 1980 to 2014, the mathematical regression method was used to construct a long sequence ofwind speed data, and then with double conditional constraint indicators, the authors defined the mild,moderate, severe and heavy grade range. The results showed that the north central region had the most seriouswind disaster to facility agriculture between April and May, the disaster intensity and concentration degreewere almost synchronous. In annual variation, the mild disaster had multi-fluctuation, moderate and seriousdisasters were significantly decreasing, heavy disasters occurred sometimes. Overall, the north region hadparticularly severe wind disasters, the wind disaster composite index increased in the order of Liangzhou,Gulang, Tianzhu, Minqin, Yongchang and Wushaoling. Because Liangzhou and Gulang had the smallest winddisaster composite index, they could be the primary choice of facility agriculture development in the region,Tianzhu County should adjust measures to local conditions in facility agriculture, Minqin should choose goodwind resistance sunlight greenhouse, and Yongchang was not suitable for the promotion of facility agriculture.The results of the research could provide a reference for wind disaster forecasting and scientific layout ofregional facility agriculture, and fill the gaps of regional disaster assessment system.