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《Journal of Catastrophology》 2014-02
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Hazard Rainfall Threshold Analysis of Rainfall-induced Geological Disasters in Hunan Province

Chen Jingjing;Yao Rong;Wen Qiang;Tang Jie;He Zhengyang;Cao Hengya;Hunan Meteorological Observatory;Changde Meteorological Service;Daoxian Meteorological Service;Hunan Meteorological Service;  
Hunan province is one of the provinces that are mostly affected by geological disasters. The 12 h and daily rainfall data of 97 conventional stations in Hunan from 1980 to 2007,geological disasters information occurred in the same period in Hunan and disaster ceremony records information are used. The 9 d effective rainfall before geological disasters occurrence is calculated( including the same day of disaster occurrence,the same below),and the geological disasters events caused by rainfall are distinguished. The different types of rainfall caused geological disasters are determined by introducing a reasonable coefficient,and the thresholds of different types of rainfall that could cause geological disasters are calculated. It is found that there are 64. 6% rainfall-induced geological disasters( a total of 1384 cases) in 2142 effective geological hazard information,of which there are 91. 4% caused by the short-term rainfall,8. 6% caused by the long duration rainfall; It is the figure of contribution rate of different types of rainfall to geological disasters,the rainfall threshold and disaster frequency distribution in Hunan which are combined with the hazard threshold,displayed the hazard critical rainfall and geological disasters high incidence area of Hunan.
【Fund】: 国家财政部/科技部公益类行业专项(GYHY201306016);; 湖南省气象局2010年短平快科研课题
【CateGory Index】: P694
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