Temporal and Spatial Characteristics of Wind Disasters for Single Steel-Frame Greenhouses in Hangzhou
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Abstract:
Based on the gale data of Hangzhou National Base Station from 1951 to 2018 and the maximum wind speed data of 373 automatic meteorological stations after the quality control from 2014 to 2018, to provide suggestions on agricultural development, the MK method and GIS mapping technology are used to analyze the interannual variation of strong winds since the establishment of Hangzhou Station and the spatial distribution characteristics of different wind levels in recent five years, combined with the wind disaster grade index of single steelframe greenhouses and the townlevel data of the third agricultural census. The results show that the number of strongwind days in the year of severe disasters in the greenhouses decreases fluctuationally, and a sudden change happened in 2001, with a more obvious downward trend, and the changes in various seasons are similar. As a result, the areas where the greenhouses suffered from the light, medium and heavy wind disasters are in the northwestern Linan, Anding Mountain of Fuyang and the Hangzhou Bay in the northeastern Zhejiang Province. The Hangzhou Bay area is also the main development area of facility agriculture, which requires higher construction standards. The central area of Hangzhou is the low value area of high wind, which is conducive to the further development of facility agriculture. The number of days and times of serve wind disasters causing moderate to severe wind disasters in singlesteel frame greenhouses are the highest in summer, followed by spring, and the least in autumn, with the longest duration in winter, followed by autumn and the shortest in spring.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.