| Cite this article: | 李兵.湖南省资水流域汛期暴雨气候特征分析[J].灌溉排水学报,0,():-. |
| libing.湖南省资水流域汛期暴雨气候特征分析[J].灌溉排水学报,0,():-. |
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| A study on climatic features of heavy rain over Zishui river basin in Hunan province during flood season |
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libing
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Yiyang Meteorological Bureau
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| Abstract: |
| 【Objective】In order to have a better understanding of the climatic features of heavy rain over Zishui river basin in Hunan province from 1980 to 2016 during flood season(April to September).【Method】By using of EOF decomposition、Global Moran Index、?Mann-Kendall test,the spatial and temporal evolutionary characteristics of heavy rain over Zishui river basin in Hunan province were studied in the present paper.Probability of heavy rain of each national meteorological observatory were also calculated according to statistical theory.Some useful conclusions were obtained as followed.【Result】(1)Spatial distribution of number days of heavy rain over Zishui river basin is inhomogeneous which is greater in the middle and down stream than the up stream.(2)There are two kinds of typical modes for heavy rainfall under EOF decomposition,namely the whole region,north-south.There are fewer heavy rain and negative Global Moran Index in 1980s.(3)The number days of heavy rain and rainfall both have increasing tendency, the mean value of climatic growth rate are 0.1 day and 13.1 millimeter per 10 years respectively. (4)Heavy rainfall over Zishui river basin is highly concentrated in time,the mean precipitation concentration degree(PCD) of heavy rain is 0.82.The mean precipitation concentration period(PCP) is June 26th.(5)There are lower probability of heavy rain over Zishui basin in 10 days during flood season.The mean probability of heavy rain in 20、30 days are 23.1%、32.2% respectively. On average, the heavy rain center Anhua county has upper probability, the probability of heavy rain in 20、30 days are 39.1%、46.0% respectively. |
| Key words: Hunan Province; Zishui river basin; heavy rain |
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