STUDY ON LONG-TREM EROSION OF HAI HAU COAST, NORTHERN VIETNAM

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  • ベトナム北部ハイハウ海岸の発達と侵食過程に関する研究
  • ベトナム ホクブ ハイハウ カイガン ノ ハッタツ ト シンショク カテイ ニ カンスル ケンキュウ

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 Hai Hau Coast, Nam Dinh Province, northern Vietnam is an approximately 30 km long sandy beach, which is suffering long-term erosion in the last hundred years. The amount of erosion exceeds 1, 000 m, and several villages in the hinterland disappeared during this recession. On the other hand, at the river estuaries, north and south of the main part of Hai Hau Coast, satellite images capture formations of newly deposited areas, which are indicating that the rivers are still putting a huge amount of sand to the coast. This study tires to understand the formation process of Hai Hau Coast, and why it turned to erosive circumstance of nowadays, from literature survey, dating of sampled shells from the hinterland, and by a numerical computation of shoreline changes with one-line model. From literature survey, the area was so-called river dominated delta, and was continuously accumulating by the sediment input of old Red River. A large flood diverted the old Red River to the north and south, the present river estuaries, and the coast turned to so-called wave dominated delta, and the long-term erosion has started after this event. From the results of carbon dating of the shells, speed and amount of accumulation before the flood event were estimated. After the diversion, one-line model was applied to discuss the shoreline changes, which well reproduced the on-going erosion of Hai Hau Coast. The numerical result suggests that reclamation of the deposited sediments at the estuaries is one of the possible reasons of long-term erosion, which prevents feeding sand from the river to the coast.

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