Application of DELFT 3D model for plan design of an artificial island——A case study for the artificial island construction in the Riyue Bay,Wanning City,Hainan Island

The construction of offshore artificial island has become one of the dominant ways for land reclamation.It will definitely alter the hydrodynamics,sediment transport and coastal morphology in the surrounding area.A critical issue for the success of the project is to choose an optimal layout and minimize its negative impact on the regional environment.This case study focuses on the application of DELFT 3D model to the plan design of an artificial island in Riyue Bay,Wanning City,Hainan Island.Through simulation of the changes in wave propagation,wave induced circulation,sediment transport and morphological evolution under different layout schemes,the possibility of formation of tombolo or salient is discussed,and the potential accumulated sand volume is calculated.Consequently,the advantages and disadvantages of each layout scheme are compared,and finally,an optimal scheme is recommended.The study results show that the possibility of the formation of the tombolo is reduced as the artificial island becomes far away from the coastline,the location is deeper,and the projected length on the wave crest is shorter.