Spatial Identification And Evolution Analysis Of Urban Fringe Area In Jinan

The urban fringe area is an area between the city and the countryside,transitioning from the city to the countryside.It is one of the important places in the process of urban development.It is also the area with the greatest potential for urban development in the future,and it can show the urban economy to a certain extent.The embryonic form of development.In this paper,Jinan is used as the research area,night light data and TM image data are used as data sources.Through the sliding t-test method,the mutation points on the luminous gradient sequence covering the whole city of Jinan are detected and identified,and then Jinan City is delineated separately.In2013 and 2018,the inner and outer boundaries of the urban fringe area of the city were verified and explained by the application of landscape index and information entropy method.In addition,this article analyzes the spatial evolution of urban fringe areas from five aspects:the dynamic evolution of spatial scope,the evolution of construction land,the dynamic characteristics of land use change,the characteristics of landscape pattern,and the rationality of expansion.Policy guidance,road traffic and other aspects have investigated the factors affecting the spatial evolution of urban fringe areas.the result shows:(1)It is an effective method to apply mutation detection method based on night light data to identify and delimit the urban fringe area.This study uses night light data and TM image data as data sources,and uses the sliding t-test method to detect sudden changes in the night light gradient sequence,and delineates the inner and outer boundaries of the urban fringe of Jinan in2013 and 2018,respectively.Divided into three major areas:urban core area,urban fringe area and rural area;and using the landscape pattern index and land use structure information entropy model to test the research results,confirming that the identification method applied in this research is a scientific and feasible method,and The recognition result is reasonable.(2)The area of the urban fringe area of Jinan City was 679 km~2in 2013,and the area of the urban fringe area in 2018 was 862 km~2,with a growth rate of 27%,showing obvious characteristics of the urban core area,urban fringe area,and rural circle structure.Among them,the area of construction land has increased by 3.67%,and the annual expansion area and annual expansion rate of construction land are 23.44km~2and 2.72%respectively,which are in a state of medium-speed expansion;from 2013 to 2018,there are two main types of urban fringe areas in various districts and counties.Leading land use types:cultivated land as the leading factor and construction land as the leading factor;the diversity of landscapes in the suburbs of Jinan City is generally on the rise,and the diversity of land use types is obviously becoming more complicated.(3)The evolution of the urban fringe of Jinan City is affected by many factors such as physical geography,social economy,planning policies,and road traffic.Among them,natural geographical factors restrict the expansion of urban fringe areas.Good road traffic can promote the development of urban fringe areas.However,the fundamental driving force for its expansion is still derived from the urban economic and social development.The formulation of policy planning can affect the development of urban fringe areas.Orderly development plays a guiding role.