sustainability Article Analysis of Inter-Relationships between Urban Decline and Urban Sprawl in City-Regions of South Korea Uijeong Hwang 1 and Myungje Woo 2,* 1 School of City and Regional Planning, Georgia Institute of Technology, 245 4th St NW, Atlanta, GA 30332, USA;
[email protected] 2 Department of Urban Planning and Design, University of Seoul, 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Korea * Correspondence:
[email protected]; Tel.: +82-2-6490-2803 Received: 1 January 2020; Accepted: 18 February 2020; Published: 22 February 2020 Abstract: This paper identifies inter-relationships between the urban decline in core areas and urban sprawl in hinterlands using 50 city-regions of South Korea. We measured decline- and sprawl-related indicators and estimated a simultaneous equations model using Three-Stage Least Squares. The results show that population decline and employment decline have a different relationship with urban sprawl. While population decline has a negative impact on the urban sprawl in the density aspect, employment decline worsens the urban sprawl in the morphological aspect. Another result suggests that the difference is related to declining patterns of population and employment. Cities that are experiencing population decline in the core area are likely to lose population in their hinterlands as well. On the other hand, the employment decline in the core area shows a positive correlation with employment growth in hinterlands. The results imply that suburbanization of jobs and the inefficient land use exacerbate the urban sprawl in the morphological aspect. Thus, local governments should pay attention to migration patterns of employment and make multi-jurisdictional efforts.