1. Department of Naval Architecture and Ocean Engineering, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
2. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, People's Republic of China
3. The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, People's Republic of China