Renjie Zhu¹, Wei Zhang¹, Xiaoyan Wei² and Henk M Schuttelaars³, (1)Hohai University, College of Harbour, Coastal and Offshore Engineering, Nanjing, China, (2)National Oceanography Centre, Marine Physics and Ocean Climate, Liverpool, United Kingdom, (3)Delft University of Technology, Delft Institute of Applied Mathematics, Delft, Netherlands