Prediction of the effect of reclamation near Liangtan Island in Zhoushan water area

A three-dimensional ocean model(ECOMSED) is used to simulate and predict the effect of reclamation activity on the local tidal current near Liangtan Island in Zhoushan.The computed results of tidal current basically agree with the obser-vations.It is shown that the local tidal current is affected by the reclamation mainly in a small area located at the southeast corner of the reclaimed area where a pronounced reduction appears in tidal current velocity and causes a slight sedimentation.The extent of the sedimentation is 13 cm and 0.8-1.2 m one year and five years after the reclamation,respectively.The recla-mation has a slight influence on the deeper current.The distribution of the suspended substance caused by the reclamation shows that the suspended substance coming from an unceasing discharging source has a main effect on the adjacent and up-stream areas during the flood tide period,and on the periphery and downstream areas during the ebb tide period.Furthermore,the affected area is larger during the ebb tide period than during the flood tide period.As a whole,the reclamation project has a slight effect on the local tidal current as well as erosion and siltation.