| The new urbanization process puts forward new requirements for China's urbanization process,and the transformation of urban expansion into intensive,intelligent,green and low-carbon development mode is imminent.The continuous expansion of urban space leads to the continuous development of urban boundaries.The extensive expansion mode of urban space has caused the continuous deterioration of the relationship between people and land.It has put forward urgent needs for the rational guidance of urban expansion,especially in the northwest region with fragile ecological environment in China.It is imperative to change the mode of urban expansion..The urban expansion model is an important way to simulate urban expansion,explore the law of urban expansion,and guide the transformation of urban expansion mode.As the second batch of national new urbanization pilot area,Baotou is also the central city of Hu-Bao economic belt and Hu-Bao-Hubei city group.It is a typical resource-based city in the northwest of China.The urban space of Baotou is limited to the natural conditions and is concentrated in the southern part of Baotou and the central and Northern part of the city.The economic development is relatively backward,and the way of urban expansion is different from the southeast coastal areas of China.It is necessary to make reasonable planning to guide the process of urban expansion.In this paper,the dynamic process of urban expansion is simulated as the horizontal movement process of urban construction land,and the urban expansion of Baotou city is simulated from the perspective of regional ecological protection.With the Landsat satellite remote sensingimage as the main data source in 2006,2010 and 2017,the minimum cumulative resistance surface model(MCR)and the ecological resistance surface model(UEER)were constructed to simulate the urban expansion of Baotou city.Using remote sensing and GIS technology,through the supervised classification and the normalized construction index(NDBI)a combination of,extraction of Baotou city construction land,the construction of urban expansion in the "source",based on the urban construction land ecological suitability evaluation index system of building surface minimum cumulative resistance index system,using the minimum cumulative resistance surface model to simulate Baotou city 2006-2010 and 2010-2006 extension,find the minimum cumulative resistance model in simulating the process of urban expansion in some deficiencies,there are many differences between simulation results and the actual urban expansion.Ecological resistance model simulates the Baotou city 2006-2010 and 2010-2006 extension,and the simulation results validate,found that urban expansion in real life to take up some of the farmland,and based on the least resistance surface modified model of ecological resistance model is forbidden to occupy farmland,simulation precision is low,in this paper,the ecological resistance model was improved,in the numerical simulation of urban expansion can be limited farmland,simulation of 2006-2010 and 2010-2017 Baotou city expansion,and the simulation results validate,This paper discusses the feasibility of simulating urban expansion based on ecological perspective,and simulates the urban expansion of Baotou city from 2017 to 2020,and draws the following conclusions:(1)Through multiple access to remote sensing image classification of Baotou city construction land due to vegetation coverage rate is higher,the urban construction land information extraction of the result is not ideal,and NDBI index is based on the construction landin the infrared spectrum and near infrared band reflectance changes in contrast to the other feature information of reflectivity change,the principle of the extraction of urban construction land,NDBI differs from that of supervised classification requires human interpretation,can be independently completed by computer,to avoid interference with human factors.At the same time,the NDBI index method has higher precision in urban construction land extracted during the period of high surface vegetation coverage.Therefore,using the NDBI index method to modify the construction land of supervised classification extraction can improve the extraction accuracy.In 2006,2010 and 2017,the information of urban construction land used for remote sensing image extraction in Baotou city was 85.88%,87.14% and 88.84%,respectively,through the NDBI index method.(2)Based on the minimum cumulative resistance model,the urban expansion of Baotou city is different from that of the actual city.Based on the minimum cumulative resistance model of urban expansion in the simulation results on a large number of cultivated land,ecological conservation and water source,the extended way apparently do not conform to the actual situation of the urban expansion in urban expansion,based on the minimum cumulative resistance surface model to simulate the urban area from 2006 to 2010 increased by 1537 hectares,encroached on455.99 hectares of arable land,277.48 hectares of ecological conservation and 146.16 hectares of water;And based on the minimum cumulative resistance model cities expand simulation results from 2010 to 2017 increased by 3931 hectares,encroached on 1438.75 hectares of arable land,encroached on ecological protection areas of land of 599.48 hectares and 359.68 hectares of water source.(3)Due to minimum cumulative resistance plane model with the actual urban expansion inthe numerical simulation of urban expansion differences,Improved UEER model based on MCR model,joined the rigid constraints as urban expansion of farmland,ecological conservation and water source as ecological barriers of urban expansion,and the expansion of the source of urban expansion ability has carried on the classification,to avoid the spread of urban expansion in present homogenization,build ecological integrated the urban expansion resistance surface ecological resistance to overcome,to simulate the 2006-2010,2010-2017,Baotou city expansion,and Baotou city space scale is verified,It is found that the simulation results can basically reflect the expansion trend of Baotou city,but it is different from the actual urban construction land in Baotou city.UEER model in the simulation of urban expansion in Baotou city in 2006-2010 and obtained through remote sensing image of Baotou city in 2010,comparing the urban construction land simulation accuracy was 65.6%,the simulation of urban expansion in Baotou city in2010-2017 and obtained through remote sensing image of Baotou city in 2017,comparing the urban construction land simulation accuracy of 73.59%.In the process of simulating urban sprawl,the UEER model,as an ecological obstacle to urban sprawl,is forbidden to encroach,which is not consistent with the actual urban expansion.In this paper,the UEER model is partially improved.(4)In the UEER model,the urban expansion is controlled by the urban expansion,and the urban expansion process is simulated.UEER model based on the improved simulation of Baotou city in 2006-2010 extension of simulation results and the extracted by remote sensing image of Baotou city in 2010 of construction land area of 1086.35 hectares,the actual Baotou city in2006-2010 extension 1537 hectares,the UEER model based on the improved simulation of Baotou city in 2006-2010 extension accuracy is 70.68%,compared with the UEER model,simulation precision is increased by 5.08%;Baotou city based on the improved UEER model of urbanexpansion in 2010-2017,the simulation results and extracted by remote sensing image of Baotou city 2017 anastomosis of construction land area of 2945.11 hectares,the actual Baotou city in2010-2017 extension 3931 hectares,the UEER model based on the improved simulation of Baotou city in 2006-2010 extension accuracy was 74.92%,the simulation precision is improved by 1.33%.This paper analyzes the feasibility of ecological resistance surface model based on ecological perspective to simulate urban expansion,and simulates the urban expansion of baotou city from2017 to 2020. |
PDF Full Text Request