Study On Load Estimation And Control Measures Of Eutrophication By Non-point Sources Pollution In Coastal Areas

The point source pollution in the cities along the coast has been controlled gradually, however, the quality of sea water has not been improved obviously yet. Eutrophication is developing and algae bloom happens frequently. It is important for sustainable developing of coastal economy to estimate the load of non-point source pollution in coastal waters and raise corresponding control measures in both theoretic value and realistic significances.The paper focused on discussing the scope of research, estimating the load of non-point source pollution in coastal waters by the method of GIS and fieldwork, putting forward a principle for determining the total pollutant loading control of non-point sources pollution in coastal areas, raising the management measures and technical measurements based on ecosystem management. Major results are following.Firstly, the load of annual total nitrogen and annual total phosphorus of non-point source pollution were estimated with the method of GIS and fieldwork, which mainly includes household wastewater, livestock cultivation, surface runoff and marine aquaculture. According to the ecological carrying capacity, the principle and technical method of total pollutant loading control of non-point source pollution were put forward, which provide a scientific basis for the plan of coastal areas total pollutant control. It will make an instructing role on establishing total pollution control plan and pollution control of coastal areas in methodology.Secondly, in view of the weakness of non-point sources pollution prevention and control in China, we illustrated that management measure is vital to control non-point sources pollution of coastal areas by analyzing human people motivations and responses in ecosystem management with game theory. Moreover, the control measures of non-point source pollution in coastal areas from regulations system, policy laws, and economical method are created. It is valuable for the management of non-point source pollution and construction of policy laws and regulations system.Finally, using Luoyuan Bay which partial sea areas happens eutrophication as case, the load of annual total-nitrogen and annual total-phosphorus of non-point source pollution were 4858.34 t and 201.03 t in Luoyuan coastal areas in 2004, respectively. The load of non-point sources pollutant occupied more than 90% above of the total...