広島大学総合科学部紀要. IV, 理系編 Volume 28
published_at 2002-12

広島県瀬戸内海沿岸域の降雨特性 : 降雨時間帯、季節性、降雨強度

Rainfall properties in Setouchi region, Hiroshima ; rainfall time, seasonality and intensity
成岡 朋弘
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Abstract
For predicting the timing or intensity of nitrate loss, sediment yield and flood in Seto Inland Seacatchments, we confirmed rainfall properties there by using hourly rainfall data at Shimo-Kamagari Island andMiyajima Island. The average annual precipitation is about 1100 mm and 1600 mm at both islands, respectively.Total rainfall at the events of more than 30 mm exceeded 50 0f the total annual rainfall at both sites. From theresults analyzed rainfall time, the peaks of rainfall intensity were found around 6 AM and 5 PM. Timing ofrainfall was controlled by rainfall mechanisms and landform characteristics. Maximum hourly rainfall intensitywas similar at both sites during a big event of more than 70 mm.
Keywords
rainfall
Setouchi region
time
seasonality
intensity