Bali Sea East China Sea Hainan Island History of engineering & technology Japan Sea KRI nanggala-402 submarine wreck Lombok Strait Luzon Strait MITgcm Okubo-Weiss parameter South China Sea Technology: general issues baroclinic tides extreme current velocity flow noise hybrid coordinate ocean model reanalysis results internal solitary wave internal solitary waves internal waves mesoscale flow field moored observation near-inertial internal waves near-inertial waves nonlinear internal wave nonseasonal variability propagating direction propagating speed relative vorticity remote sensing images shipboard observation