A study on regional extreme precipitation events and the exposure of population and economy in China
Based on daily precipitation data (1960-2014) collected at 771 meteorological stations over China,the 95th percentile of effective precipitation is selected to be the extreme precipitation threshold.A regional precipitation event is identified to be an extreme precipitation event if it exceeds the threshold over a continuous area at a given time scale.By taking into account the spatial and temporal continuity characteristics of extreme precipitation events,the Intensity-Area-Duration (IAD) method is applied to study the feature of regional extreme precipitation event at different durations and the population/GDP exposed to extreme precipitation events.The research results show that:(1) regional extreme precipitation events with maximum relative intensity mainly occurred in three periods:1960-1968,1991-1999 and 2006-2013;(2) the centers of extreme precipitation events are largely distributed in Northeast China and to the south of the Yangtze River,while single-day extreme precipitation events mainly occurred in the northern region and multi-day extreme precipitation events mostly occurred in the southern region;(3) the areal coverage of extreme precipitation events has increased significantly during 1960-2014,but no obvious change can be detected for the relative intensity of extreme events;(4) the population and GDP exposed to extreme precipitation events have shown a significant increasing trend.The population exposed to extreme precipitation events reached 24.08 million people/d in 1983,and the GDP exposed to extreme events reached 2 billion yuan/d in 1998.
Extreme precipitation eventsIAD methodPopulation and economyExposureChina
国家科技期刊平台
NSTL
万方数据
维普
