Variation Characteristics of Reference Evapotranspiration and Pan Evaporation During 1960 － 2009 in Shiyang River Basin

doi:10．11755/j．issn．1006－7639(2014)－04－0560

Abstract

Abstract:

Based on the daily meteorological data of 5 weather stations in Shiyang river basin during 1960－2009，the change trends of pan evaporation and reference evapotranspiration and their cause were analyzed by using estimation model and statistical method． The results showed that the evapotranspiration of Shiyang river basin had an increasing trend in the past 50 years，and in some observational stations it had an extremely significant increase． There was a certain influence on the results of evapotranspiration analysis in different periods of 1960－2009 and 1970－2009． According to theoretical analysis of estimation models，it was thought that the change of reference evapotranspiration calculated by Thornthewaite method mainly determined by the temperature，while the pan evaporation and reference evapotranspiration calculated by Penman－Monteith formula were resulted from interactions among radiation，temperature，wind speed and vapor pressure deficit．Meanwhile，the results of the correlation analysis and mutations test verified the conclusion from above，and it was also concluded that the mainly determinant factors of the change of the pan evaporation and reference evapotranspiration in Shiyang river basin in the past 50 years was vapor pressure deficit．

Key words: reference evapotranspiration, pan evaporation, Shiyang river basin, Penman － Monteith formula, Thornthewaite method

摘要：

以石羊河流域5个气象站点1960～2009年逐日气象资料为基础，从估算模型和统计角度计算分析了该流域参考蒸散量及蒸发皿蒸发量的变化趋势和变化原因。结果表明：过去50 a石羊河流域蒸散发呈增加趋势，个别站点达极显著水平(p＜0．01)，1960～2009年和1970～2009年不同时段的选择对分析结果有一定的影响。估算模型理论分析认为桑斯威特法计算的参考蒸散量变率主要由气温决定，蒸发皿蒸发量和彭曼蒙蒂斯公式计算的参考蒸散量变化则是辐射气温风速及空气饱和差共同作用的结果，而相关分析和突变检验的分析结果验证了上述结论，并得出过去50 a石羊河流域蒸发皿蒸发量和彭曼蒙蒂斯公式计算的参考蒸散量变化的主要决定因素是空气饱和差。

关键词: 参考蒸散量, 蒸发皿蒸发量, 石羊河流域, 彭曼蒙蒂斯公式, 桑斯威特法

CLC Number:

S161.4

ZHAO Funian，ZHAO Ming，WANG Ying，ZHANG Pengfei. Variation Characteristics of Reference Evapotranspiration and Pan Evaporation During 1960 － 2009 in Shiyang River Basin[J]. Journal of Arid Meteorology, DOI: 10．11755/j．issn．1006－7639(2014)－04－0560.

赵福年，赵铭，王莺，张鹏飞. 石羊河流域 1960~2009年参考蒸散量与蒸发皿蒸发量变化特征[J]. 干旱气象, DOI: 10．11755/j．issn．1006－7639(2014)－04－0560.

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