1)  disaster frequency
灾次
2)  disaster frequency index
灾次指数
1.
Firstly, the repeated occurrence of single disaster andthe grouped occurrence of multiple disastersare are quantified by disaster frequency index D_i and disaster categoryindex and the method to calculate D_i' and D_i' is presented.
首先用灾次指数D_i和灾种指数D_i′来量化单灾种的多发性和多灾种的群发性,提出了计算D_i和D_i′的方法,然后在此基础上建立了量化灾情强度指数Q的模型,该模型适用于单区域和多区域中多种灾害发生的情况。
3)  fire event numbers
火灾次数
1.
According to the analysis of fire event numbers in some years in Nanjing, the attempt to simulate fire event numbers for deferent levels of fire risk early warning by using Poisson distribution is proposed.
本文根据对南京市多年火灾次数的分析 ,提出可利用泊松分布对不同火险预警等级中的火灾次数进行模拟的设想 ,从而使城市火险预警的内容得到进一步扩
4)  ratio of disaster loss to frequency
灾次比
5)  average disaster occurrence
均灾次
6)  average flood times per year(AFT)
年均水灾次
1.
Based on the average flood times per year(AFT) with the statistic unit "county", this paper presented the Chinese flood disaster spatial patterns from the digital flood disaster maps of China, which come from different information sources and divided into different periods.
以县域为基本统计单元,以年均水灾次为基本指标,在数字地图技术支持下,编制了一套信息来 源不同、时段相对连续的中国水灾格局图。
参考词条
补充资料:三灾──小三灾
【三灾──小三灾】
  ﹝出法苑珠林﹞
  [一、饥馑灾],谓人寿八万四千岁时,历过百年,人若生时,寿减一岁,如是人寿减至三十岁时,天不降雨,由大旱故,草菜不生;思欲见水尚不可得,何况饮食。以是因缘,世间人民,饥馑死者,其数无量,是名饥馑灾。
  [二、疾疫灾],谓人寿减至二十岁时,有大疾疫,种种诸病,一切皆起。以是因缘,世间人民,疾疫死者,其数无量,是名疾疫灾。
  [三、刀兵灾],谓人寿减至一十岁时,诸人各起斗诤,手执草木,即成刀仗;由此器仗,互相残害。以是因缘,世间人民,刀兵死者,其数无量,是名刀兵灾。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。