Influence of tidal inlet depth on water level response and salinity intrusion in a Lagoon

Kazuya Watanabe, Hitoshi Tanaka

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The Nagatsura-ura Lagoon in Miyagi Prefecture, Japan is a semi-enclosed water area that has been used for aquaculture of oyster for these forty years. Recently, however, death of oysters has frequently occurred due to anoxic water near the bottom, and is a big concern among stakeholders. The Nagatsura-ura Lagoon and Oppa Bay are connected by shallow tidal inlet, and its water depth greatly affects hydrodynamics and water environment in the lagoon. In this study, time variation of water level in the lagoon in response to tidal variation is investigated through spectral analysis to quantify the role of water depth in the hydrodynamic process. Furthermore, the relationship between the inlet water depth and the salinity concentration intruding into the lagoon is examined through 3-D numerical simulation.

Original languageEnglish
JournalProceedings of the Coastal Engineering Conference
Publication statusPublished - 2010
Event32nd International Conference on Coastal Engineering, ICCE 2010 - Shanghai, China
Duration: 2010 Jun 302010 Jul 5


  • 3D numerical simulation
  • Nagatsura-ura Lagoon
  • Salinity intrusions
  • Spectral analysis
  • Water level variation


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