Choosing Jiangsu province as the study region, we measure spatial spillovers of 2005-2009 expressway investment based on the key methods including accessibility analysis, extract method, scenario analysis method, region spillover model and inter-regional spillover matrix. Then we monetize spatial spillovers by distributing the costs of the new incremental infrastructures according to the regional distribution of the potential accessibility benefits. Firstly we use network analysis in GIS toolbox to calculate and map economic potential benefit values between the two scenarios based on extract method and then based on these values we can acquire accessibility spillover matrix according to region spillover model. Secondly this matrix is monetized by distributing the costs of the investment in the new incremental infrastructures of the region according to the regional distribution of the economic potential benefits. Thirdly we apply the inter-regional spillover matrix of investments flows to characterize the "inner", "export" and "import" values of each type of the regional expressway investments based on the spatial spillover effects. Furthermore we can estimate the real investment as well as its differences with actual investment. By applying the above methods, we can analyze the potential beneficiaries of the new infrastructure spillovers effects and their spatial distribution.
The result shows that intensity of accessibility spillover effects tends to be weak as the distance to new infrastructure increases on the whole. In addition the new expressway investment gives rise to non-equilibrium effects in the neighbouring regions since the direction and location of the new lines distorts the effect of the distance. Secondly intensity of accessibility spillover effects is more higher in the regions located in the centre than in the periphery of Jiangsu. Besides the periphery is the main region where the spillover effects are imported. Thirdly the transport infrastructure investment in central region can improve the accessibility level of the peripheral region. Furthermore the transport investment of middle region in north Jiangsu can be exported and bring benefits to other regions in Jiangsu by means of spillover effects. At last, as far as the relationship between the spillover and spatial equity is concerned, the downstream effect is greater than upstream effect during Jiangsu expressway building, which explains that spillover effects of all new infrastructure are in favour of narrowing the gap between regional accessibility. The downstream of new infrastructure located in peripheral region is lower, opposite to higher downstream in central region.
JIANG Haibing, ZHANG Wenzhong, QI Yi, ZHOU Liang
. Using accessibility indicators and GIS to assess spatial spillovers of expressway investment：A case study in Jiangsu Province[J]. GEOGRAPHICAL RESEARCH, 2014
, 33(1)
: 71
-82
.
DOI: 10.11821/dlyj201401007
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