宮城県石巻市長面浦における東日本大震災後の水質特性

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  • Water quality characteristic after the Great East Japan Earthquake in Nagatsura-ura Lagoon, Miyagi
  • ミヤギケン イシノマキ シチョウメンウラ ニ オケル ヒガシニホン ダイシンサイ ゴ ノ スイシツ トクセイ

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To investigate the water quality in the Great East Japan Earthquake-stricken coastal area, Nagatsura-ura Lagoon, Miyagi, field observations and nutrient analyses were carried out between August 2012 and January 2013. The narrow inlet connecting the sea and the lagoon disappeared by tsunami and subsidence. Salinity distribution measured in August and October 2012 showed that the lagoon has changed from semi-enclosed sea area to open water area. Though the water exchange in the lagoon has changed after the earthquake, DO in the closed-off section of the lagoon was still under 4 mg l-1 in the bottom layer. TN and TP increased in the same area. The dysoxic and eutrophication in this area were also detected before the earthquake, we revealed the changed and unchanged points of water environment in the disaster bay.

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