ペンマンの蒸発散位と実蒸発散量に関する研究

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Evapotranspiration was studied by Heat Balance Bowen's Ratio Method on a grassland of Faculty of Agriculture, Kochi University from December 27, 2001 to January 24, 2002. By simple and multiple regressional analyses, the following relationships are gotten. Y=0.077+0.313X (r^2=0. 894, s=0.183, n=29) where, Y : evapotranspiration (mm/d), X : net radiation (MJ/m^2/d). Y=0.241+0.152X (r^2 = 0.875, s=0.198, n=29) where, Y : evapotranspiration (mm/d), X : global solar radiation (MJ/m^2/d). Y=-0.828+0.162X_1+0.189X_2+0.0107X_3 (R^2=0.902, s=0.182, n=29) where, Y : evapotranspiration (mm/d), X_1:global solar radiation (MJ/m^2/d), X_2:daily mean wind velocity at 3.5m above the ground (hereafter, referred as the daily mean wind velocity, m/s), X_3:daily mean relative humidity as the mean of 3m and 1m above the ground (hereafter, referred as the daily mean relative humidity, %). Y=-2.25+0.512X_1+0.0127X_2+0.0261X_3+0.516X_4 (R^2=0.989, s=0.190, n=29) where, Y : evapotranspiration (mm/d), X_1 : global solar radiation (MJ/m^2/d), X_2 : daily mean temperature as the mean of 3m and 1m above the ground (hereafter, simply referred as the daily mean temperature ℃), X_3 : daily mean wind velocity (m/s), X_4 : Penman's daily potential evapotraspiration at 3m above the ground (mm/d). Y=0.55+0.483X(R^2=0.968, s=0.304, n=29) where, Y : net radiation (MJ/m^2/d), X : global solar radiation (MJ/m^2/d), Y=1.68+0.191X_1+0.0722X_2-0.0286X_3+0.308X_4(R^2=0.994, s=0, n=29) where, Y : Penman's daytime potential evapotranspiration at 3m above the ground(mm/d), daytime : the hours while the net radiation is positive, X_1 : net radiation (MJ/m^2/d), X_2 : daytime mean temperature at the height of 3m above the ground(℃), X_3 : daytime mean relative humidity at the height of 3m above the ground(%), X_4 : daytime mean wind velocity (m/s). By using the class A pan and 20cm diameter pan, pan evaporations were studied at the other grassland of the campus at noon from October 1, 2001 to January 24, 2002. The relationship is expressed by the following formula. Y= 0.9672X (s=1.016, n=116) where, Y : pan evaporation of class A pan measured (mm/d), X : pan evaporation of 20cm diameter pan measured (mm/d). The above coefficient 0.9672 is far from those of passed studies' 0.6 to 0.8. The cause is not clear yet
2002-12-25

ペンマンの蒸発散位と実蒸発散量に関する研究

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