Typing and disaster loss evaluation of freezing events based on the comprehensive intensity index of low temperature,rainfall/snowfall and freezing in Hubei Province
Low temperature,rainfall/snowfall and freezing is a complex climate event.Although extreme low temperature,rainfall/snowfall and freezing events occur infrequently,they often cause serious impacts.Researching evolutionary characteristics of low temperature,rainfall/snowfall and freezing events is of great significance for effective defense and mitigation of disaster impacts.By using daily meteorological ob-servation data from 1981 to 2024 in Hubei and selecting indicators from three aspects:low temperature,rainfall/snowfall and freezing,a com-prehensive evaluation model for large-scale sustained low temperature,rainfall/snowfall and freezing events was established.According to the types of disaster-causing factors and the disaster characteristics of the affected bodies,these events were classified and ranked.Com-bined with the historical disaster data,the disaster characteristics of large-scale sustained low temperature,rainfall/snowfall and freezing events in Hubei since 1981 were then analyzed.The results are as follows.(1)There have been a total of 64 large-scale sustained low temper-ature,rainfall/snowfall and freezing events in Hubei in the past 44 years,with an average of 1.5 occurrences per year.January has the highest frequency of occurrence,accounting for about 42%,followed by February,accounting for about 34%.(2)The large-scale sustained low tem-perature,rainfall/snowfall and freezing events in Hubei are classified into six types,with rain and snow type accounting for 40%,low tempera-ture,rainfall/snowfall and freezing type accounting for 31%,and low temperature,rain,and snow type accounting for 16%,other types ac-counting for a total of 13%.The strongest 10 events all belong to low temperature,rainfall/snowfall and freezing type.(3)The direct economic losses caused by low temperature,rainfall/snowfall and freezing disasters in Hubei have shown an overall increasing trend,but the proportion of direct economic losses to GDP has shown a certain decreasing trend,with a relatively small proportion since 2012.(4)The correlation be-tween the comprehensive intensity index and direct economic losses of large-scale sustained low temperature,rainfall/snowfall and freezing events in Hubei follows a power curve distribution.When the comprehensive intensity index of the event exceeds 1.85,the direct economic losses increase rapidly.
low temperaturerainfall/snowfall and freezingcomprehensive intensitytypingrecurrence periodsdisaster loss curve
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