| Under the background of the globalization and informationization,the widely used of the Internet has a profound impact on the residents' daily behaviors and activities,thereby affecting the changes of the urban spatial structure.Currently,the study of urban space is facing a transition from focusing on the material space to the social space,the activity space has become one of the hotspots that attracts the urban researchers' attention.Urban agglomeration is the aggregation which involves some cities,its research of activity space should be more attention.At the same time,with the increasing of economic and urbanization,the development and expansion of the urban agglomeration is an inevitable trend of urbanization.The research of urban agglomeration has always been an important topic in the field of human geography and urban and rural planning.In terms to urban agglomeration itself,there is no established administrative boundaries.So the first and foremost,the study should determine the spatial extent.Based on these,the study focus on spatio-temporal figure of urban agglomeration residents' activity and delimitating the spatial boundary with using the theory of "the space of flow" from the perspective of city residents.It is a new attempt of researching urban agglomeration space in the information age.The study has the theoretical and practical significance.This study is based on understanding with the concept of urban agglomeration and reviewing the previous research done by the scholars home and abroad It takes the Yangtze River Delta urban agglomeration as an example,and uses the Sina micro-blog check-in data with network data mining to get 1640017 records about two weeks from December 16,2013 to December 29,2013.Firstly,it analyses urban agglomeration residents' time-space activity with using the kernel density estimation including the rules of people's activity time,the overall characteristics and dynamic changes of urban activity space.And then taking a combination of qualitative and quantitative methods,it makes a comprehensive analysis from four aspects of activity intensity of outreach linked,scale of activity levels,spatial differences of activity intensity and activity concentration degree.Finally,it delimitates the spatial boundary of urban agglomeration in the Yangtze River Delta.The main results are the following:(1)Traditional schedule is still reflected in check-in.There is a corresponding relationship between check-in and time,as well as check-in and activities.(2)Residents' activity space presents level agglomeration of "a nuclear and multi-center",and the "Z" shaped progressively dominate the distribution with a significant trend,while the activity gathering areas mostly distribute along the transportation routes.(3)A dynamic process of activity space with a relatively decentralized space-(6-9am)gathering-(3-6pm)further agglomerating-dispersing(9-12pm),and it relatively gathers in the night(0-3am).(4)The analysis results of delimitating the spatial boundary:?Activity intensity of outreach linked.In the first level are the following cities of Hangzhou,Suzhou,Shanghai and Nanjing.These regional central cities' activity intensity of outreach linked has a significant spatial directivity.?Scale of activity levels.It has a larger spatial differences with presenting a feature of "a nuclear and multi-center".In addition to Shanghai,the activity scale of Suzhou,Nanjing,Hangzhou and Ningbo are also greater,but smaller of Zhenjiang,Huzhou,Taizhou and Zhoushan.?Spatial differences of activity intensity Spatial differences are significant.Greater activity intensity area is taking Shanghai as the core,extending along two directions:along Suzhou-Wuxi-Changzhou stretching to Nanjing;along the line of Shanghai-Hangzhou to Hangzhou,then expanding to Ningbo,and roughly covering the entire Hangzhou Bay.?Activity concentration degree.It has five regional activity centers of Shanghai,Suzhou,Nanjing,Hangzhou,Ningbo,and three regional activity groups of Nanjing-Zhenjiang-Yangzhou,Suzhou-Wuxi-Changzhou and Hangzhou-Huzhou-Jiaxing-Shaoxing.The space partitions based on the activity concentration degree are quite different.(5)The results of delimitating the spatial boundary:taking Shanghai as the core,Nanjing,Hangzhou,Suzhou,Ningbo as the centers,including the Shanghai's municipal district;Nantong's mumicipal district;Taizhou's municipal district,Suzhou City;Wuxi's municipal district,Jiangyin City;Changzhou's municipal district;Zhenjiang's municipal district,Jurong City,Danyang City;Yangzhou's municipal district,Yizheng City;Nanjing City and Jiaxing City;Huzhou's municipal district,Deqing County;Hangzhou's municipal district;Shaoxing's municipal district,Shaoxing County,Zhuji City;Ningbo's municipal district,Yuyao City,Cixi City.There are 32 municipal districts and county-level cities or counties The spatial extent of urban agglomeration residents'activities presents a "Z" shaped distribution in the Yangtze River Delta. |
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