| 潜在腾发量的季节性变化趋势及概率分布特性研究 |
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| 引用本文： | 罗毅,雷志栋.潜在腾发量的季节性变化趋势及概率分布特性研究[J].水科学进展,1997,8(4):308-312. |
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| 作者姓名： | 罗毅 雷志栋 |
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| 作者单位： | 清华大学水利水电工程系 北京100084 |
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| 基金项目： | 国家自然科学基金;“八五”重大项目资助(No.49391604) |
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| 摘 要： | 利用北京昌平气象站多年系列观测资料和世界粮农组织(FAO)建议的公式计算了历年各月逐旬潜在腾发量的平均值(ETp).通过分析表明,潜在腾发量呈明显的季节性变化趋势。潜在腾发量的多年均值和标准差(STD)都能用Fourier级数的二阶分量来作很好的近似。潜在腾发量是一个随机变量,其随机变化规律服从正态分布,该分布的均值和标准差都随着季节而变化。
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| 关 键 词： | 潜在腾发量 概率分布 季节变化 |
| 收稿时间： | 1996-07-10 |
Seasonal Variation Trend and Probability Distribution Pattern of Potential Evapotranspiration |
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| Luo Yi,Lei Zhidong,Yang Shixiu.Seasonal Variation Trend and Probability Distribution Pattern of Potential Evapotranspiration[J].Advances in Water Science,1997,8(4):308-312. |
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| Authors: | Luo Yi Lei Zhidong Yang Shixiu |
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| Institution: | Dept.of Hydraulic Engi., Tsinghua Univ., Beijing 100084 |
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| Abstract: | Based on the serial meteorological data from Changpin Meteo rological Stations located in the suburb of Beijing the every ten-day period average potential evapot ranspiration(ETp)were calculated and analyzed.The analysis shows that the ETp changes in a strong seasonal trend of which the mean and STD fit to the two-harmonics of Fourier series approximately.Moreover,ETp is a random variable which follows the normal distribution with mean and deviation changing with season.Finally,the probability density function of ETp is given. |
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| Keywords: | potential evapotranspiration probability distribution seasonal variation |
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