Abstract
In this paper, 30-years change of rainfall pattern in Miyazaki prefecture was analyzed with the spatial variability, using daily precipitation data from ten-AMeDAS weather stations. A clear increasing trend was found in annual precipitation. While the total amount of rainfall is increasing, number of rainy days has been signiicantly decreasing. This result supports some results of previous studies for long-term precipitation trends in other regions. In terms of seasonal trend, precipitation has obviously increased in fall, and has significantly decreased in spring. Summer precipitation has increased all but northern part of Miyazaki. Number of storm has decreased in spring and summer remarkably, while it has increased in other seasons. From agricultural aspect, much water is needed in this area in spring for paddy-rice planting, and therefore, the decrement trend of precipitation during the period may cause a shortage of irrigation water in the area.
