近50年雅安降水变化特征及小波分析

Characteristics Wavelet Analysis of Precipitation Variation in Ya′an in Recent 50 Years

分析四川省雅安地区50年(1961—2010年)的年降水以及月降水资料的降水变化规律得出:雅安地区年降水总量与每年降水量≥0.1mm的日数有逐年减少的趋势;每年最大日降水总量呈增加的趋势;降水量的变化规律在80年代末期发生明显的变化;雅安地区夏季降水量最大占全年降水的58.2%;冬季降水量最小占全年降水的4.3%,其中月降水总量在8月份最多,在1月份最少;年降水量2年的周期变化特征最为明显.

Based on the analysis of the annual precipitation in Ya′an area of Sichuan Province from 1961 to2010 and the precipitation variation of monthly precipitation data,it is concluded that the annual precipitation and the annual rainfall≥0.1 mm in Ya′an area have a decreasing trend;The maximum daily precipitation is increasing every year;the variation of precipitation changes obviously in the late 1980 s;the summer rainfall in Ya′an area accounts for 58.2% of the annual precipitation;the lowest precipitation in winter is4.3%,Of which the total monthly precipitation is the highest in August,at least in January;annual precipitation 2-year cycle characteristics of the most obvious.