THE CHARACTERISTICS OF SPATIO- AND TEMPORAL-VARIATION OF RAINFALL IN MATSUYAMA PLAIN

摘要

The diurnal rainfall variation in Matsuyama plain was analyzed by using datasets from AMeDAS, MLIT (Ministry of Land, Infrastructure, Transport and Tourism), and the local government. The late afternoon peak of precipitation is particularly noticeable around the top of alluvial fan, especially in the warm season. The absolute humidity observations indicate that the sea breeze transports the moist air along the river toward the inland regions, and thus contributes to an increase in the water vapor content around the top of alluvial fan. This is one of the reasons for the intense precipitation around the top of alluvial fan.