Damage characteristias of Typhoon Rananim and primary research on typhoon disasters in Zhejiang Province

Based on the disaster characters related to No.0414 Typhoon Rananim,this paper analyses the basic properties and regularities of typhoon disasters occurring in Zhejiang Province systematically.The paper points out that No.0414 Typhone Rananim showes its important characters such as the unuasual heavy rain,the wind power which was beyond the record in historical data,the flood in some regions and many secondary disasters.Usually the typhoons or tropical depressions influencing Zhejing Province occur from May to November every year,especially from July to September.The disasters arising from typhoons have two types:direct and indirect.The direct disasters include flood disasters,geological disasters,houses collapsing,and storm tides etc;the indirect disasters include heavy rain,flood and geological disasters.In sometimes,east wind wave or cloud coming from sea can make heavy rain in short period,which may produce destructive flood or geological disasters.