HYDRAULIC RESISTANCE BY FLEXIBLE AND TALL PLANT COMMUNITIES

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  • HATTORI Atsushi
    国土交通省 国土技術政策総合研究所 河川研究部ダム研究室

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  • 流れによる変形を考慮した高茎草本植物の抵抗則
  • ナガレ ニ ヨル ヘンケイ オ コウリョ シタ コウケイ ソウホン ショクブツ ノ テイコウソク

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Tall and flexible plants such as common reeds are deformed by drag force of flood flow. This deformation, linked to flow resistance, affects flow velocity and depth. Drawing on this physical link, a model is developed to describe the deformation of plants and vertical profile of mean velocity and Reynolds stress of flow above and through flexible vegetation communities. The model is supported by real scale flume experiment using a common reed community. In addition, this work extends an estimation method of Manning's roughness coefficient for practical use by including the measured values that represent shape and strength characteristics of flexible plants.

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