| Aimless increment of aquaculture density and cultivating area is the chief causes of the frequently out-breaking of marine aquaculture disease and the deterioration of the marine environment. More and more people have realized that research on aquaculture environmental capacity is imperative under the situation.In this paper, the advanced three-dimensional Estuary, Coastal and Ocean Model (ECOM-Si) has been used to simulate the tidal current field of Xiangshan Harbor sea area. The simulation results match well with the actual ones. Based on the current field, the concentration distribution of nitrogen and phosphorus is simulated.The response relationship between the water quality and the net cage farming pollution has been built in this paper. The maximum permitted discharge amount of every aquaculture area has been arrived considering the seawater quality planning. Based on the loadings of nitrogen and phosphorus of every net cage and the permitted discharge amount, the aquaculture environmental capacity of every net cage can be achieved and the total of which will be the aquaculture environmental capacity of Xiangshan Harbor.The results show that the aquaculture environmental capacity in Xiangshan Harbor is about 14233 net cages if nitrogen is the pollution limitation factor. If it is phosphorus, the result will be about 10000 cages. The aquaculture status has exceeded the environmental capacity inXiangshan Harbor and must be reduced. The reduction is about 6000 net cages, among which Xihu Harbor and Qifeng cultivating areas have the relatively higher reduction number.In this paper the total net cage farming in Xiangshan Harbor is given. The achievement of this research can give a scientific evidence for water quality management. What's more, it has instructional significance for inhibiting water contamination avenue to Xiangshan Harbor. Besides, this study enriches the methods of research on marine aquaculture environmental capacity and provides a useful reference for others. |
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