Comparison of HF radar observed and computed tidal currents around the mouth of Funka Bay [Japan]
2004
Isoda, Y. (Hokkaido Univ., Sapporo (Japan)) | Sakata, Y. | Isono, T. | Shimizu, M. | Kasuga, K. | Nadai, A. | Fujii, S. | Saitoh, S.
The model result of 2-demensional tidal model around Funka Bay (Sakata and Isoda, 1998) was used to compare with the surface tidal currents measured by HF radar around the bay mouth. Observed M2 (semi-diurnal tidal) currents measured by HF radar are in well agreement with those derived from the model. On the other hand, lin the specific period of about two weeks, observed K1 (diurnal tidal) currents show remarkable increasing of amplitude and changing to circular tidal ellipses in comparison with the computed tidal currents. Such change may appear to be associated with variations in southward flow of Coastal Oyashio. The horizontal shear flow, i.e., the relative vorticity of flow, in this specific period was larger than that in other period because of offshore movement of the flow axis. It is possible that large negative vorticity of flow shifts the apparent inertial period to the diurnal period, and hence horizontal current oscillation can be amplified.
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