Effect of reclamation engineering in Qinzhou Bond Harbor on marine environment of Qinzhou Bay

In this paper,the effects of reclamation engineering in Qinzhou Bond Harbor’s on flow field,erosion and silt environment and storage capacity of tidal water were analyzed with methods of current numerical simulation,sea chart comparison and sediment discharge calculation.The results show that after reclamation engineering,the current velocity at west and east of project area increases at the rate of 0~0.2 m/s and the rate decrease gradually from the border to outboard.Current velocity at South decreases at the rate of 0~0.25 m/s.Current direction at West of project area changes slightly because it is dominated by deep canal.But direction at East and West of project area changes obviously because the new coastline alternates original current direction.Reclamation engineering does not shift the principal direction in east canal and sediment discharge path to external bay.The project makes current velocity in east canal increase,which is beneficial to sediment launching and moving.Bed load sediment in east canal changes from silting to slight erosion which is good for keeping channel stable.After the reclamation engineering,the water storage capacity of Qinzhou Bay decreases 3934.38 104m3,which is 2% of total water storage capacity of Qinzhou Bay.