Analysis On The Characteristics And Effect Of Rural Residential Settlement Consolidation In Chengdu Based On Multi-source Data

In the context of the transformation of rural land use structure in my country,the hollowing of rural areas and the idle and abandoned settlements,rural settlement improvement is considered as an effective policy to solve the agricultural and rural development problems as a way to intensively save and use and optimize the land spatial structure.In the past,scholars mainly used single data to carry out relevant research work such as land saving,agriculture and ecological benefits after rural settlement remediation.U sing multiple data from different perspectives such as human-land relationship,few studies on the characteristics and effects of rural residential remediation analysis.This study takes Chengdu as an example,and takes the areas of Chengdu’s five functional areas（"DONGJIN","XIKONG","BEIGAI","NANTUO",and "ZHONGYOU"）that have been renovated in rural settlements（remediation areas）For the research object,the method of using space for time,using three types of main data such as land survey data,geospatial data and mobile phone signaling,is to analyze the charact eristics and effects of rural residential settlement remediation in Chengdu from multiple perspectives.First,based on the land survey data of the remediation area and the non-remediation area,the nearest neighbor statistics,Voronoi diagram analysis and landscape index method were used to analyze the spatial layout characteristics of the remediation area and non-remediation area of the rural settlements.Second,the use of geospatial data from From the perspective of influencing factors,GIS spatial analysis was used to discuss the distribution characteristics of rural settlements in remediation areas and non-remediation areas from topography,river waters,road traffic,and built-up areas.Finally,based on mobile phone signaling data,the remediation areas and The frequency,diversity and scope of activities of daily spatial activities of rural residents in non-remediation areas are analyzed from the perspective of big data before and after remediation.The characteristics of rural residents’ spatial activities are analyzed.Provide scientific reference for the improvement of point remediation policies and measures.The main conclusions of this study are as follows:（1）From the perspective of the spatial distribution of rural settlements,the overall spatial distribution of rural settlements in Chengdu is more uniform than the random model（R>1）.Among the functional areas,the most evenly distributed is the "DONGJIN" area（Z=4.82,Cv=99.67%）,and the most concentrated is the "XIKONG" area（Cv=296.56%）.The number density of plaques in remediation areas is higher than that in non-remediation areas,and the area of plaques in remediation areas of rural settlements is smaller.（2）From the point of view of the distribution characteristics of rural settlements,the closer the distance to the water system,the more concentrated the rural settlements and the larger the scale,and the lower the fragmentation;the distance from the road has the smallest impact on the rural settlements in the "DONGJIN" area.The area most affected by road distance is the remediation area of the "BEIGAI" area;the distance from the built-up area has the least impact on the rural settlements in the "DONGJIN" area,and the remediation area of each area is more affected by the distance from the built-up area than the nonremediation area;The reform of rural settlements in the "BEIGAI","DONGJIN" and "XIKONG" areas played a role in letting farmers "down the mountain",and the reform of rural settlements in the "BEIGAI" area played a role in letting rural residents "downhill".（3）From the perspective of the characteristics of farmers’ spatial activities,the rural population of Chengdu shows a trend of gathering in the main urban area during the day and spreading out from the main urban area at night.About 7% of the rural labor force commutes to the urban area every day;Rehabilitation of residential areas reduces the frequency of rural residents’ travel;in terms of activity space diversity,in addition to the "DONGJIN" area,there are more travel locations in the remediation area than nonremediation areas in the other four functional areas;in terms of scope of activities,working days The average travel d istance of the remediation area is 124.76 m farther than that of the non-remediation area.The travel distance of the non-working day remediation area is502.85 m closer than that of the non-remediation area.It can be seen that the remediation of residential areas has expanded the working distance and shortened the distance of daily life.Conducive to the production and life of rural residents.According to the survey data,from the results of daily trips,the number of rural residents in the remediation area（1.705）is less than that in the non-remediation area（1.839）,but the average distance traveled in the remediation area（6686.39 m）is greater than that in the non-remediation area（6396.6m）The working distance was increased by 577.73 m in the travel changes in the remediation area.These conclusions once again verified the analysis results of mobile phone signaling big data;according to the satisfaction survey results,overall,rural residents are affirmative and supportive of residential remediation work attitude.（4）Based on the analysis results,this paper proposes that each sub-district can carry out remediation work to relocate old villages,merge new villages,integrate internally,and urbanize in situ to improve land use efficiency;after remediation,the cultivated land should be redistributed according to the actual situation of the new district,or Circulate the land;combined with the analysis of natural resource carrying capacity,increase the intensity of guiding ecological migration in rural settlements.