Marine environmental quality evaluation based on grey correlation analysis a case study on offshore marine areas of Xiamen

With the development of economy and society, marine environmental pollution is becoming serious. It is of great significance to evaluate conditions of marine environmental quality correctly. This paper selected inorganic nitrogen, activated phosphate, dissolved oxygen and chemical oxygen demand as evaluation indexes. Then it established an evaluation model of marine environmental quality based on grey correlation analysis. Finally it developed a case study on Maluan Bay, West Waters, West Hekou, Tong´an Bay, East Waters and Dacheng Waters in Xiamen. The sequence of the six waters in 2007 was: Dacheng Waters>East Waters>Tong´an Bay>West Hekou>West Waters>Maluan Bay. Marine environmental qualities of Dacheng Waters, East Waters and the other four waters belonged to II, III and IV grade respectively. The results showed that water body in offshore waters of Xiamen was polluted and marine environment deteriorated. Additionally, change trends of the four indexes from 2001 to 2007 were analyzed.