We developed a prediction method for providing detailed tide level and tidal current information covering the whole Seto Inland Sea. Simulations for 33 days on tide level and the tidal current were carried out after dividing the Seto Inland Sea into the 11 domains. Vertically integrated two-dimensional model was used for the simulation and tide level changes during the target period in the Kii Channel, Bungo Channel, and Kanmon Strait were used as boundary conditions. On the bases of the simulation result, we calculated 29 harmonic constants and constructed the harmonic constant database. The M2 tide and tidal current which are predominant of the Seto Inland Sea were compared with the observation data (48 tide and 51 tidal current stations). As a result, the overall distribution tendency of the M2 tide and tidal current indicated a good reproducibility. Moreover, it was shown that the estimated tidal current of 29 constituents that were acquired from harmonic analysis also reproduced local flows, such as eddies of the downward flow side of the islands, in the Kurushima Strait. Furthermore, good agreements were obtained when compared the tide data of 11 tidal stations in the Seto Inland Sea and the current chart mesh data. This method based on the harmonic analysis of the simulation result can predict the detailed flow of the whole Seto Inland Sea at any time, and the harmonic constant database has high practicality, resulting in a method of wide application.
We developed a water quality model coupled with a sub-model for each phytoplankton production. The sub-model can deal with three phytoplankton species and consider the response to cell quota. As the result of simulation using this model applying to the Tokyo bay, chlorophyll a of three phytoplankton species calculation results showed a seasonal variation tendency which was almost similar to the measurement value. In addition, the effect of the nutrients loading reduction on phytoplankton species biomasses, cell quota and water qualities were analyzed. As the result, only nitrogen in cell quota decreased when nitrogen loading was reduced, and when phosphorus loading was reduced, it became a tendency that decreasing of phytoplankton biomass, nitrogen and phosphorus in the cell quota.
This article introduces a conversion method from paper-based seismic profiles to SEG-Y formatted degital data. This method employs two free software, NetPBM and Seismic Unix which work on Unix-like OS. The principle is 1) scanning paper-based profiles to obtain pixel images conposed of 8 bit charactor, 2) conversion of trace data format from character to floating and 3) paste of SEG-Y header to floating trace data. Paper-based profiles drown by line scan recorder were successfully converted to trace-by-pixel SEG-Y data. Paper based wiggle profiles were converted firstly to trace-by-pixel SEG-Y data, and then to trace-by-trace SEG-Y data, by using horizontal trace sum of trace-by-pixel data. Quality of these data was examined and proofed that they are tolerable to be used, though they have restriction of paper. SEG-Y convertied data would provide additional analyses; deconvolution, migration, seismic attribute analyses, and would be ready for interpretation softwares.