1955～2014年本溪地区年降水量分析

利用本溪地区1955～2014年降水资料，采用线性回归方法对近60年该地区年降水量的变化规律及趋势进行分析。结果表明，近60年来本溪地区年降水量平均为66．1 mm，年降水量呈现逐年减少趋势，减少速率为2．23 mm／10 a；7、8月降水较多，占全年降水量的48．7％；12、1和2月降水较少，3个月之和仅占全年降水量的4．0％。各年代平均降水量总体呈现先下降后上升的趋势，但总体是减少的。春季和夏季的降水呈现上升趋势，秋季和冬季的降水呈下降趋势；降雨大多集中在主汛期，夏季降水是本溪地区降水的重要组成部分；冬季降水量最少，其次是春季、秋季。

Analysis of Annual Precipitation in Benxi Area from 1955 to 2014

By using the annual precipitation resources of Benxi Area in 1955-2014, linear regression method was used to analyze the change law and trend of annual precipitation in this area in recent 60 years.Results showed that the average annual precipitation in Benxi Area in recent 60 years was 66.1 mm.The annual precipitation showed a decreasing trend year by year, the decrease rate was 2.23 mm every 10 years.July and August had relatively abundant precipitation, accounting for 48.7% of the annual precipitation.In December, January and February, pre-cipitation was less in general.The sum of the three months only accounted for 4.0%of the annual precipitation.Precipitation in each year firstly declined and then increased, but was decreasing in general.Precipitation in spring and summer showed an increasing trend;while that in autumn and winter showed a downtrend trend.Precipitation mainly distributed in major flood period.Precipitation in summer was an important component of the precipitation Benxi area.Precipitation in autumn was the least, followed with spring and autumn.