Authors : Pramet Kaewmesri and Usa Humphries
Abstract: In this study, the Weather Research and Forecasting (WRF) model and the Coupling model between Weather Research and Forecasting with Regional Oceanic Model Systems (WRFROMS) model simulated rainfall over Thailand. The period time simulation was on the month of rainfall seasonal in 2015 and 2016. A sensitivity test was conducted to examine the performance of two different single moment microphysics schemes (Lin scheme and WSM6 scheme) for the rainfall simulation. The simulations were compared with the Tropical Rainfall Measure Mission (TRMM) grid data. The domain resolution for simulation was 15×15 km and covered the Thailand area. The results of rainfall simulation from WRF and WRFROMS given by the two microphysics schemes can be compared with the trend of rainfall spatial distribution from the TRMM data. On the spatial pattern, the WRF model both Lin scheme and WSM6 scheme were shown overestimation rainfall than observation data. On the other hand, the coupled model WRFROMS both Lin scheme and WSM6 scheme decreased rainfall closely TRMM observation than the WRF model. The overall results of the WRFROMS with the WSM6 scheme supported the lowest RMSE and MAE value than another scenario. However, in this study, the rainfall prediction cases were concluded the WRFROMS coupled model that can be used to simulate rainfall and SST over Thailand and gave a better performance that only the WRF model.
Pramet Kaewmesri and Usa Humphries, 2020. The Performance Rainfall Simulation over Thailand by using WRFROMS Coupling Model. Journal of Engineering and Applied Sciences, 15: 2112-2120.