2004 Volume 48 Pages 289-294
The purpose of this research is to analyze rainfall-topography relationships and determine their physical mechanism by running numerical simulations under ideal conditions using mesoscale model MM5. The model was set up including an isolated mountain with a triangular section as the ideal topography. The relation between topographic elevation and simulated rainfall amount was investigated using the stratified sampling method. As a result, it was found that the rainfall-topography relationships on an isolated mountain can be described with a Gaussian-type function, and their mechanism was clarified by investigating the development process of convective cells. It was also determined how the parameters of the function vary with topographic conditions and horizontal speed of the prevailing wind.
