Spatio-Temporal Evolution And Driving Forces Of Urban 3D Space Expansion

The three districts of Shaheko u District,Zhongshan District and Xigang District of Dalian C ity are the central urban areas of Dalian C ity.Using the three-dimensional compactness model,urban space growth rate,urban space three-dimensional expansion intensity index and 48-sector analysis method,to explore the spatial-temporal evolution characteristics of the three-dimensional urban space three-dimensional expansion from 2000 to 2015 The five aspects of economic driving,geographic driving,infrastructure driving and living standard driving detect the driving factors of the three-dimensional urban spatial expansion intensity in the three districts from 2000 to 2015.The paper is summarized as follows:(1)In terms of measurement analysis methods,a three-dimensional compactness index model has been innovated.The innovative model calculation process is simpler and its results are more accurate;the three-dimensional growth rate of urban space is proposed to quantitatively measure urban space from the aspects of urban building volume and urban building quantity The growth of three-dimensional buildings has implemented the three-dimensional evolution of urban space in every building;redefining the three-dimensional expansion intensity index of urban space to make it more realistic for urban space management,design and planning;for a more detailed analysis of Dalian According to the morphological characteristics of the research object,based on the previous equal-sector analysis method,the 48-sector analysis method is used to analyze the urban space 3D morphological evolution and the three-dimensional urban space 3D Expansion of relevant driving factors for detection.(2)In the analysis of the spatial and temporal evolution of the study area,the standardized compactness of the three a reas and the three-dimensional expansion of the urban space have increased significantly.The standardized three-dimensional compactness index of the three areas is 0.32 in 2000 and 0.45 in 2015,an increase of 0.13;The expansion direction is mainly diagonally outward along the NW and SE directions of the three districts,and concentrated in the outer suburban coastal areas;during the fifteen years from 2000 to 2015,the comprehensive standardized compactness index of the three districts has been rising at all time periods Trends,no fluctuations in the middle;the three districts add a total of 1912 buildings in addition to the newly rebuilt buildings,of which the largest increase in the number of urban spaces is Beijing streets in the direction of N1;t he building volume of the three districts in 2000 was 218.38 million cubic meters by 2015 The building volume is 2.7549 million cubic meters,which has increased by about 57.11 million cubic meters in 15 years.Among them,the fastest growth rate of urban space volume is Xinggong Street and Zhongshan Park Street in the direction of NWW1 and NW1.(3)In the past 15 years,the degree of impact of various indicators on the three-dimensional expansion of urban space has been ranked as follows: green space> GDP> slope> catering facilities> population> transportation facilities;ecological detection further shows that green space,GDP and slope have the greatest impact on the three-dimensional expansion of urban space,The impact of population and catering facilities is greater,and the impact of transportation facilities is the smallest;interactive detection shows that the influence factors are enhanced between two pairs,including two-factor enhancement and nonlinear enhancement,and there is no independent and weakened relationship;risk detection can know their respective The variables have their own suitable ranges.Among them,the population is 35559-40213 people,the GDP is 167-176 million yuan,the slope is 1.56%-2.67%,the green land is 10.42-11.26 square kilometers,the transportation facilities are 249-396,and the catering 464-634 facilities.