Akira Koizumi*, Toyono Inakazu*, Tetsuya Fujita* and Tohru Furuichi**

* Chair of Sanitary Engineering, Department of Civil Engineering, Faculty of Engineering, Tokyo Metropolitan University
** Chair of Environmental Engineering, Department of Energy Systems Engineering, University of Osaka Prefecture

+ Correspondence should be addressed to Akira Koizumi:
Department of Civil Eng. Tokyo Metropolitan University
(1-1 Minamiosawa, Hachioji City, Tokyo, 192-03 Japan)

Abstract

This paper proposes an evaluation method that can consider the various elements of alternatives during selection of a final disposal site plan. In this evaluation, these elements of possible final disposal sites contain fuzziness within themselves and uncertainty regarding the future; we use the fuzzy theory on these points. In our proposed method, first we select factors of all different sorts that will be the cause of problems in the final disposal site, and make a hierarchical structure of them using ISM (Interpretive Structural Modeling) method. Next, applying fuzzy theory, a point system expressing the desirability of alternatives vis a vis the basic factors, in the hierarchical structure, is created using the membership function. Then, based on the weights which are given to each factor, we calculate the evaluation values for each final disposal site. With these results, we make the comprehensive evaluation, using fuzzy theory, for the final disposal site plan alternatives. Furthermore, we show the case studies using our proposed method for three actual sites, in order to shed light on the effectiveness of this method. The outcomes of this study were the same as the evaluation of things as they are, here; it has been proved that our evaluation method can be applied to the comparison of several alternatives in site planning.

Key words: final disposal site, comprehensive evaluation, uncertainty, fuzzy theory, membership function