海底谷への土砂落ち込みの定量予測モデル-国府津海岸への適用

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タイトル別名
  • Quantitative Prediction of Sand Discharge into Submarine Canyons - Application to Kozu Coast
  • 霞ヶ浦大山地区における湖浜砂位の周期的変動の原因
  • カイテイコク エ ノ ドシャ オチコミ ノ テイリョウ ヨソク モデル コウズ カイガン エ ノ テキヨウ
  • Cause of Periodic Variation in Lakeshore Elevation at Ohyama Region in Lake Kasumigaura

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On the Seisho coast, submarine canyons have developed very close to the coastline and the discharge of fluvial sand of the Sakawa River into the submarine canyons has been reported, resulting in the net loss of sand into the offshore zone. The beach topography under the dynamically equilibrium conditions owing to the sediment supply from the river and the sand loss into the submarine canyons during several thousand years was reproduced using the contourline-change model considering the grain size composition. Long-term beach changes around the submarine canyons were accurately predicted and the effect of beach nourishment using a mixture of fine and coarse materials was investigated.

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