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Analysis of Influence Factors to the Water Environment of Ofunato Bay Based on the Observed Data

2014; Volume: 70; Issue: 2 Linguagem: Inglês

10.2208/kaigan.70.i_426

1883-8944

Ken Furudoi, Shigeki Sakai, Kazuo Murakami, Yoshiyuki NAKAMURA, Ikuo ABE, Tomonari Okada, Hidenori Shibaki, Toshiyuki Takao,

Earthquake and Tsunami Effects

Ofunato Bay was severely damaged by the 2011 Great East Japan Tsunami. In order to investigate shifts in flow and water quality field due to the change of geometry at the entrance of the bay, field observations of tidal current and temperature, salinity, dissolved oxygen of the bay were carried out in 2012 and 2013. The characteristics of flow and water quality in the Ofunato Bay were analyzed based on the observed data. The results of analysis clarified the several phenomena, the intermittent intrusions of seawater from outer bay, the generation of semidiurnal internal tidal current and vertical circulation due to density flow constructed by 3 layers structure. These flow phenomena influence and maintain for the well conditions of water quality in the bay.