Simulation modeling of potential evapotranspiration for irrigated sugarcane [study conducted in the Philippines]
1982
Early, A.C.
A computer simulation model was developed for daily mean potential evapotranspiration (PET) on weekly basis. The daily potential evapotranspiration data was estimated using the modified Penman equation, from 56-year historical hydrometeorogical data collected. The model was developed, primarily, based on the assumption that little variation occurs during a week. During the course of the model development, it was found that the occurrence of an isolated rainy days or a sequence of rainy days during a week is important, though the amount of rainfall has no significant effect on PET. The PET was found to be a random variable for any week of the year, normally distributed, and the weekly means of these distributions had a deterministic relationship with the respective weeks of the year. The model makes use of these properties of PET in generating the data for any number of years. It is flexible enough to encompass the seasonal variations that occur during a week due to rainfall
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