Abstract:

To obtain the key evaluation factors in the special evaluation and improve the regional applicability of evaluation standards for each single factor, a screening and optimizing method was proposed based on Nemerow index method. Based on the evaluation result tables established by the single factor index method and Nemerow index method, the ranking of evaluation factors was obtained by determining the quality category and calculating the nonzero results. Then, according to the ranking of factors, the consistency of the evaluation results of two methods could be improved by optimizing the single factor evaluation criteria. Taking the seawater intrusion assessment in Guangrao as an example, the application results showed that sodium adsorption ratio (SAR) was the key evaluation factor for seawater intrusion assessment in Guangrao. After the evaluation criteria of single factors were optimized, the consistency ratio of the evaluation results by single factor index method and Nemerow index method was improved to different extent. Among them, the optimization effect of chloride was the most significant, and its ratio of consistency was increased by 21.7% compared with the previous one. This method could provide more targeted technical supports for the repair and improvement of specific targets as well as some tracking or periodic evaluations.

Key words: Nemerow index method, single factor index method, applicability, screening and optimizing of evaluation factors