基于最优分割法的上海市暴雨和大风致灾阈值研究

doi:10.3969/j.issn.1673-503X.2025.01.012

Abstract

Abstract: Based on meteorological disaster data in Shanghai from 2012 to 2021,this study investigated the mechanisms by analyzing the disaster regularity of meteorological conditions trigger disasters and employs an optimal division method to derive district-specific threshold indicators for rainstorm and gale disasters.The results show that the average precipitation with an hourly rainfall intensity over 30.7 mm,6-hour cumulative rainfall over 64.5 mm and 24-hour cumulative rainfall over 91.7 mm are prone to induce waterlogging,and the average wind speed over 12.4 m·s^-1 are associated with gale disasters.There are significant differences in the disaster threshold among different administrative regions.For the rainstorm,the hourly rainfall intensity threshold in downtown area is generally higher than that in suburban areas,but the 24-hour cumulative rainfall threshold is obviously lower than that in suburban areas.For strong wind,the threshold of disaster caused by strong wind in downtown area is significantly lower than that in suburban areas.This study provides a quantitative reference for meteorological disaster prevention and urban governance in each district of Shanghai by developing the disaster threshold.

Key words: Disaster threshold, Rainstorm disaster, Gale disaster, Disaster alarms

CLC Number:

P429

YANG Chen, WANG Qiang, MU Haizhen, SUN Yi. Study on the disaster threshold of rainstorm and gale in Shanghai based on optimal division method[J]. Journal of Meteorology and Environment, 2025, 41(1): 97-103.

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Study on the disaster threshold of rainstorm and gale in Shanghai based on optimal division method

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