LARGE SCALE SHORELINE ADVANCEMENT ON THE HASAKI COAST IN THE PAST 50 YEARS

  • BANNO Masayuki
    国立研究開発法人海上・港湾・航空技術研究所 港湾空港技術研究所 沿岸環境研究領域
  • KURIYAMA Yoshiaki
    国立研究開発法人海上・港湾・航空技術研究所 港湾空港技術研究所
  • TAKEWAKA Satoshi
    筑波大学 システム情報系

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Other Title
  • 波崎海岸において過去50年間に生じた二つの大規模汀線前進
  • ハサキ カイガン ニ オイテ カコ 50ネンカン ニ ショウジタ フタツ ノ ダイキボ テイセン ゼンシン

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Abstract

 We investigated shoreline evolution from 1961 to 2013 on the Hasaki coast and found twice significant large scale shoreline advancement. The mean shoreline advancement for the period exceeded 70 m. The first large scale shoreline advancement from 1969 to 1984 was considered to be caused by an increase in the total sediment budget on the coast due to a sediment dump of 50 million cubic meters. The second large scale shoreline advancement was caused by landward cross-shore sediment transport after 1993. Artificial headlands, which were constructed almost the same period of remarkable shoreline advance around the southern part of the coast from 2002, also possibly contributed to trapping of longshore sediment transport.

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