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| 桂林市汛期降水集中度和集中期与旱涝关系的研究 | |
| 引用本文： | 蒋丽娟,施能,周文志,邱奕炜.桂林市汛期降水集中度和集中期与旱涝关系的研究[J].气象研究与应用,2007,28(3):23-26. |
| 作者姓名： | 蒋丽娟 施能 周文志 邱奕炜 |
| 作者单位： | 1. 南京信息工程大学,江苏,南京,210044;桂林市气象局,广西,桂林,541001 2. 南京信息工程大学,江苏,南京,210044 3. 桂林市气象局,广西,桂林,541001 |
| 摘 要： | 利用桂林13站近50a的逐日降水资料,采用近年来气象学者提出的降水集中度和集中期的定义,计算桂林汛期降水集中度和集中期,对其统计特征进行分析,结果表明:降水集中度最大值为0.59,最小值为0.12,平均值为0.33,年际变化大,有10a的变化周期;降水集中期出现在汛期第5旬到第8旬之间的年份占76%。对集中度大值年和小值年进行对比分析,得出汛期降水量偏多时,集中度偏大容易造成洪涝灾害,集中度偏小则降水较均匀,不利于洪涝的形成。多水年和少水年降水集中度的空间分布明显不同,多水年的集中期明显比少水年偏迟。 |
| 关 键 词： | 降水集中度 降水集中期 统计特征 洪涝灾害 |
Research on the Relationship between PCD/PCP and Flood/Drought in Flood Season in Guilin |
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| JIANG Li-juan,SHI Neng,Zhou Wen-zhi,QIU Yi-wei.Research on the Relationship between PCD/PCP and Flood/Drought in Flood Season in Guilin[J].Journal of Guangxi Meteorology,2007,28(3):23-26. | |
| Authors: | JIANG Li-juan SHI Neng Zhou Wen-zhi QIU Yi-wei |
| Abstract: | Based on the daily precipitation data of last 50 years at 13 stations in Guilin,the precipitation concentration degree(PCD) and precipitation concentration period(PCP) are calculated and their characteristics are analyzed.Results show that the mean PCD is 0.33,with the maximum of 0.59,with the minimum of 0.12,and the PCD approximately takes 10a as a cycle.The PCP appears in the fifth dekad and the sixth dekad in 76% of the years.In flood season the more precipitation accounts is the greater PCD is,which is available to cause flood disaster.And small PCD is often close to even precipitation with no flood.The PCD of more precipitation and less precipitation have obviously difference in the spatial distribution and the PCP is later in rainy years than in dry years. |
| Keywords: | Precipitation-concentration degree(PCD) precipitation concentration period(PCP) statistical feature flood disaster |
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