首页> 外文期刊>Engenharia Agrícola >Média diária do déficit de press?o de satura??o do vapor d'água do ar e sua influência na vapotranspira??o de referência pelo modelo de penman-monteith (FAO 56) em Piracicaba - SP
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Média diária do déficit de press?o de satura??o do vapor d'água do ar e sua influência na vapotranspira??o de referência pelo modelo de penman-monteith (FAO 56) em Piracicaba - SP

机译:天然气蒸汽饱和度赤字的日平均水平及其对Piracicaba - SP的博士 - 蒙特思(FAO 56)模型对参考Vapotranspira的影响

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摘要

The results of the evapotranspiration obtained with the Dair_avg proceeding from 14 methods were evaluated, by using the lysimetric measures of a sward. These comparisons allowed to separate the Dar_avg calculating methods into three groups: a group always resulted into an overestimate ETo; in other one always tended to underestimating the ETo; and in the last tended to overestimating the low values (<4.5 mm day-1), while underestimating the high values of ETo. No significant statistical differences were observed (t test; p <0.05) in ETo as a function of the Dair_avg methods, when using the hourly average of the temperature and/or the air relative humidity in relation to those determined with the average of the maximum and minimum values of these elements. Among the methods proposed by paper FAO56, just the one using the average relative humidity to calculate the actual pressure (ea) showed a satisfactory estimate. The best estimates of ETo were obtained with the Dair_avg methods using the average of the air temperature in the determination of the saturation pressure (es) and the average of the relative humidity for the actual pressure (ea). The use of saturation-vapor-pressure deficit of the air at a single time (from 9 or 10 a.m. local) as a representative of Dair_avg showed to be a satisfactory alternative in estimating the ETo under the climatic conditions of Piracicaba, SP, Brazil.
机译:通过使用草地的溶血性测量评估了通过从14种方法进行的Dair_avg进行的蒸发蒸腾的结果。这些比较允许将DAR_AVG计算方法分为三组:一组总是导致高度高估的ETO;在其他人中,总是倾向于低估了eto;在最后倾向于高估低估低值(<4.5mm-1),同时低估了Eto的高值。在EtO中没有观察到显着的统计差异(T测试; P <0.05)作为Dair_avg方法的函数,当使用温度和/或空气相对湿度的每小时平均值与最大值的平均值确定的那些和这些元素的最小值。在通过纸FaO56提出的方法中,只有使用平均相对湿度来计算实际压力(EA)的一个令人满意的估计。使用达妥_的最佳估计是使用达妥_AVG方法获得的,使用空气温度的平均值测定饱和压力(ES)和实际压力(EA)的相对湿度的平均值。使用饱和 - 蒸汽压力缺陷在一段时间(局部9或10:10)作为Dair_avg的代表显示是估算巴西的Piracicaba气候条件下的eto令人满意的替代方案。

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