Abstract
Aimed at the fragile ecological environment in desert, once the resources along routes are destroyed, it will be difficult to restore the original ecological equilibrium in a short time. This paper studies the ecological-equilibrium-oriented risk evaluation of desert motorway schemes in order to choose route schemes reasonably and prevent the sandstorm aggravation caused by ecological damage. Having insight into the special geographical environment and road construction characteristics of Tengger Desert, the research establishes an index system for the ecological risk evaluation in desert areas from five aspects: the interference of living environment of animals and plants, the destruction of natural ecological landscapes, the pollution of water and soil resources, the development and utilization of natural resources, and the sand fixation of plants and the subsequent maintenance; then it confirms each evaluation index’s weight by using the set-valued statistics method to transform the description of the evaluation indexes to an interval value and furthermore determines the comprehensive ecological risk evaluation level of the route scheme in virtue of the two-dimensional cloud image MATLAB outputs which takes the ecological damage and remediation cost as the basic variables. By constructing the model under the method above, the ecological risk evaluations of two route schemes in Zhongwei sand crossing section of Wuhai-Maqin Expressway have been made. The result shows that the western route scheme’s evaluation grade is “good,” is better than the southern route scheme, is within the scope of acceptable risk, agrees with the practical project condition, and verifies the applicability and effectiveness of the model for ecological risk evaluation in desert areas.
Highlights
Ecological risk evaluation is an important issue considered in the comparison and selection of route schemes, especially in the areas where the ecological environment is fragile
With the help of MATLAB positive cloud generator to output two-dimensional cloud images, the ecological risk evaluation of different desert expressway schemes can be reflected intuitively. rough the application of the research methods above, this paper provides a theoretical basis for the ecological risk evaluation of desert expressway construction and provides a reference for similar projects
Based on the one-dimensional cloud model, the concept of multidimensional cloud model is introduced to describe the complex concepts under the synergistic action of multidimensional factors. e ecological security in the desert area is reflected by both the degree of natural damage during the sand-crossing expressway construction and the later remediation cost, so that the evaluation indexes are used as the measurement, and the ecological damage and remediation cost are selected as the two-dimensional basic variables of ecological risk evaluation
Summary
Ecological risk evaluation is an important issue considered in the comparison and selection of route schemes, especially in the areas where the ecological environment is fragile. Mathematical Problems in Engineering environment of expressways, which has further improved the scientific and standardized level of environmental protection work [12, 13] These existing researches only take one fact, the degree of environmental damage, into consideration when evaluating the expressway scheme and lacks the multidimensional consideration of ecological risk. Based on the research status, this paper takes the Zhongwei sand-crossing section of the Wu-Ma Expressway as the research object and the Tengger Desert as the research background and makes an evaluation of the ecological environment along different road schemes from the damage degree and the remediation costs. E set-valued statistics method is used to consider the relative contribution of different factors to the desert ecological environment and the comprehensive evaluation is made combined with two-dimensional cloud theory from the ecological damage situation and remediation cost. With the help of MATLAB positive cloud generator to output two-dimensional cloud images, the ecological risk evaluation of different desert expressway schemes can be reflected intuitively. rough the application of the research methods above, this paper provides a theoretical basis for the ecological risk evaluation of desert expressway construction and provides a reference for similar projects
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