【摘要】 应用Hargreaves公式和Penman-Montieth公式计算了太子河流域1960-2005年间逐月参考作物腾发量。将Hargreaves公式计算结果与Penman-Montieth公式结果比较发现,年内3-10月份Hargreaves公式计算结果偏高,其余月份偏低。两方法夏季差异最大,冬季差异最小。相对湿度和风速是两方法差异的主要原因,经分析太子河流域相对湿度的影响更大。利用Hargreaves公式计算结果与PM公式计算结果之间良好的线性关系,对Hargreaves公式系数进行了地区修正。修正后的Hargreaves公式简单、准确,为辽阳市及其类似地区ET0的计算提供了新方法。更多还原

【Abstract】 Our research is an attempt to estimate monthly evapotranspiration in the Taizi River basin from1960 to 2005 by using the Hargreaves equation and Penman-Montieth equation.Hargreaves method is compared with PM method.The evapotranspiration is overestimated from March to October;it is underestimated in other months.The differences are the greatest in summer and the smallest in winter.Relative humidity and wind velocity are responsible for the difference between the two methods,but relative humidity has more impact on the Taizi River basin.Based on the linear relationship between Hargreaves eqation and PM eqation,modified models are established for stations.The modified Hargreaves equation is simple and accurate,thus offering a new way to estimate ET0 in Liaoyang and other areas.更多还原