Urban Three-Dimensional Geological Environment Evaluation Based on Variable Weight Theory

Geological environment quality refers to the degree of adaptation to which specific geological space is adapted to the development of human social and economic activities. In this study, a study area is selected in the Jinan spring area and a three-dimensional geological model is established. The geological environment evaluation system is constructed according to the geological environment characteristics of the study area. A constant-weight evaluation model and a penalty-incentive variable-weight model are used to evaluate the geological environment of the study area. The comparison of the evaluation results shows that the value domain of the variable-weight evaluation is obviously better discrete than that of the constant-weight evaluation results. The variable weighted evaluation is more punitive than rewarding. The area of the better zone decreased from 60.3% to 50.4% and the area of the worse zone increased from 26.0% to 39.4%. It is more in line with the actual geoenvironmental conditions of the study area, thus improving the credibility and reliability of the geoenvironmental evaluation grade.