Rainfall condition triggering subsurface flows spouting from pipe exits in torrent bed material of the Nishinokaito River in Mount Fujiwara, Mie prefecture, Japan

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  • SATO Hirofumi
    Forest Conservation Division Sinshiroshitara Agriculture, Forestry,and Fisheries office, Aichi Prefectural Government
  • YAMADA Takashi
    Graduate School of Bioresouces., Mie Univ.
  • HANADA Koichi
    Kyonan Forestry and Environment Branch Office, Yamanashi Prefectural Governmenr
  • HIRAYAMA Kenji
    Transportation Infrastructure Department, Shizuoka Prefectural Government
  • HORIUCHI Nozomi
    Ise Agriculture, Forestry, Fisheries, Commerce, Industry and Environment Office, Mie Prefectural Government

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Other Title
  • 三重県いなべ市藤原岳西之貝戸川での渓床堆積物におけるパイプ孔の存在と豪雨中のパイプ流発生・非発生降雨条件
  • ミエケン イナベシ フジワラダケ ニシユキガイ トガワ デ ノ ケイショウ タイセキブツ ニ オケル パイプコウ ノ ソンザイ ト ゴウウ チュウ ノ パイプリュウ ハッセイ ・ ヒハッセイ コウウ ジョウケン

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Abstract

The hydrological process for the behavior of subsurface flows is not well understood in a torrent bed material during heavy rainfall. To elucidate this process, it is important to understand and predict the debris flow generation mechanism. Herein we report the results of subsurface flows spouted torrent bed materials as well as the occurrence and nonoccurrence conditions in the Nishinokaito torrent, Mount Fujiwara, Inabe-shi, Mie prefecture, Japan. Several pipe exits were discovered in a torrent bed material. They were emplaced in a sand and gravel layer between 1.0 and 1.5 m below the surface of the torrent bed material. The gravel supported the internal walls of the pipe exits. Subsurface flows spouted when the rainfall intensity exceeded 5 to 7 mm in 10 minutes and the soil water index exceeded 110 mm.

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