Expressway Ecological Environment Evaluation Theory And Method

With the rapid development of highways,highway ecological environment has become more serious,the ecological environment research questions freeway,expressway ecological environment evaluation and analysis,providing decision support for the management of highway Mo environment has important theoretical value and practical significance.In recent years,the rapid development of information technology,space and information mapping technology,the basic theories and methods of ecological assessment,provides a theoretical basis and technical support.For this reason,research paper carried out the following four areas:(1)focuses on the construction and highway index factor quantitative model index system of ecological environment.Mainly from the degradation of ecological environment and ecological environment,sensitivity to two aspects of highway ecological environment evaluation analysis and quantitative model of each index factor will be explained.(2)for the ecological environment index system,method of extraction technology index factors were studied.The main use of remote sensing information extraction technology,through a combination of computer and automatic interpretation of visual interpretation,accurate extraction of ground cover type Freeway,elevation,slope,aspect information.(3)focuses on the roadside ecological degradation-environmental sensitivity evaluation model analysis model and ecological environment.Biological abundance index,vegetation cover index,water network density index,land degradation index for the index to build the road to assess the degradation of ecological environment domain analysis model.In elevation,slope,aspect,river waters,land cover types of indicators,the establishment of ecological environmental sensitivity analysis model evaluation.Calculation and evaluation model by analytic hierarchy process synthesis weights and build the ecological environment comprehensive evaluation model.(4)In Qi-Wan Expressway for the study,evaluation of technical solutions to the ecological environment of the highway before and after the test from road construction and road construction.This paper chooses Qi-Wan Expressway as a typical mountain highway study area,through the establishment of ecological sensitivity evaluation model environment,ecological sensitivity road construction carried out before grading,the study area can be divided into development and construction,ecological environment protected areas,prohibit the development of the ecological environment construction area three functional areas,and the effect of the behavior of road construction on the ecological environment.Then analyzed through the establishment of ecological degradation environmental evaluation model,respectively,before the road construction and road-building after a comprehensive evaluation of the ecological environment,analyze the impact of highway construction on the ecological environment.