Study and simulation of the variability of diving evaporation in different sizes of evapotranspiration meters
In order to investigate the variability of phreatic evaporation measured by different small-diameter lysimeters and the simulation effect of the random forest regression model on phreatic evaporation,a comparison experiment of phreatic evaporation was carried out by using 0.3 and 0.5 m2 lysimeters in Wudaogou Experimental Station.The correlation of phreatic evaporation of two calibers of evapotranspiration meters was analyzed,and the phreatic evaporation of two calibers of lysimeters was simulated based on the random forest regression model,and the significance of the influence of different meteorological elements on phreatic evaporation was evaluated.The results showed that when the phreatic evaporation exceeds 2.393 mm,the phreatic evaporation measured by 0.3 m2 lysimeter was larger than that by 0.5 m2 lysimeter;there was a hysteresis effect in the diving evaporation measured by 0.3 m2 lysimeter.Net radiation had a greater effect on 0.3 m2 lysimeter phreatic evaporation,and among the effects of meteorological factors on 0.5 m2 lysimeter phreatic evaporation,40 cm soil water content had a greater effect.Air humidity and soil moisture were the main factors that lead to the difference in phreatic evaporation from 0.3 and 0.5 m2 lysimeters,and the random forest regression model could be used to predict phreatic evaporation through meteorological factors.
lysimeterphreatic evaporationcaliberrandom forest regression model
NETL
NSTL
万方数据
