HIERARCHICAL TIME-SCALE STRUCTURE IN DEPENDENCY OF RAINFALL DISTRIBUTION ON TOPOGRAPHY

Abstract

Temporal and spatial variability of rainfall distribution over mountainous area is very complicated particularly in Japan. However if hierarchical time-scale structure in dependency of rainfall distribution on topography is taken into the consideration, it is possible that rainfall distribution in time scale greater than a boundary scale is almost uniquely expressed by topographical features. In this study, by analyzing data observed by radars in the southern part of Kyusyu and in K: inki district, it is made clear that the rainfall distribution over mountainous area has a hierarchical time-scale structure, and it is also attempted to explicate the characteristic of hierarchical structure by considering the relation to type of rainfall event.