Research On The Coupling And Coordination Mechanism Of Highway Traffic And Road Ecological Environment Based On Multi-source Data

With the continuous expansion of the highway network in recent years,the contradiction between the development of highway traffic and environmental protection in the ecological function area has gradually emerged.The damage to the ecological landscape along the highway construction and the threat to the surrounding ecological environment from the pollution emissions of motor vehicles during operation have caused inevitable impacts on the biological populations and forest vegetation in the ecological function area,so it is important to study the Therefore,it is important to study the coupling and coordination relationship between highway development and ecological environment in the key ecological function areas.In this thesis,we analyze the current traffic situation and ecological environment in the G30 section of the Qilian Mountains Glacier and Water Containment Key Ecological Function Area,analyze and predict the pollutant emission characteristics of the highway road area and the results of the coupled and coordinated development of the highway traffic system and the road ecological environment system,and calculate the important correlation factors affecting the coupled and coordinated development.The main contents of the study are:firstly,we define the road area of the expressway,and analyze the trends of particulate matter(PM_2.5,PM₁₀)and gaseous pollutants（CO,SO₂,NO₂and O₃）in the vicinity of G30 Yongsan section of the expressway in the key ecological function area from different time scales,such as hour by hour,day by day,month by month and year by year,and analyze the correlation between traffic volume and PM_2.5,PM₁₀,CO,SO₂,O₃and NO₂through Pearson correlation.In addition,the relationship between meteorological conditions（temperature,wind speed,humidity,ground pressure）and the concentration of each pollutant was also analyzed;secondly,the SARIMA model was used to predict the concentration of the six gaseous pollutants in the next six months based on the monthly historical data from January 2013 to June 2022;then,according to the theory of road ecology,Then,based on the theoretical basis of highway road ecology theory,sustainable development theory and coupling theory,and following the principle of index selection,the index system of highway traffic system and road ecological environment system was constructed respectively,and the remote sensing data in multi-source data were pre-processed,and the weights of each system index were determined by using the subjective and objective combination weighting method（entropy value method and hierarchical analysis method）,and finally,the coupling coordination degree model was established to evaluate the relationship between highway traffic system and road ecological environment system in 2019-2022.Finally,the coupling coordination degree of highway traffic system and road ecological environment system in 2019-2022 was evaluated by establishing a coupling coordination degree model,and the factors affecting the coupling coordination degree were studied by gray correlation analysis.The following conclusions are drawn from the study:（1）with the expansion of the highway road area,the pollutant concentration(PM_2.5,PM₁₀,SO₂)gradually decreases in the form of power function and finally tends to a stable state,200 meters is the location of the inflection point of pollutant reduction,so this thesis defines the influence range of pollutants in the highway road area as 200 meters;（2）except for the change trend of monthly average concentration of O₃（2）Except for the monthly average concentration of O3,which is"low in winter and high in summer",showing an"inverted U-shape",all other pollutant concentrations show the changing characteristics of"high in winter and low in summer".（3）The models were evaluated by the index of model fit goodness R2,and the results showed that the models fit well and provided some reference values for the concentration changes of pollutants in the second half of 2022 in the road area of G30 Yongsan section.（4）The pyramid information model with 2 systems,5 primary indicators and 19 secondary indicators generally describes the overall situation of the road domain of G30 Yongsan section of expressway;（5）The analysis of the coupling and coordination results shows that the coupling and coordination degree of the traffic system and the road domain ecological environment system of G30 Yongsan section of expressway shows an up and down trend,with the lowest being 0.315 and the highest being 0.669,and its coupling and coordination degree can be divided into two stages:（i）early 2020:mildly dysfunctional stage,（ii）other periods:fluctuating barely coordinated stage;（6）According to the calculation results of gray correlation degree,it is found that all factors in the system index have a more significant influence on the coupling coordination degree,among which the top ranking is the highway traffic system in the passenger vehicle type three share index,passenger vehicle type four share index,cross-sectional traffic flow index and road area The leaf area index and vegetation index in the ecological environment system.Finally,countermeasures are proposed from the perspectives of rational adjustment of planned traffic flow and strengthening of environmental protection efforts,and future perspectives are made in further related studies of the highway traffic system and the roadway ecological environment system.