FIELD INVESTIGATION OF SEACLIFF EROSION AT POINT HIGASHIHENNA-ZAKI EXTENDING AT SOUTHEAST END OF MIYAKO ISLAND

• UDA Takaaki

  （一財）土木研究センターなぎさ総合研究所兼日本大学理工学部海洋建築工学科

• ANDO Shohei

  前 内閣府沖縄総合事務局開発建設部河川課

• MORITA Akihiro

  前 内閣府沖縄総合事務局開発建設部河川課

• GUSHIKEN Yoshio

  前 内閣府沖縄総合事務局開発建設部河川課

• IGARASHI Tatsuyuki

  （一財）土木研究センター河川･海岸研究部

• OOKI Yasuhiro

  （一財）土木研究センター河川･海岸研究部

• SUGAHARA Kentaro

  コスモ海洋（株）関東支店技術部

• GOMI Hisaaki

  三洋テクノマリン（株）技術本部

Bibliographic Information

Other Title

• 宮古島南東端に伸びる東平安名崎の岩盤崩落に関する調査

Abstract

 Point Higashihenna-zaki extends at the southeast end of Miyako Island. At the south end of this point, rocky cliffs have collapsed by wave action. To investigate the mechanism, oblique aerial aphotographs of the rocky cliffs were taken using a drone on October 2017 as well as the investigation of the crack formed on the surface of the headland. Regarding the main external force to force the collapse of the rocky cliff, wave gages were installed at three points near the reef edge offshore of the headland between October 18 and November 19, 2017. On the basis of these field data, the cause of the collapse of the rocky cliffs was investigated. The main causes were considered to be due to wave abrasion and weathering of raised coral reef composed of limestone.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75 (2), I_611-I_616, 2019

  Japan Society of Civil Engineers

Keywords

• Miyako Island
• Point Higashihenna-zaki
• sea cliff
• wave notch
• collapsing

Details

• CRID: 1390001277366419200
• NII Article ID: 130007725015
• DOI: 10.2208/jscejoe.75.i_611
• ISSN: 21854688
• Web Site: https://www.jstage.jst.go.jp/article/jscejoe/75/2/75_I_611/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed