Changes in the coastal environment in Kamaishi Bay after the Great East Japan Earthquake

• YAMAMOTO MITSUO

  Ocean Alliance, The University of Tokyo

• KATO TAKAYOSHI

  School of Engineering, The University of Tokyo

• TABETA SHIGERU

  Graduate School of Frontier Sciences, The University of Tokyo

• KITAZAWA DAISUKE

  Institute of Industrial Science, The University of Tokyo

• FUJINO MASATOSHI

  Institute of Industrial Science, The University of Tokyo

• SHOZUGAWA KATSUMI

  Graduate School of Arts and Sciences, The University of Tokyo

• MATSUO MOTOYUKI

  Graduate School of Arts and Sciences, The University of Tokyo

• TANAKA KIYOSHI

  Atmosphere and Ocean Research Institute, The University of Tokyo

• MICHIDA YUTAKA

  Atmosphere and Ocean Research Institute, The University of Tokyo

Bibliographic Information

Other Title

• 東日本大震災後の釜石湾における海域環境変化
• ヒガシニホン ダイシンサイ ゴ ノ カマイシワン ニ オケル カイイキ カンキョウ ヘンカ

Abstract

  We investigated the effects of the Great East Japan Earthquake on the coastal environment of Kamaishi Bay, Iwate Prefecture, Japan and its restoration process. We analyzed the concentrations of nutrients and heavy metals in seawater, and the concentrations of radioactive materials in sediments. Dissolved inorganic nitrogen, PO₄-P, and SiO₂-Si during March 2012 to November 2013 showed altered patterns of seasonal variation compared with before the disaster. This is attributed to the destruction of the breakwater in the mouth of the bay. Seawater concentrations of Cd, Pb, Cr, Zn, As and Se were below or equal to the accepted environmental standards in Japan. Although radioactive materials (¹³⁴Cs and ¹³⁷Cs) produced by the Fukushima nuclear accident were detected in sediments of Kamaishi Bay, they were only found in low concentrations. The concentrations increased gradually during the first half of the investigation, then decreased and remained constant during the latter half of the observation. Our results show that by November 2013, 2.5 years after the earthquake, the coastal environments in Kamaishi Bay had recovered from the effects of the disaster.<br>

Journal

• NIPPON SUISAN GAKKAISHI

  NIPPON SUISAN GAKKAISHI 81 (2), 243-255, 2015

  The Japanese Society of Fisheries Science

Keywords

• 栄養塩
• 海域環境変化
• 釜石湾
• 重金属
• 東日本大震災
• 放射性物質

Details

• CRID: 1390001206418008448
• NII Article ID: 130004780819
• NII Book ID: AN00193422
• DOI: 10.2331/suisan.81.243
• ISSN: 1349998X
• ISSN: 00215392
• NDL BIB ID: 026312362
• Web Site: https://agriknowledge.affrc.go.jp/RN/2030891465
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026312362
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed