Abstract
A hydrological simulation model, the Tropical Hydrology Simulation Model 1 (Trophydsim-1), was created in order to simulate the run-off processes in mountainous terrain in a tropical monsoon region. The hydrological cycles in five major land covers, i.e., forest, upland, plantations (normally tobacco areas), paddy fields, and settlements were each analogized by a series of four storages representing interception, depression, upper-zone and lower-zone storages. A set of mathematical equations expressing empirical formula as well as physical laws were employed in the model. An automatic parameter optimization routine was presented.
