The concept of the excavated channel at Shimokita arm is considered to increase the tidal exchange between the innerpart of the Mutsu Bay and the open sea.The change of flow velocity is calculated by FEM under two conditions with and without the excavated channel.In additions, the utilizing the excavated chamel as seaway gives the possibility of the reduction of carbon dioxide emission and energy consumption due to shortcut of seaway route.And, the possibility of reduction of goods movement cost is also investigated in the paper.
