Sediment disasters by the Typhoon Meari (T0421) in Miyagawa village, Mie Prefecture in Southwest Japan

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  • 2004年台風21号による三重県宮川村の土砂災害
  • 2004ネン タイフウ 21ゴウ ニ ヨル ミエケン ミヤガワムラ ノ ドシャ サイガイ

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Abstract

The Typhoon Meari (T0421) passed through northern Mie Prefecture September 28 to 29, 2004. Many landslides and slope failures occurred by the heavy rainfall during the Typhoon in Miyagawa village. Using aerial photography, we examined 233 landslides and slope failures from the points of geology, totalr ainfall, and total rainfall intensity-most were slope failures. The frequency distribution of landslides and slope failures in the Sanbagawa and Chichibu belts were not significant. It was clear that a larger number of slope failures occurred in the areas where the hourly rainfall was in the 110-120-mm range. However the slope failures were not dependent on accumulated rainfall. In the Sanbagawa belt, many slope failures were generated in dip slope areas. While in the Chichibu belt many of the slope failures were generated in reverse dip slope areas. The heavy rainfall and weathering were generally restricted to the surface, so slope failures occurred rather than landslides.

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