Abstract:

Based on rainstorm processes and disaster data in Liaoning proince from 1951 to 2012, characteristics of rainstorm disaster and its assessment were analyzed. Relationship between disaster-causing index and assessment of disaster effect was investigate using a statistic analysis method. The?results?show?that the number of annual average rainstorm days in Liaoning province gradually reduces from southeast to northwest during 1951 to 2012. Frequency of rainstorm disaster gradually increases from the middle to northwest, especially in the western Liaoning province, for example, rainstorm disasters account for 73% of total rainstorm events in Kazuo County of Chaoyang. Rainstorm frequency is high and precipitation intensity is weak in the western of Liaoning province, while it is contrary in other areas. Also, probability of rainstorm disaster with the first and second grades is lower in the west than other areas. Effect of rainstorm disaster on crop and its facilities is most significant. Frequency of affected disaster is the highest in Liaoyang area, and it is 95% of total disaster events. Rainstorm disaster can be divided into three grades, i.e. high area, middle area and low area.

Key words: Disaster-causing index, Rainstorm disaster, Pre-assessment of effect, Policy decision meteorological service