天竜川河口テラスの高頻度なモニタリングに基づく地形変化の解析

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タイトル別名
  • Analysis of Topographic Changes in Terrace of the Tenryu River Mouth Using Fishing-derived Bathymetry
  • テンリュウガワ カコウ テラス ノ コウヒンド ナ モニタリング ニ モトズク チケイ ヘンカ ノ カイセキ

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This study presents bathymetric changes and its characteristics due to high waves and fluvial floods are examined for river mouth terrace in a wave-dominated estuary of the Tenryu river,a sediment-rich river on the Pacific coast (Enshu-nada) of central Japan. Frequent continuous nearshore bathymetric data of the river mouth terrace and vicinity are obtained from records of whitebait fishing activity by small vessels. Dominant feature of 5-year bathymetric trend are exhibited by concentrated erosion (approximately 3 m vertically) within the front of river mouth and the frontal lobe of terrace migration. Wave-induced retrogradation and flood-induced progradation of the terrace front during meteorological event are examined by transect analysis of the lobe.

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