The technology of generating an artificial upwelling by constructing a seabed mound to increase the primary production is being examined off Ikitsuki Island, Nagasaki, Japan. A numerical simulation model is being developed in order to evaluate the effects and environmental influence of the artificial seabed mound. At the first stage of the modeling, tidal current is calculated for the coastal region including the artificial upwelling area. Since most of the boundaries of the computational domain are open to the ocean, it is necessary to give incoming tidal wave all over them, which is not easy because of complicate topography. A newly developed inverse method using the observation data at tidal stations along the coastline was applied to determine the boundary conditions of tide. The calculated tide by the method agreed fairly well with the observation data. Currents near the seabed mound was also investigated, whose result is indicated that internal wave induced by the mound makes the mixing larger.

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