The Distribution of Heavy-Rainfall Frequency in Tohoku District

概要

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There are many studies on the geographical distribution of heavy rainfalls in Japan. In spite of the difference of definitions of heavy rainfall, the results well coincide that the areas where the occurrence is the most frequent are the coastal regions of Fukushima and Iwate Prefectures. The author reexamined the same problem using the data of recent ten years and obtained results as follows: 1) The concentrated heavy rainfalls apt to escape from the older observation network (Fig. 2). 2) The areas where the occurrence is the most frequent in Tohoku District are found in areas on the Japan Sea side (Fig. 3). 3) The areas, above 50% of the maximum rainfall amount are integrated to find the extent of heavy rainfall (Fig. 4). 4) The heavy rainfall in areas on the Japan Sea side has a tendency of concentrated precipitation pattern and in the coastal region on the Pacific Ocean side has a tendency of precipitation pattern elongated along the coast.
東北地理学会の論文