A Case of Bank Protection With Palm Fiber Roll for Bare Slopes Revegetation on Dam Lake Flontage

27 Mar A Case of Bank Protection With Palm Fiber Roll for Bare Slopes Revegetation on Dam Lake Flontage

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Abstract

河川における植生護岸として大きな効果をあげているヤシ繊維ロールを用いて, ダム湖湛水斜面緑化を試みた。ヤシ繊維ロールを等高線方向に連続あるいは編柵状に固定し, ロール間等に耐冠水性植物を植え付けた。その結果, 施工後約2年間の観察では,(1) 構造的劣化はみられず,(2) 植物の流亡は少なく,(3) 生存率は安定し,(4) 樹高の増加傾向が認められた。 重機の使えない現場環境においては, 軽量で柔軟性があり, かつ強度のある植生基盤であるヤシ繊維ロールを用いた今回の工法は, 良好な植栽方法と思われた。

English Abstract

Revegetation of bare slopes on a dam lake frontage was tested with palm fiber roll, which has previously been a successful and efficient material on riverside plantings. Palm fiber roll was laid along the direction of the contour as a flat layer or an alter tive wickerwork. Observations, during the first 2 years following establishment, are that:(1) Both types of bank protection and materials have remained intact.(2) Few plantings have drifted.(3) Ratio of plant survival has stabilized.(4) Height of plantings has increased. In this instance, since it is difficult to use heavy machines, palm fiber roll seems an efficient material for the preparation and stabilization of planting ground because of its lightness, flexibility and strength. These prelimi ry observations suggest that both of these slope protection methods are potentially efficient for the revegetation of bare slopes on dam lake frontages.