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Abstract In order to predict the threat level of sudden pollution on water source for obtaining the optimum emergency disposal technology scheme, the threat-evaluation index system with 10evaluation indexes is established in this study. The weights of the evaluation indicators are determined in accordance to corresponding threat levels. Besides, Group-G1index weighting method based on circling correction is put forward for reflecting the influence of differences among experts on index weights in group decision making. With Spearman rank correlation coefficient as the test criterion, the consensus ranking of evaluation index and experts’ weights are finally obtained through an iterative correction of onefold expert evaluation results with the combined evaluation methods integrating mean value method, Board method and Copeland method, so that the indexes are more accurate. In addition, the feasibility of this synthetic evaluation model has been verified through a sudden cadmium pollution incident that occurred in the Long River in 2012.
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Received: 16 March 2015
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