VF型位相平均Primitive方程式を用いた沿岸海洋流動に及ぼす波浪の影響に関する研究

抄録

Influences of surface gravity waves on an inner-shelf circulation, such as an interaction between waves' Stokes-drift and Coriolis force and a correlation between Stokes drift and background relative vorticity, are investigated with a quadruple-nested high-resolution modeling framework based on ROMS-WEC (Uchiyama et al., 2010). While the primary momentum balance occurs between the pressure gradient and Coriolis forces, consistent with the geostrophic balance at R_o < 1, the Stokes-Coriolis effect comes in at the same order of magnitude to modify the dynamic balance substantially. Eddy kinetic energy associated with mesoscale and submesoscale momentum fluctuations is also strongly affected by waves. The latter is energized in the nearshore, leading to the dominant submesoscale contribution through vortex force.