SIMULATION OF VAPOR AND HEAT FLUXES OVER WET AND DRY REGIME IN PADDY FIELD ENVIRONMENT

Alternating dry-wet paddy field management such as System of Rice Intensification (SRI) had become an interesting subject in research and development in paddy cultivation which also been subject for trial for its implementation. The field's environment's variation of biophysical parameters related to production had also become important to be studied. This study aims to simulate the variation of evaporation and thermal condition over a wet and dry regime of paddy field. The simulation model used in this study was a combination of numerical surface energy balance and soil water flow model consisting two layered resistance energy balance model for non-ponded field, one-dimensional atmospheric boundary layer model of wind, temperature and vapor changes, and soil heat transfer and soil water flow models. Meteorological parameters at the site were measured and utilized as input for the simulation. The simulation shows the fluctuating latent, sensible and ground heat flux and also the variation of temperature, and soil condition for wet and dry regime of paddy field