草方格原理を応用した石炭灰造粒物基盤の侵食防止工  [in Japanese] DEVELOPMENT OF A NEW COUNTERMEASURE FOR EROSION OF THE ARTIFICIAL BED MATERIALS MADE OF FLY ASH BEADS  [in Japanese]

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Abstract

アマモ場再生に有効な石炭灰造粒物基盤の侵食を回避するために,砂漠緑化に使用される草方格原理を応用した侵食防止工を検討した.水理模型実験において,考案した侵食防止工は波による石炭灰造粒物の水平移動を妨げ,その設置間隔を底面軌道振幅以下に設定することで,基盤面の侵食を抑えられることが明らかとなった.また,実海域の石炭灰造粒物基盤に侵食防止工を適用した結果,基盤表面の変位量が対照区よりも小さくなり,その有効性が実証できた.

 A new countermeasure for erosion of the artificial bed materials made of fly ash beads was developed based on the principle of straw checked-board. The developed countermeasure has a permeable structure around which large eddies cannot be generated and should be placed with a suitable distance apart each other. The hydraulic physical model test was conducted to determine the suitable distance and to investigate the wave conditions under which the countermeasure is effective. The suitable distance was found to be less than excursion length of water particle at the bed. The field test was conducted to confirm the performance of the developed counter measure in Hiroshima Port, Japan.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 70(2), I_774-I_779, 2014

    Japan Society of Civil Engineers

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