Combined assessment model of harbour navigation environment safety assessment

In order to solve the assessment diversity on the same thing caused by different assessment methods, combined assessment model(CAM) was proposed. 10 seaports of China were used as a sample case of safety level ordering assessment of navigation environment. The methods of principal component analysis(PCA), factor analysis, TOPSIS, fuzzy aggregate assessment, gray aggregate assessment were employed to the case separately, and 5 different group results were obtained. The theory of serial number summation and mode theory were adopted to coordinate the results of the 5 methods, and come to an only ordering conclusion. The conclusion based on CAM is much close to the fact, excelled to any result of single method, and generally accepted by senior master mariners.