Research On Ecological Security Evaluation Method Of Mountain Expressway Area Based On 3S Technology

The road may be a a part of transportation,that has the characteristics of wide radiation vary and long distance,and as a synthetic landscape encompasses a nice impact on the ecological setting on the route,and there’s no specific study on whether or not the degree of its impact threatens the ecological safety on each side of the road.Most of this studies specialize in the observation of ecological factors on highways and also the analysis of ecological and environmental quality once construction and operation.Therefore,the study of road ecological safety analysis throughout road operation is administrated to supply some reference for the immature road ecological safety analysis in China.The paper constructs AN index system for evaluating the ecological safety of mountain route road areas supported the content of the impact of highways on the ecological setting on the routes and with relation to the ecological support analysis framework.Using 3S technology as a method to method road knowledge,remote sensing knowledge and meteoric knowledge,and exploitation RS and GIS technology to extract data of analysis indexes,distribution values to index weights in keeping with the graded analysis technique,and exploitation the great index technique to get the ecological safety results of route road areas.The results of ecological security are explored in terms of spatial and temporal characteristics and spatial nonuniformity.The main research contents and conclusions of the paper are as follows:(1)From the ecological point of view,the content and characteristics of the impact of the highway on the ecological environment along the route are explained,and the study area of the mountainous highway road area is determined to be 1km on both sides of the road.(2)Per the content of route impact on ecological setting on the route,with relevance the ecological support analysis framework,the analysis of route ecological safety is rotten into 3 aspects of natural driving factors,ecological structure perform and ecological service capability,and ten representative indicators like slope,multi-year average precipitation,landscape fragmentation and normalized vegetation index area unit elite,the particular calculation methodology of every analysis indicator is given,and therefore the analysis indicator weights area unit determined by class-conscious analysis,and at last a route road ecological safety analysis index system is made.(3)Taking Qiwan throughway as associate degree example,the knowledge of every analysis index within the example space was extracted supported 3S technology,and also the analysis indexes were assigned weights exploitation stratified analysis methodology,so the ecological safety results of the road space of Qiwan throughway in 2005,2010,2015 and 2020 were obtained consistent with the great index methodology,and also the analysis of the empirical results showed that.(1)Spatial and temporal characteristics.In the past fifteen years,the common values of every ecological safety index were zero.46,0.60,0.56 and 0.68,and therefore the regional ecological safety scenario modified most drastically from 2005 to 2010,however the ecological safety scenario of Qiwan motorway showed a gradual trend of improving.The regional ecological safety level is split into 5 levels,of that the world of ecological safety level I accounts for the tiniest,and also the add of the world of ecological safety level IV and V accounts for over five hundredth.The regional ecological safety state of affairs from 2010 to 2015 showed a deterioration trend,and therefore the remainder of the amount was a gradual improvement trend,whose ecological safety improvement was chiefly manifested because the transformation between ecological safety level III and IV to level V,whereas the deterioration was manifested because the transformation of level IV and V to different lower levels.(2)Aspects of spatial differentiation.There square measure obvious variations within the distribution of land use varieties on every ecological safety level,with ecological insecurity(Level I)and fewer secure(Level II)distributed in areas dominated by construction land,essential safety(Level III)distributed in cultivable land and construction land,and ecological safer(Level IV)and ecological safety(Level V)distributed in forest land and piece of ground.The ecological safety level is vertically differentiated from the elevation,and also the higher the elevation,the additional wooded the land is,and also the higher the ecological safety standing.The ecological security level varies considerably with completely different distance areas,among that 500m-1000 m on each side of the road,the surround quality is poor and therefore the ecological security is unstable.The distinction between ecological safety level and road section is that the ecological atmosphere is seriously broken at the start of the road section,and therefore the ecological safety step by step becomes higher within the middle.