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2016 | OriginalPaper | Buchkapitel

13. Tsunami Impacts on Eelgrass Beds and Acute Deterioration of Coastal Water Quality Due to the Damage of Sewage Treatment Plant in Matsushima Bay, Japan

verfasst von : Takashi Sakamaki, Youhei Sakurai, Osamu Nishimura

Erschienen in: Tsunamis and Earthquakes in Coastal Environments

Verlag: Springer International Publishing

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Abstract

The 2011 tsunami in Japan severely disturbed the benthic biota in Matsushima Bay (Miyagi Prefecture) via sediment erosion. Eelgrass beds markedly decreased from their original coverage of 2.2 km2 in June 2007–0.02 km2 in May 2012. Although our monitoring indicates that the eelgrass beds are slowly recovering, an analysis based on a Habitat Suitability Index model suggests that their recovery is restricted by deteriorated light conditions due to land subsidence resulting from the prior earthquake. Additionally, the tsunami severely damaged a sewage treatment plant adjacent to the bay, and this led to acute increases in chemical oxygen demand and coliform bacteria in the seawater. However, the water quality improved when the damaged sewage treatment plant started temporary operations, such as sedimentation, aeration, and chlorination, and recovered to pre-tsunami conditions in approximately 1.5 years. These results demonstrate that temporary treatment methods are important to minimize acute impacts of treatment facility damage on water environments.

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Metadaten
Titel
Tsunami Impacts on Eelgrass Beds and Acute Deterioration of Coastal Water Quality Due to the Damage of Sewage Treatment Plant in Matsushima Bay, Japan
verfasst von
Takashi Sakamaki
Youhei Sakurai
Osamu Nishimura
Copyright-Jahr
2016
DOI
https://doi.org/10.1007/978-3-319-28528-3_13