協働モニタリングによる沖縄本島億首川ダム直下マングローブ林の河床変動特性の把握

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  • CHARACTERISTICS OF BED-LEVEL FLUCTUATION BASED ON COLLABORATIVE MONITORING AT MANGROVE FOREST DOWN THE DAM IN OKUKUBI RIVER, OKINAWA
  • キョウドウモニタリング ニ ヨル オキナワ ホントウ オクシュガワ ダム チョッカ マングローブリン ノ カショウ ヘンドウ トクセイ ノ ハアク

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 Influence of hydraulic conditions on the bed-level fluctuation of mangrove forest during flood was clarified at the Okukubi River in Okinawa Island, Japan. Bed-level changes were monitored every one month from June 2012 to July 2015 at 18 stations. While non-dimensional shear stress during a flood was estimated by two-dimensional bed deformation analysis. Then relationship between observed bed-level change and non-dimensional shear stress was evaluated from correlation analysis. Bed-level change negatively correlates with non-dimensional shear stress during large flood. While during small flood, bed-level change doesn't correlates with non-dimensional shear stress. These results represent that bed-level fluctuation is occurred at sites where large non-dimensional shear stress is keeping during large floods. This condition can apply to selecting priority site in order to restoration of degraded mangrove forest.

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