在气候处于少雨时期，极端干旱频率远高于多雨时期。
The frequency of extreme drought in the dry period is much higher than that in the wet period.
干旱、洪涝、霜冻、冰雹是山东省最主要的气象灾害，具有频率高、范围广、灾情重等特征。
Drought, flood, frost and hail are major meteorological disasters with the characteristics of high frequency, wide distribution and serious conditions etc. in Shandong Province.
确定了不同程度的干旱在区域上的分布特征及其发生频率。
The distribution and frequencies of drought in different degree were determined.
在我国，干旱的危害也是十分巨大，无论在影响的范围还是发生的频率上，旱灾均大于洪涝灾害。
In our country, the drought disaster is very serious, and drought's area and frequency are higher than flood's.
基于信息扩散理论提出直接估计低温冷害、干旱和洪涝的风险评估方法，以低温冷害为例，将计算结果与风险指数法和主观频率法做比较。
This research raised the method in risk assessment of low temperature and cold damage, drought and flood disaster based on information diffusion theory.
基于信息扩散理论提出直接估计低温冷害、干旱和洪涝的风险评估方法，以低温冷害为例，将计算结果与风险指数法和主观频率法做比较。
This research raised the method in risk assessment of low temperature and cold damage, drought and flood disaster based on information diffusion theory.
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