【摘要】 运用楚雄市1961~2009年的降水量资料,通过统计检验、五点三次滤波法并计算了楚雄降水距平百分率,分析了楚雄市旬、侯、月﹑季、年际降水量变化特征及旱涝灾害的时间分布特征,得出楚雄市49年平均降雨量为867.77 mm,2000~2009年来年平均降雨量为935.57 mm,比49年均值偏高67.8 mm,呈上升趋势。降水主要集中在5~10月,干湿明显,楚雄市冬春干旱年年都有发生,只是程度不同,初夏干旱如遇大气环流异常发生的机率较大,干旱发生连续性较强,洪涝灾害偶有发生。并对旱涝灾害成因进行了分析,提出了旱涝灾害防治基本对策。更多还原

【Abstract】 Based on the meteorology data of precipitation during 1961 ~ 2009,this paper used statistical test and five-point three-times filtering method,then calculated the anomalous percentage of precipitation in Chuxiong City.Finally,this paper analyzed the variation of precipitation on different time scales,and analyzed the time distribution characteristics of drought and flood disasters.The results show that the average annual precipitation in the past 49 years in Chuxiong is 867.77 m,the average annual precipitation in recent 10 years is 935.57 m,which is higher than the average annual precipitation(67.8 m) in the past 49 years,showing an ascending trend.Precipitation is mainly concentrated in May to October,and shows the characteristics of dry and wet weather obviously.There happen droughts in winter and spring every year,but the difference is merely is the degree.There is a big probability that droughts happen in early summer when general atmospheric circulation is abnormal,and the continuity of drought is fairly strong,but flood disasters happen occasionally.On the other hand,we also analyzed the cause of drought and flood disasters,and put forward the basic countermeasures to prevent drought and flood disasters.更多还原