Research On Highway Route Scheme Selection Of Gongbo Gorge Reservoir Area With Consideration Of Environmental Impact

The topographical conditions of the upper reaches of the Yellow River basin are complex,the surface undulation is large,the gully is the main valley,the highway construction must overcome the large height difference and surmounts the various obstacles,not only the project quantity is huge,but also the construction difficulty is great.In the process of traditional route selection of highway in canyon reservoir area,the control of construction investment is more based on the technical and economic aspects of highway construction,and less on environmental impact.In the upper reaches of the Yellow River,the natural environment conditions are complex and the ecology is fragile.The highway construction will have a great impact on the environment along the river.Many typical cases have been exposed one after another,resulting in serious adverse consequences.In the process of highway construction,how to take environmental impact as an important content of route scheme evaluation,and how to balance environmental protection with technology and economy,so as to achieve sustainable development of highway construction,is an engineering problem that needs to be solved properly.In view of the above problems,on the basis of summarizing the research results of highway route selection considering environmental impact at home and abroad,this paper takes the highway route selection of Gongbo Gorge reservoir area in the upper Yellow River as the research object.According to the regional environmental characteristics,the specific impacts of highway construction on natural environment,ecological resources and social environment are systematically analyzed.Through Multiple-index Comprehensive Evaluation,the environmental impact evaluation index system and evaluation model of highway route scheme in Gongbo Gorge reservoir area in the upper Yellow River are established,which provides theoretical support and decision-making reference for engineering problems.Firstly,this paper analyzes the factors that need to be considered in highway route selection in the upper Yellow River reservoir area,and proposes that except the natural environment,the social environment,economic environment,ecological resources and other influences should also be considered in highway route selection.Combined with the specific problems encountered in the construction process of the completed typical highways,the principles and requirements of highway route selection in the Gongbo Gorge reservoir area of the Yellow River are clarified,and the methods and steps for determining the highway route scheme in the Gongbo Gorge reservoir area are summarized.After analyzing the characteristics of various common schemes evaluation methods,the fuzzy comprehensive evaluation method is selected to evaluate the line scheme,and the analytic hierarchy process is used to determine the index weight and establish the evaluation model.Secondly,in accordance with the principles and ideas of constructing of indicator system,the target decomposition method is used to determine the hierarchical structure of the scheme evaluation index system,The indexes are mainly selected from the aspects of environmental impact and technical economy.A total of three first-level indexes,such as social environment,and 15 second-level indicators,such as the number of land occupation and the degree of public participation,are selected.The indexes are quantified by using the threshold method and expert grading method,and the evaluation index system of highway route scheme considering environmental impact is established.Finally,a typical engineering case is selected,and the route scheme evaluation model of Gongbo Gorge reservoir area of the Yellow River considering environmental impact established in this paper is used for analysis and verification.The results are consistent with the recommended scheme in the research report,indicating that the route scheme evaluation system can be used to select the route scheme with less environmental impact,which can provide reference for the decision-making of route scheme of similar projects in the future.