基于降水集中度和集中期的浙江省降水时空变化特征分析  

Spatio-Temporal Variation in Precipitation in Zhejiang Province Based on PCD and PCP

作　　者：曹永强[1] 路璐[1] 张亭亭[1] 常静[1] 

机构地区：[1]辽宁师范大学城市与环境学院,大连116029

出　　处：《资源科学》2013年第5期1001-1006,共6页Resources Science

基　　金：水沙科学与水利水电工程国家重点实验室2012年对外开放基金(编号:sklhse-2012-A-02);国家973专题计划项目(编号:2010CB951102);国家自然科学基金(编号:51279072);辽宁省教育厅科技项目(编号:L2010239)

摘　　要：选取浙江省1960年到2009年50年3月-9月50个雨量站的逐日降水资料,运用小波分析、克里金插值等方法对研究区的降水集中度(PCD)和集中期(PCP)时空变化特征进行分析,并运用合成分析法对多水年和少水年的PCD和PCP进行合成分析。研究结果表明:浙江省PCD值变化于0.1～0.3之间,PCP值变化于213.09～240.92之间,说明浙江省降水较为均匀,且最大降水基本出现在8月7日左右,个别年份偏早或偏晚一些。周期变化中,PCD的主周期为20年左右,PCP的主周期为13年左右。PCD大体由西向东递增,说明相对于西部地区,东部地区的降水更为集中;PCP由北向南递减,说明浙江省南部大部分地区最大降水出现较早,北部一些地区最大降水出现略晚。多水年与少水年的降水集中度均由西北向东递减,可见无论多水年还是少水年,西北部地区的降水都比东部地区集中;多水年降水集中期的分布较分散,少水年降水集中期则由西北和东南两侧向中间递增,即在少水年西北地区和东南地区最大降水相对于中部地区早一些。Rainfall is rich in Zhejiang province and a better understanding of background and water resources are needed for water logging disaster relief work in the province. Based on daily precipitation data from 50 stations from 1960 to 2009, we analyzed spatial and temporal variation in the Precipitation Concentration Degree （PCD） and Precipitation Concentration Period （PCP）. The results show that the value 213.09-240.92. Precipitation is of PCD varies from 0.1-0.3, and the value of PCP varies between relatively uniform in Zhejiang, and the majority of precipitation appears in early August. PCD periodicity is approximately 20 y and the main cycle for PCP is 13 y. PCD increases from western to eastern Zhegiang. PCP descends from north to south, indicating that maximal precipitation appears earlier in southern Zhejiang. PCD in multi-water years and less-water years decreases from the northwest to east; precipitation in the northwest is more concentrated than in the east. The distribution of PCP in multi-water years is more dispersed; the distribution of PCP in less water years increases from the northwest and southeast to central Zhegiang.

关 键 词：降水集中度 降水集中期 小波分析 克里金插值 合成分析法 浙江省 

分 类 号：P468.024[天文地球—大气科学及气象学]