Research on entrance training and reclamation project of Dongshuigang, Chengmai county, Hainan

摘要

According to the measured and statistical data, this paper outlined the natural conditions, the characteristics of hydrodynamic, sediment, geomorphic and geological conditions near the lagoon of Dongshuigang, Chengmai County, Hainan. It also analyzed the formation processes of sand barrier, sand spit, lagoon system and the seabed revolution. The analysis results show that the terrain erosion and disposition at the entrance and near theudsandbank on the east of Dongshuigang is of great changes and the erosion and siltation rate in the lagoon is small. The sand from the river basin and human activities are the main causes for deposition in the lagoon. The tidal current numerical model for partial Chengmai Bay is verified based on the measured data and the project scheme is researchedudwith this model. The research shows that the reclamation project inside the lagoon slightly reduces the tidal prism of lagoon; the flow velocity near the project decreases somewhat after reclamation outside the entrance, entrance expansion and excavation of the waterway. The influences of Scheme I, Scheme II and Scheme III on tidal prism of lagoon are equally small and the reclamation project serves as a sand dike, playing a role in maintaining the stability of the channel at the entrance of Dongshuigang.