諫早湾の潮受け堤防排水門の開放に伴う流動について

概要

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The embankment of Isahaya Bay has been a big social problem since it is suspected as the main reason of the seaweed crop failure in Ariake Bay in winter from 2000 to 2001. Laver farmers insist to open the floodgates of the embankment. The investigation and the countermeasure have been discussed by the so-called third party committee. Marine environment is not simple because it consists of various factors by physical, chemical and biological effects. The flow in the bay, however, is primary important as the diffusion of materials is governed by the flow as the background. We tried to simulate the flow and the diffusions inside and outside of the embankment associated with the opening the floodgates. The numerical results on the velocity distribution around the gates, water flux through the gates during a tide, tidal exchange rate of the reservoir through the gates, diffusion pattern of water from the reservoir at Isahaya Bay and the residual flow changes with/without the embankment are presented by graphics.
2001-09-30