First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China;
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China;
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
Key Laboratory of Marine Science and Numerical Modelling, State Ocean Administration, Qingdao 266061, China;
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
Key Laboratory of Marine Science and Numerical Modelling, State Ocean Administration, Qingdao 266061, China;
vertically forced oscillation; nonlinear amplitude equation; phase-plane; surface wave modes;