Research On Ecological Risk Assessment Of High-Speed Railway

In recent years, with the rapid development of high-speed railway construction in China, the regional economy has been significantly promoted with the unique advantages of high-speed railway, while also coming along with a certain amount of ecological risk for the surrounding ecosystem. At present, there is little ecological risk assessment for railway especially high-speed railway construction in China. Therefore, it has a great significance to conduct more in-depth studies in ecological risk assessment of high-speed railway construction for security and stability of the construction, as well as protecting the ecological environment.In this thesis, a number of impacts of the surrounding ecosystem from high-speed railway construction have been analyzed with the perspective of risk by studying the theory of regional ecological risk assessment. First of all, applying "pressure-state-response" model to select indicators from three aspects:risk sources danger (pressure), ecosystem vulnerability (state) and the effectiveness of risk management (response),and building an indicator system of high-speed rail ecological risk assessment. In this system, First level indicators include risk index, vulnerability index and risk management index; Secondary level indicators include level of landslide risk, erosion risk, soil environmental risk, water&environmental risk, atmosphere risk, sound risks, population vulnerability index, flora and fauna fragility index, landscape vulnerability index, ecological restoration index and ecological prevention index. Then, a high-speed railway quantitative model of ecological risk assessment established by the multi-level gray method, combining with high-speed rail ecological risk assessment index system. Finally, according to the high-speed rail ecological risk assessment index system and the quantitative model, the example of high-speed rail "Cheng-Guan" line has been evaluated with the comprehensive ecological risk evaluation value4.9087, indicating that the ecological risk of the "Cheng-Guan" line is between low-risk and early warning and more interested in warning level.The results show that the ecological risk index system and quantitative model of high-speed railway established in this thesis have a certain practicability. This research has certain theoretical and practical value which can be reference for ecological risk assessment of high-speed railway construction.