Impact of Raft-culture on Hydrodynamic and Pollutant Transport in Qinhuangdao Coastal Water

Abstract:

With the increasing of the production and scale of raft-culture in Qinhuangdao coastal water, the characteristics of hydrodynamic and environment were changed by layout of a large number of breeding cage. A hydrodynamic and water quality model was calibrated and validated by the physical experiment of raft-culture and observation data. The validated model was used to simulate the hydrodynamic and pollutant transport process respectively with or without the raft-culture. The influence mechanism of the raft-culture on hydrodynamic and the pollutant transport was studied. It reveals that flow in the culture zone can be obstructed where the velocity decreases obviously; the velocity reduction in a higher density raft-culture zone is larger than that in a lower density zone; pollutant transport is obstructed by raft-culture, which leads the impact of obstruction concentrates inside raft-culture zone and the impact degree decreases progressively toward the sea from the raft-culture zone.