This paper demonstrates that a coupled new coastal wave model <Lin and Huang, 1996a, 1996b; Lin and Perrie, 1997, 1999> combined with a coastal current circulation model <Haidvogel and Aike, 1999>, accurately predicts the surface features of seamount trapped waves. The environmental conditions, such as wind, buoyancy frequency, bottom topography, latitude, and tidal current are the model-input parameters. We have tested the applicability of the coupled model, using a set of trapped waves in the vicinity of two seamounts in the Northwest Pacific ocean. Our motivation for doing this is to see if it is possible to understand the origin of sea surface manifestations of these seamounts that appear to be present in images derived using a synthetic aperture radar (SAR), from the Russian Kosmos 1870 satellite. Each seamount is about 0.7 km in height and has a 20 km semidiameter width, and the ocean is about 5 km in depth. The model results suggest it is possible to detect these kinds of sea surface signatures from even such small seamounts in deep ocean by radar imagery, directly, at low wind speeds (<1 m/s), and indirectly, at higher wind speeds, from wave-breaking that occurs in the shorter wavelength portions of the spectrum. |