海岸林の時間的生長を考慮した津波減衰効果に関する数値解析

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  • Numerical Analysis on Tsunami Attenuation Effect of Coastal Forests Considering Their Temporal Developments
  • カイガンリン ノ ジカンテキ セイチョウ オ コウリョ シタ ツナミ ゲンスイ コウカ ニ カンスル スウチ カイセキ

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Variations of tsunami attenuation ability of coastal forests with stand age have been investigated by applying knowledge of forest ecology and tree morphology. The maximum resistance of a coastal forest against a tsunami flow is found to be realized at a certain age, because the size of individual trees increases with age whereas the resistance as the stand decreases with age as the result of self-thinning and heightening of tree crown area. Results on reaches of tree breakage show little difference for 20 and 40 years' old stand cases, because the individual tree durability momentum increases with stand age whereas the external momentum by tsunami flows also increases.

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