小樽湾におけるドップラーレーダーによる海面状況の観測

抄録

The observation was made to examine the relationship between the sea state and radar sea echo signals and to obtain information and the characteristics of the sea state from the signals by the doppler radar in Otaru Bay, Hokkaido for 49 days in total from the 14th of December, 1991 to the 31st of January, 1992. Here, the doppler direction is defined as a direction in which the maximum doppler shift of radar sea echo signals occurs, and the doppler speed of the signals is also done as an average doppler speed on that doppler direction. It was found out that the doppler direction and speed were not related with the direction and speed of winds and currents, but related strongly and agreed so well with the propagating direction and phase speed of waves, respectively. The doppler speed is proportional to the phase speed of the significant waves estimated from the observed wave period with the 1/10 to 1/3 slope. It is concluded that the doppler shift of the radar sea echo signals is mainly caused by the wave propagation even though it might be slightly effected by winds and currents.