アレー配置ブイによるGPS波浪観測システムの提案と波の到来方位推定精度

抄録

The long-period gravity waves of which the period is from some tens seconds to some tens minutes do not induce only the big sway of a ship moored and berthed in the harbor but also strong exfoliated flow and vortices near the harbor entrance. They cause serious problems on the safety of vessels berthing in, entering into and leaving a harbor. However, these waves have not been researched sufficiently yet.
In this paper, the long-period gravity waves measurement system of arrayed buoys equipped with the kinematic GPS is proposed. Three forms of arrayed buoys were examined for the wave propagational direction analysis by the method of the Multiple Signal Classification (MUSIC). Based on the simulation, the double triangular form could analyze most precisely among the forms, and the half power directional width was less than 1.6 degrees for non-coherent waves. And if span distances between the buoys were selected longer than 0.1 wavelengths, the half power directional width was less than 7 degrees.