Application of the Cloud Model Synthesis Method in Ecological Evaluation of Waterways

Abstract

The cloud model synthesis method based on the membership cloud theory combines the fuzziness and randomness of uncertain problems in reality and is a model that can realize the transformation between qualitative concepts and quantitative data compared with the traditional fuzzy theory system. The theory and method are relatively lacking in the research work of waterway ecological evaluation. In view of the abovementioned characteristics and the advantages of wide applications of the membership cloud model, this paper takes the ecological evaluation of the Jingjiang River waterway as an example and applies the cloud model synthesis method to the comprehensive evaluation of waterway ecology. The cloud generator MATLAB code is used as a tool to combine the expert scoring data of the Jingjiang ecological waterway comprehensive evaluation system, and the clouding principle of human scoring variables is applied to conduct a comprehensive evaluation of the ecological nature of the Jingjiang waterway from 2011 to 2015. The results show that the cloud model synthesis method is applicable to the ecological evaluation of waterways and has the advantages of being applicable to subjective and objective data as well as retaining the uncertainty of each element in the evaluation system in the calculation process. This research can play a supplementary and perfect role for the method of waterway ecological evaluation.

Stability Evaluation of the Goaf Based on Combination Weighting and Cloud Model

“…According to references, the stability of goafs in metal underground mines is divided into four grades: I, II, III, and IV. Level II indicates poor stability of goafs; Level III indicates that goafs are more stable; and Level IV indicates 2 Advances in Civil Engineering greater goaf stability [19][20][21][22]. Tables 1 and 2 show the corresponding standards of indicators for the different goaf stability levels.…”