Improved method for daily evapotranspiration prediction
Shixiang Gu, HE Da-ming · Journal of Hydraulic Engineering · 2005
The Penman-Monteith equation is applied to analyze the daily evapotranspiration ET_0 variation of 6 stations located at different longitudes and latitudes as well as different elevations based on the historical meteorological data.In the analysis,instead of 10 days as a period the weather classification correction coefficients in calculated according to the statistics based on every day,and a fuzzy subset based on the Zadeh operator is introduced to judge the fuzzy group calculation of daily weather classification correction coefficient.The modified prediction model has been successfully used to predict the ET_0 of Jinghong Irrigation District in 1998 and Dianchi Irrigation District in 2000.The result demonstrates the prediction precision of the proposed model is better than that of artificial neural network model using radial-basis function and experiential concept model.