热带气旋灾害特征及风险评估

利用气象灾害普查资料、影响浙江丽水热带气旋的有关历史资料以及历年丽水市的国内生产总值(GDP)统计资料,对1984～2007年影响丽水的热带气旋灾害特征进行统计分析,并应用改进后的气象灾害分级标准,对丽水的热带气旋灾害进行风险评估。结果表明:丽水的热带气旋灾害是各类气象灾害中最严重的;24年中致灾热带气旋年发生频数为1.2个;5、7、8、9、10月均有致灾热带气旋,其中8月气旋个数最多、影响最严重;热带气旋灾害在空间上呈明显的自东南向西北减轻的特点,但各月之间略有差异;热带气旋灾害风险青田最大,松阳最小,且两者之间差异巨大。

Characteristics and Risk Assessment of Disasters Induced by Tropical Cyclones

By using the statistical data of meteorological disasters,the historical data of Tropical Cyclones（TCs） affecting Lishui,Zhejiang Province,and GDP（Gross Domestic Product） data of Lishui in the past years,the characteristics of tropical cyclone disasters affecting Lishui from 1984 to 2007 are statistically analyzed.The risk assessment for tropical cyclone disasters affecting Lishui is conducted by use of the improved meteorological disaster grading standards.The results show that the tropical cyclone disaster was most serious among meteorological disasters in Lishui.In the recent 24 years,the occurrence frequency of disasters-causing tropical cyclones was 1.2 per year.The disaster-causing tropical cyclones happened usually in the months of May,July,August,September,and October,with the maximum number and the severest impact in August.Although there was slight difference in different months,the tropical cyclone disasters presented an obvious mitigation from southeast to northwest.The largest risk is found in Qingtian County and the minimum in Songyang County with a huge difference.