各種海底設置式波浪計による方向スペクトルの比較実証観測

抄録

Three different bottom mounted systems, DWDM, AWAC and DL2, were installed in the same offshore area within 20m horizontal distance where the wave conditions are expected to be the same. Acoustic techniques in combination with pressure are used in all systems, although the detail implementation is different in each system. The differences of the characteristics of the observed wave spectra are discussed through the observation.
Significant wave heights and periods obtained by each type of wave gauge showed good agreement during the test term, in both high wave conditions with significant wave heights bigger than 6m and low wave conditions with wave heights lower than 0.5m. However, in the high frequency component, AWAC results slightly differ to the DWDM and DL2 results. Because AWAC wave data analysis is based on the seabed pressure fluctuation, while DWDM and DL2 wave data analysis is based on direct acoustic water surface movement.