Evaluation of Seawater Quality in Tianjin Offshore Based on Grey Clustering Method

摘要

The seawater quality in Tianjin offshore area from 2006a to 2007a was evaluated based on the Grey Clustering Method (GCM). The results showed that pollution was serious in the northern coast of the study area, but other areas had good water quality. After analyzing, we found that both the selected environmental factors and the factor numbers for evaluation affected result of grey clustering, especially when the environmental factors were of great difference in the pollution level. Further study is recommended to improve and perfect the grey clustering method in order to get more unified application, and it is also beneficial for the comparison of different results.