YE Zhengwei,YIN Peng.Changes of Precipitation Concentration Degree and Precipitation Concentration Period in Flood Season in the Huaihe River Basin[J].Research of Soil and Water Conservation,2018,25(05):295-299.
淮河流域汛期候尺度降水集中度与集中期的时序变化特征
- Title:
- Changes of Precipitation Concentration Degree and Precipitation Concentration Period in Flood Season in the Huaihe River Basin
- Keywords:
- Huaihe River Basin; precipitation in flood season; precipitation concentration degree; precipitation concentration period
- 分类号:
- P932;P467
- 摘要:
- 降水分布的不均匀性特征是水循环研究的热点问题，也是区域旱涝防灾与水资源利用的重要依据。基于淮河流域30个气象测站点1960-2014年汛期（5-8月）的逐日降水数据，采用降水集中度指标、趋势与突变检测以及小波周期方法，分析了淮河流域近55 a来汛期降水集中特性的时序变化特征。结果表明：（1）汛期降水年际间波动频繁，变幅较大，1970s和1990s为汛期雨量偏低时期，而2000s以来是汛期降水量最高的时代。（2）降水集中度波动较大，呈微弱减小趋势，以1960s为最集中，1980s最低，1983年出现一次较为明显的突变过程。多年平均降水集中期出现于7月上旬的38候；集中期以1980s为最偏早，1990s以来都较为偏迟，在1990年为明显的突变过程，此后集中期总体推后。（3）集中度在1960s中期具有2 a左右的周期，在1991-2004年存在3~5 a左右的周期。集中期在1970s后段存在2 a左右短周期，而在1970-1982年存在显著的6~9 a左右稍长周期。集中度与集中期在1975-1985年还具有显著的4~5 a左右正相位共振周期。
- Abstract:
- Precipitation variability is a hot issue in the hydrological cycle field, and it is also the key reference for the flood and drought mitigation and water resources utilization. Daily precipitation data in the flood season of 30 meteorological stations in the Huaihe River Basin (HRB) from 1960 to 2014 were calculated. Based on the calculation of precipitation concentration index, precipitation concentration degree (PCD) and precipitation concentration period (PCP) were analyzed by the trend test methods and the wavelet analysis. The results showed that:(1) the inter-annual variation of precipitation in the HRB was large, it had a very slight increasing trend, less precipitation was observed in 1970s and the 1990s, but more precipitation was found ever since 2000s; (2) the PCD varied with an insignificant decreasing trend, the 1960s and the 1980s were the largest and lowest decades, respectively; an abrupt change of PCD occurred in 1983; the mean PCP occurred in the early July; the PCP was less in 1980s but larger since 1990s, there was an abrupt change in 1990 in the change of PCP; (3) a period of about 2 year could be checked for PCD and a period of about 3~5 years was quite stable from 1991 to 2004, a period of about 6~9 years was stable between 1970 and 1982, and a positive phase period of 4~5 years was significant for the PCD and PCP.
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备注/Memo
收稿日期:2017-10-09;改回日期:2017-11-06。
基金项目:国家自然科学基金面上项目（41471425）；江苏省教育厅高校哲学社会科学研究项目（2016SJB630122）；淮安市科技局重点研发计划项目（HAS2015005-1）；江苏省高校“青蓝工程”优秀青年骨干教师资助项目
作者简介:叶正伟(1973-),男,安徽黄山人,教授,博士,主要从事水文气象与自然灾害方面的研究。E-mail:leafyzw@163.com