Application of Priestley-Taylor Model in the Estimation of Water Surface Evaporation Covered by Spheres
To solve the evaluating problem of the water surface evaporation under the coverage of spheres,the P-T model coefficient α is calculated by the following two methods,based on the weights of changes in the overall surface energy balance components covered by spheres during the complete non-freezing period.(1)Bowen ratio β is introduced to establish the calculation formula of the P-T coefficient α1;(2)the P-T coefficient α2 is obtained by the linear fitting method across the origin,which taking the radiation term in the P-T formula as the independent variable,and the latent heat flux corresponding to the measured water surface evaporation as the dependent variable.According to the monthly change trend of Bowen ratio β and coefficient αduring the complete non-freezing period,the P-T model applied to the estimation effect of the water surface evaporation under the coverage of spheres was evaluated in the complete non-freezing period,odd months,and even months.The results show that the P-T model can better estimate the evaporation of the water surface covered by spheres,and the simulation effect of the P-T model corresponding to the coefficient α2(0.42～0.44)is better than the simulation effect of the P-T model corresponding to the coefficient α1(0.39～0.60).The conclusions of this study have reference value for scientific evaluation of evaporation prevention and water saving effect of plain reservoirs in arid areas covered by spheres.
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