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Study on the Changes of Different Intensity Precipitation in Henan Province and Their Effects on Flood and Drought Disasters

YU Wei-dong et al (Henan Institute of Meteorological Science,Zhengzhou,Henan 450003)  
Based on the daily precipitation data from 30 stations of Henan Province during 1957-2005,the change trend of different intensity precipitation and precipitation days in Henan Province in recent 49 years were calculated and analyzed.Combining with the disaster area of flood and drought in recent 49 years,the effects of different intensity precipitation on flood and drought were analyzed.The results showed that rainstorm days and heavy rain days in Henan Province had weakly increasing trend and moderate rain days and light rain days showed a decreasing trend.The linear trend of the decreasing light rain days had extremely significant difference at 0.01 level.Rainstorm amount,heavy rain amount and moderate rain amount had inapparent increasing trend and light rain amount showed a significant decreasing trend,with its linear trend reaching significant difference at 0.05 level.Both drought area and flood area showed the increasing trend and the linear trend of the increasing drought area passed the significant test at 0.01 level.Different intensity precipitation amount and precipitation days had significant correlation with drought and flood areas.The most significant related factors with drought were light rain amount and light rain days and that with flood were rainstorm quantity and rainstorm days.
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