1951-2009年丹东地区暴雨变化

Changes in Heavy Rain in Dandong During 1951-2009

利用丹东地区1951—2009年4个测站逐日降水资料,对丹东地区暴雨变化进行了分析。结果表明:丹东地区年暴雨日数和暴雨量呈减少趋势,汛期洪涝贡献率趋势变化不明显;2001—2009年6月份暴雨日数明显增多,7月份暴雨日数偏少,暴雨初期和终期提前。

Changes in heavy rain in Dandong were analyzed by using the daily precipitation data from the 4 meteorological stations of Dandong.The results indicate that both the annual heavy rain days and heavy rain amount in Dandong exhibited decreasing trends.However,the percentage of heavy rain amount to the total precipitation during the flood season from 1951 to 2009 showed no obvious trend.The heavy rain days increased obviously in June while decreased in July,and both the starting date and ending date came earlier in 2001-2009 than in the proceeding decades.