| 基于分形理论的参考作物蒸发蒸腾量估算 |
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| 引用本文： | 战国隆,马孝义,刘继龙,吕静渭.基于分形理论的参考作物蒸发蒸腾量估算[J].灌溉排水学报,2010,29(1). |
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| 作者姓名： | 战国隆 马孝义 刘继龙 吕静渭 |
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| 作者单位： | 西北农林科技大学,旱区农业水土工程教育部重点实验室,陕西,杨凌,712100 |
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| 基金项目： | 国家自然科学基金项目(50879072);;国家科技支撑计划项目(2006BAD11B04);;国家863计划课题(2006AA100209) |
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| 摘 要： | 根据成都、雅安和乐山等站点实测的1954~2000年的气象资料和地理参数,建立了温度推算辐射的模型,从分形理论的角度,进一步揭示了温度和辐射的关系特征,并结合Penman-Monteith模型对参考作物蒸发蒸腾量(ET0)进行了估算。研究表明,温度(T)、净辐射(Rn)和净短波辐射(Qns)无标度区拐点的界限时间和分形维数非常接近,具有相似的分形特征,可利用T估算Rn和Qns;通过T估算的Rn计算的ET0的平均绝对偏差和平均相对偏差,均小于通过T估算的Qns计算的ET0的平均绝对偏差和平均相对偏差,而且偏差较小。因此,在实际应用中可通过T估算Rn来计算ET0,简化ET0的计算过程。
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| 关 键 词： | 温度 辐射 趋势分析 分形维数 |
The Reference Crop Evapotranspiration Estimation Based on Fractal Theory |
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| ZHAN Guo-long,MA Xiao-yi,LIU Ji-long,LV Jing-wei.The Reference Crop Evapotranspiration Estimation Based on Fractal Theory[J].Journal of Irrigation and Drainage,2010,29(1). |
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| Authors: | ZHAN Guo-long MA Xiao-yi LIU Ji-long LV Jing-wei |
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| Institution: | Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Education;Northwest A & E University;Yangling 712100;China |
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| Abstract: | According to the meteorological data and geographical parameters in 1954～2000,establishing a model of the radiation and temperature calculation based on fractal theory from the angle of further reveals that the relationship between temperature and radiation characteristics,combining Penman-Monteith model for reference crop the evapotranspiration (ET_0) estimated.Temperature(T)、net radiation (R_n) and net shortwave radiation (Q_(ns)) no-scaling regions and the boundary point of fractal dimension is close,with similar fractal characteristics,T estimate R_n and Q_(ns),Through T estimate R_n calculated ET_0 s mean absolute error and the average relative error less than,by estimating Q_(ns) calculated ET_0s mean absolute error and the average relative error,and deviation smaller.Therefore,in actual applications T can be used to estimate R_n,calculate ET_0,simplify the calculation process. |
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| Keywords: | temperature radiation trend analysis fractal dimension |
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