科研之友
微信
新浪微博
Facebook
分享链接
摘要
A three-dimensional physical-biological coupled aquaculture model is developed to study the aquaculture carrying capacity of kelp in Sungo Bay, a typical aquaculture site in China with intensive suspended raft aquaculture. In the aquaculture model, the hydrodynamic module builds on the Princeton Ocean Model by adding two types of drags due to the aquaculture facilities at surface and kelp in water column. The biological module simulates the renewal of dissolved inorganic nitrogen (DIN), the cycle of phytoplankton biomass, and the growth of kelp, while the contribution of bivalves' excretion to DIN is set to a constant derived from observations. Thus, the coupling between the growth of kelp and the current variation can be studied by adding drags in the layers reached by kelp. The simulated magnitude and vertical profile of currents agree well with observations. The suspended aquaculture causes a reduction in the average speed of surface current by 40%, decreasing the water exchange with the open sea. The simulation results also show that the seasonal and spatial variations of the DIN concentration and phytoplankton biomass are clearly controlled by the distributions of different species. The estimation of DIN budgets of different periods shows competition between kelp and phytoplankton. The primary source of nutrients for the growth of kelp in Sungo Bay is the DIN from the open sea, and the aquaculture obstruction is the main reason for the deficient DIN in the kelp culture area. The final kelp production decreases from the mouth to the end of the bay, consistent with the spatial variation of water exchange rate. Numerical experiments have been carried out by increasing the aquaculture density of kelp from 0.8 to 1.5 times of the current value. Obtained results indicate that the optimal average density is 0.9 times of the current value.
- 出版日期2011-8-8
- 单位中国水产科学研究院; 天津科技大学; 国家海洋环境预报中心; 中国海洋大学
