| 西安地区旱涝气候的长期变化 |
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| 引用本文： | 李兆元,吴素良,杨文峰,陈建文,王玉玺,余 兴.西安地区旱涝气候的长期变化[J].气候与环境研究,1997,2(4):356-360. |
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| 作者姓名： | 李兆元 吴素良 杨文峰 陈建文 王玉玺 余 兴 |
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| 作者单位： | 陕西省气象科学研究所，陕西省人工影响天气中心 |
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| 摘 要： | 根据西安丰富的历史旱涝史料，建立了近１５００年旱涝序列，并采用滑动滤波、功率谱分析、谐波分析等方法，对西安地区旱涝气候的长期变化进行分析。
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| 关 键 词： | 旱涝气候 长期变化 |
Long-Term Variation of Drought / Flood in Xi'an Area |
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| Li Zhaoyuan,Wu Suliang,Yang Wenfeng,Chen Jianwen,Wang Yuxi and Yu Xing.Long-Term Variation of Drought / Flood in Xi'an Area[J].Climatic and Environmental Research,1997,2(4):356-360. |
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| Authors: | Li Zhaoyuan Wu Suliang Yang Wenfeng Chen Jianwen Wang Yuxi and Yu Xing |
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| Abstract: | Based on historic data in Xi'an area, time series of drought/flood index close to 1500 years was established. And its long-term variation was analysed by using methods of moving flitering, power spectrum and harmonic analysis. Within 1500 years, 967 droughts and floods happened, it is 64.7% of total number of year. In these years, 611 drought and serious drought happened, it include 495 drought and 116 serious one which took place every 3 years and 12.8 year. In this period, 356 floods including 253 normal floods and 103 serious floods happened every 5.5 years and 14.5 years, and 528 normal years took place 2.8 years. The results of power spectrum of time series showed that the periods of 27 years and 70 years, from 10 to 11 years, and from 2 to 3 years were remarkable, the variation of drought/flood was fluctating, except in 19, 20 century, the number of drought was greater than that of flood. From the 6 to 15 century, drought frequantly happened, especially in the 7, 11, 15 century, the number varied from 45 to 54. From the 16 to 20 century, the number decreased, changing betmeen 31 and 38. Otherwise, variation of flood was rapid, the number of flood changed from 12 in the 6 century to 35 in the 8 century,and decreased from 35 to 15 in the 12 century, increased from 15 to 37 to the 20 century, especially in the 19, 20 century, flood happened a lot. There evisted alternate decade variation in long-term variation of drought/flood, and did successive decade variation. Duration of drought was longer than that of flood from the 6 century to 1650, and the probability of flood was longer than that of drought from 1650 to 1960. |
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| Keywords: | drought/flood long-term variation |
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