Search

The unprecedented urbanization in China has dramatically changed the urban spatial structure of cities. With the proliferation of individual-level geospatial big data, previous studies have widely used the network abstraction model to reveal the underlying urban spatial structure. However, the construction of network abstraction models primarily focuses on the topology of the road network without considering individual travel flows along with the road networks. Individual travel flows reflect the urban dynamics, which can further help understand the underlying spatial structure. This study therefore aims to reveal the intra-urban hierarchical spatial structure by integrating the road network abstraction model and individual travel flows. To achieve this goal, we 1) quantify the spatial interaction relatedness of road segments based on the Word2Vec model using large volumes of taxi trip data, then 2) characterize the road abstraction network model according to the identified spatial interaction relatedness, and 3) implement a community detection algorithm to reveal sub-regions of a city. Our results reveal three levels of hierarchical spatial structures in the Wuhan metropolitan area. This study provides a data-driven approach to the investigation of urban spatial structure via identifying traffic interaction patterns on the road network, offering insights to urban planning practice and transportation management. [ABSTRACT FROM AUTHOR]

Urban population size dynamic adjustment has been widely studied for a long time; however, the dynamic adjustment at the urban hierarchy level remains unknown. This study utilises China's urban population data to investigate the dynamic adjustment. Specifically, we utilise methods of the Gini coefficient, linear regression, and coefficients of Spearman, and Moran's I to explore the dynamic adjustment tendency, adjustment rate and correlation of urban population size distribution of different urban hierarchies and groups of different urban hierarchies. We find that the urban population size spatial distribution is gradually even within the same urban hierarchy. The adjustment rate to be even of Megacity II is the highest, and Megacity I is the bottom. We also find the population size spatial distribution of the whole urban system is gradually uneven. We explore the dynamic process by sorting urban hierarchies into six groups. Furthermore, we find there is a complex correlation between different urban hierarchies and global spatial correlation among China cities. These results are valuable as references for Chinese policy-makers and practitioners and will enable them to adopt sustainable land use and urban population management measures. The study outcomes will also benefit future studies on spatial population size distribution in international communities. [ABSTRACT FROM AUTHOR]

Studying the structure of polycentric cities can promote a better understanding of urban development and contribute to urban planning. In this study, we identified polycentric cities in China and evaluated the urban centre development level of polycentric cities from new data and method. We used Luojia-1A night-time light (NTL) data, combined with the concept of natural cities (NCs), to identify urban centres and thus identify polycentric cities in China. In addition, we used the urban centre development index (UCDI) to quantify the urban centre development level (UCDL) that represents the overall urban centre development level within a polycentric city. The polycentric cities in China are characterized by the spatial distribution pattern of a larger number in the east and fewer in the west. There are a large number of polycentric cities in eastern China, and the closer to the coastal areas, the more polycentric cities there are. The distribution of UCDL in China's polycentric cities is characterized by significant spatial heterogeneity. UCDLs are generally smaller in polycentric cities in western China. In addition, polycentric cities in northeastern China have smaller UCDL. Polycentric cities with high UCDL are concentrated in the central and coastal regions of China. [ABSTRACT FROM AUTHOR]

The dynamic population distributions by activity type (e.g. working, shopping or in-home) are vital for resource allocation, urban planning and epidemic containment. Although studies have incorporated individual-level human mobility data to map population distribution by activity type, access to such data is hindered due to privacy issues and they rely on auxiliary data to provide priori activity knowledge. This paper presents a method for generating the population dynamics by activity type. We first introduce more readily available sequential snapshot data to construct the population mixture model, then decompose the population mixture, and finally estimate the dynamic population size for each activity. We test the method in the central districts of Guangzhou city, China, based on real-time Tencent user density data. Correlation analysis and accuracy assessment prove that our method can accurately estimate hourly distributions for populations engaging in working, stay-at-home, and socializing activities. The temporal distribution of the working population reproduces the regular work scenarios and socializing population displays complex spatial patterns. We also find that there is an underlying relationship between a region's function and its dynamic population structure. The presented method has great potential for application and could provide new insight for studying urban dynamic functions. [ABSTRACT FROM AUTHOR]

