Abstract:

The construction of the Cross Yangtze Bridge will improve the 〖JP2〗level of related towns’ accessibility〖JP〗 and better towns’ location condition by reducing time distance between town and main city,which drive towns’ economic development.In order to quantitatively evaluate the effect of the bridge on the towns’ accessibility and the urban system,we took SuTong Yangtze Bridge for examples 〖JP2〗and select the accessibility〖JP〗 indicator,the potential model and fieldstrength index to analyze towns’ accessibility spatial pattern and town system in study area before and after SuTong Yangtze River Bridge opened to traffic by using the cost weighted distance analysis in geographic information system.The result indicates that the significant changes in location advantage potential and accessibility take place in eastern Nantong and near the bridge.The overall towns’ level of accessibility and location potential advantage have some growth in study region.Smaller change takes place toward the whole town accessibility spatial pattern after the bridge were completed,which shows accessible value growth trend from east to west in the south of the Yangtze River and from west to east in the north of the River.Small change occurs in town spatial system and the most change exists near both sides of the bridge.The overall fieldstrength shows gradually decrease from southwest to northeast in study area.The above conclusion indicates that the bridge optimize the location conditions of the eastern Nantong, which make towns in their region more quickly and comfortably accept the developed regions “spillover effect” of industry and knowledge,speed up industry of the southern Jiangsu transfer toward eastern Nantong and promote to balance regional development