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The probability distribution of winds in Shanghai under the influence of different paths of typhoon is consistent with the distribution of wind speed. When the landfalling typhoon impacts, the probability of occurrence of gale 6 or above in the urban area is 29%, and the probability of gale 7 or above is only 2%; the probability of gale 6 or above in the suburbs is generally more than 50% and 10%, and the maximum is Nanhui, Fengxian and Jinshan south can reach 65% and 20% respectively. When the offshore typhoon goes northward, the probability of occurrence of gale 6 or above in the urban area is 14%, gale 7 or above is zero, most of the gale 6 or above in the suburbs is 40% to 50%, and the largest number of Chongming is 61%. ; Grade 7 or higher winds occur in the general probability of 11% to 18% of the suburbs, with the largest Pudong New Area, up to 21%.
The monitoring of wind speed and direction recorders found that when the typhoon affected Shanghai, the urban wind speed was the smallest, the urban area was larger in the east and south than in the west and north, and the wind speeds were highest in the eastern and southern coastal areas of Shanghai. When the typhoon landed, the wind speed in the southern part of Hangzhou Bay was closest to Shanghai, and the wind speed in the eastern Yangtze River estuary was the highest when the typhoon in the north offshore affected. The dominant wind direction of the maximum wind speed when the landfalling typhoon is affected is eastward, and the dominant wind direction when the typhoon is affected by the north is northeasterly north wind. As the development of the city changes the environment of the underlying surface, the wind speed when the typhoon affects Shanghai is significantly reduced.
Research on wind speed and direction distribution characteristics of wind speed and direction recorder in Shanghai
In order to prevent the lodging of trees, the Shanghai Green Management Department needs to use a lot of material resources and manpower to carry out comprehensive pruning and reinforcement of the trees in the city before the typhoon. Due to the topographical differences in Shanghai, especially the large-scale urban construction in Shanghai in the past decade or more, during the typhoon impact on Shanghai, there was a significant difference in the distribution of wind speeds across the country. Understanding the distribution of the wind speed and direction under the influence of different typhoon paths in Shanghai can effectively arrange human and material resources to prune and reinforce the trees. This will not only reduce unnecessary losses, but also benefit the growth of trees and produce considerable economic benefits. Social benefits. Wind speed and direction recorders monitor issues such as wind speed and direction, providing a basis for the formulation of green protection measures.