The special planning for shelters is an integral part of overall city planning and is a key issue in solving the urban security problem. During the planning of earthquake emergency shelters, it is usually necessary to prioritize the designated shelters to avoid wasting resources. However, in previous research initiatives, special attention has been given to the general location-allocation model without prior consideration of the designated shelters. This article presents a multi-objective supplemental location-allocation optimization model for earthquake emergency shelters that addresses the concerns related to the designated shelters. This model is believed to remain more consistent with the knowledge of shelter planners and policy makers by incorporating the uncertainties of the temporal dynamics of population distribution and the spatially heterogeneous distribution of evacuees under various earthquake damage scenarios by using the elliptical attenuation model for seismic intensity into the location-allocation problem. A case study of the central area of Beijing, China is presented. A modified particle swarm optimization algorithm is applied to solve the supplemental location-allocation model and the general location-allocation model, and the solutions obtained from the two models are then compared. The results show that the solutions of the supplemental location-allocation model significantly minimized the shelter area by prioritizing the designated shelters. By contrast, without prior consideration of the designated shelters, the shelter areas significantly increased, which slightly decreased the evacuation distance in the general location-allocation model. The policy makers could select solutions from the obtained minimal-area scheme using the supplemental location-allocation model that ensures acceptable evacuation distances and minimal budgets by prioritizing the designated shelters during the phased planning of shelters in Beijing. [ABSTRACT FROM AUTHOR]

Constructing shelters is an important part of earthquake disaster management which involves selecting the location of them and assigning the evacuees to them. For this work, selecting suitable objectives and solution is important. Thus, in this paper, a multi-objective mathematical model with four groups of the objectives, allied with a modified particle swarm optimization algorithm, has been developed to solve the location-allocation problem for earthquake shelter. The four objective groups are: total shelter number (TSN) and total evacuation distance (TED), TSN and total weighted evaluation time (TWET), total shelter area (TSA) and TED, and TSA and TWET. The solutions of the model include the determination of the shelters from the candidates and how to allocate population to them. Then the solutions of the model with four objective groups are given and compared using safety, capacity and investment evaluation index with the case of Chaoyang district of Beijing, China. Related to government's preferences and future city planning, the most suitable model solutions can be chosen to help decide where it is suitable to construct shelters and how to allocate the population. [ABSTRACT FROM AUTHOR]

With the pursuit for global competitiveness and economic growth, Chinese cities have recorded massive urban land expansion. This article examines the effects of development policies and economic restructuring on urban land expansion in China through a case study of Nanjing, representing the rapidly growing and globalizing coastal cities in China. Wei investigate the development process and changing contents of government policies, and analyze development zones and key projects as privileged, trait making, and even path-breaking elements of the development process. We highlight the transition and paradox of the Chinese state in the urban development process, and the broad contexts underlying urban land expansion in Chinese cities. We see urban expansion in China as a process largely responding to top-down policy change and economic transition initiated by the central government. We hold that the role of the state has to be analyzed to understand urban transformation and land expansion, moving beyond local factors of accessibility and feasibility. Development-zone and project fevers, and lagging administrative reforms, however, have made Chinese cities heavy with debt and led to wasteful development, corruption, and social unrest in China. [ABSTRACT FROM AUTHOR]

In geographical analysis, spatial simulation and optimization are usually separate processes tackling different problems. It is, however, increasingly necessary to integrate them. Particularly in a fast developing area, the development to be simulated is seldom inertial (i.e., strictly following the historical trend); instead, it is likely to be interfered by new planning measures. Meanwhile, in such an area an optimization plan might not be even meaningful if it only addresses a snapshot of a highly dynamic landscape. In this study, we explored the possibility of integrating cellular automata (CA), a widely used method for simulating urban development and land use changes, and ant colony optimization (ACO), an advanced technique for solving complex path optimization problems. We named the resulting integrated system the geographical simulation and optimization system (GeoSOS) and applied it to a case study concerning finding the optimal path for a planned expressway in Dongguan, a fast-growing city in one of the most economically active regions of China. In the case study, the CA component of the GeoSOS generated simulations of the industrial land use changes for some years in the next decade. The ACO component of the GeoSOS, which had been revised from the conventional ACO to work on raster surfaces, took the simulations as input and completed raster-based path optimizations. In terms of the cumulative utility, a measurement used to evaluate the performance of the optimization, the coupling method surpasses the noncoupling method by 10.3 percent. [ABSTRACT FROM AUTHOR]

