Characteristics of rainfall in the Nishi-Chugoku mountains in Japan

Abstract

We tried to know the rainfall characteristics in the
Nishi-Chugoku mountains in western Japan analyzing the long term and intensive observation
period data of stations (12 stations) of AMeDAS, Kitahiroshima town, and
Hiroshima University.  As a result, we
obtained the following things:
1 The rainfall amount depends on the altitude and the geomorphological opening area ratio.
2 The drought year depends on the rainfall amounts in July and August.
3 The return period of the drought year was estimated to be within 10 years.
4 The higher altitude stations had the higher hourly rainfall intensity in a day.
5 There was no remarkable difference of the 10 minutes period rainfall among all the stations.