During the transition towards a more market-oriented economy and entrepreneurial governance, local authorities have attempted to create new cross-jurisdiction regional entities to enhance their competitiveness through making city-region plans or regional strategic plans in China. This article analyses the process of region building in China through a case study of Nanjing city-region. We argue that region building is a state-led regional project in China, not a spontaneous process. City-region planning has played a legitimacy-seeking role in the construction of new regions. Based on the discourse provided by the city-region plan, associated city networks are being created as a mechanism for plan implementation and regional coordination. This signals that regional planning is entering the stage of regional institution building. By assessing the capacity of regional institutions, we argue that the newly-emerged regional institutions or urban networks have facilitated regionalization in terms of the increasing involvement of non-state actors, the formation of regional coherence and identity and the enhanced inter-city co-operation. However, it is still difficult to establish effective regional governance due to competing local governments, the arbitrary political leadership and the fragmented planning functions. [ABSTRACT FROM AUTHOR]

The widespread use of Western classical forms in China’s recent building boom demonstrates that the process of formalizing and ennobling a locally and spontaneously created building form can also be inverted, wherein a high architecture is appropriated and vernacularized into a mainstream architecture in a different cultural setting. In this article, I examined the recent popularity of Western classical architecture in China and its historical, social, and cultural conditions. Focusing on the ideological implications of the style, I also investigated the dynamic application of the classical forms and their iconographical effects on China’s constructed landscape. [ABSTRACT FROM AUTHOR]

The research, built work and design seminar entitled “The Politics of the Object: Transformative Public and Cultural Landscapes” examined the critical history of a 150-year old open air market in a dense urban area of Hong Kong. This culminated in a series of built installations that used light as a critical design medium to engage the public on urban renewal issues and questions of rapid development in Hong Kong. This ongoing educational initiative aimed to encourage debate about the issues of planned development and the neighborhood’s preservation of cultural values. [ABSTRACT FROM AUTHOR]

Discusses the reasons behind Beijing's dual central business district. Background on China's transitional economy; Emergence of a real estate market; Suggested locations for a central business district; Spatial separation of domestic and internationally oriented activities; Locational choices of organizations.

Urban clusters were the dominant form of cities along the Middle Niger (West Africa) from the inception of urbanism in the first centuries B. C. Many discrete habitation mounds, in close proximity, were occupied simultaneously and together functioned as home to a heterogeneous population that provided diverse services to a wider hinterland. Remarkably similar settlement processes characterized late Neolithic and early Bronze Age China. An examination of why the urban character of these cities was for so long nearly invisible to archaeologists serves to reveal the value-laden nature of our theories about urbanization. A brief review of traditional social thought about the role of early cities illustrates the ways in which the character of urban clusters deviate from scholars' traditional expectations of the physical plan of cities. Such expectations of the underlying social dynamics of early cities presumed the imposition of a coercive state apparatus forcing a heterogeneous population to crowd together, facilitating central control. This article illustrates other mechanisms by which the potential for conflict between corporate groups could have been reduced. The ambiguity of membership had to be resolved and prevented from growing intolerable as former villages became increasingly pluralistic. The elements of urban clusters served as symbols communicating a sense of corporate belonging and, by resolving ambiguities, contributed to the success of early urbanism. [ABSTRACT FROM AUTHOR]

Examines the economic and administrative changes in Lijin County and Lijin Zhen during the period of economic reform in China. Town planning; Population growth; Sectoral planning; Comprehensive development; Construction of the trade center in 1992; Urban development of Lijin Zhen; Open market in 1994.

Examines the effects of recent urban planning, of industrial, commercial, and transportation development, and of housing construction on the morphology of the city of Beijing, China. Transformation of Beijing from socialist city of undifferentiated low-rise districts to a high-rise metropolis; Elements of change; Blend of urban-planning ideals with traditional and socialist Chinese urbanism.