scholarly journals Variation Characteristics of Building Height Types in the Vertical Urban Expansion Process

2021 ◽  
Author(s):  
Peifeng Zhang ◽  
Zheng Cheng ◽  
Jianfeng Xu ◽  
Yun Dai ◽  
Xiaolin Qi ◽  
...  
Keyword(s):  
Urban Expansion ◽  
Expansion Process ◽  
Building Height ◽  
Variation Characteristics

scholarly journals Evaluating the Suitability of Urban Expansion Based on the Logic Minimum Cumulative Resistance Model: A Case Study from Leshan, China

2019 ◽  
Vol 8 (7) ◽  
pp. 291 ◽  
Author(s):  
Haijun Wang ◽  
Peihao Peng ◽  
Xiangdong Kong ◽  
Tingbin Zhang ◽  
Guihua Yi
Keyword(s):  
Urban Development ◽  
Evaluation System ◽  
Urban Expansion ◽  
Ecological Impacts ◽  
Sustainable Urban Development ◽  
Expansion Process ◽  
Mountain Areas ◽  
Resistance Factors ◽  
Ecological Barriers

This paper focuses on the suitability of urban expansion in mountain areas against the background of accelerated urban development. Urbanization is accompanied by conflict and intense transformations of various landscapes, and is accompanied by social, economic, and ecological impacts. Evaluating the suitability of urban expansion (UE) and determining an appropriate scale is vital to solving urban environmental issues and realizing sustainable urban development. In mountain areas, the natural and social environments are different from those in the plains; the former is characterized by fragile ecology and proneness to geological disasters. Therefore, when evaluating the expansion of a mountain city, more factors need to be considered. Moreover, we need to follow the principle of harmony between nature and society according to the characteristics of mountain cities. Thus, when we evaluate the expansion of a mountain city, the key procedure is to establish a scientific evaluation system and explore the relationship between each evaluation factor and the urban expansion process. Taking Leshan (LS), China—a typical mountain city in the upper Yangtze River which has undergone rapid growth—as a case study, the logic minimum cumulative resistance (LMCR) model was applied to evaluate the suitability of UE and to simulate its direction and scale. The results revealed that: An evaluation system of resistance factors (ESRFs) was established according to the principle of natural and social harmony; the logic resistance surface (LRS) scientifically integrated multiple resistance factors based on the ESRF and a logic regression analysis. LRS objectively and effectively reflected the contribution and impact of each resistance factor to urban expansion. We found that landscape, geological hazards and GDP have had a great impact on urban expansion in LS. The expansion space of the mountain city is limited; the area of suitable expansion is only 23.5%, while the area which is unsuitable for expansion is 39.3%. In addition, it was found that setting up ecological barriers is an effective way to control unreasonable urban expansion in mountain cities. There is an obvious scale (grid size) effect in the evaluation of urban expansion in mountain cities; an evaluation of the suitable scale yielded the result of 90 m × 90 m. On this scale, taking the central district as the center, the urban expansion process will extend to the neighboring towns of Mianzhu, Suji, Juzi and Mouzi. Urban expansion should be controlled in terms of scale, especially in mountain cities. The most suitable urban size of LS is 132 km2.This would allow for high connectivity of urban-rural areas with the occupation of relatively few green spaces.

Urban Expansion Process, Pattern, and Land Use Response in an Urban Mining Composited Zone from 1986 to 2013

2016 ◽  
Vol 142 (4) ◽  
pp. 04016014 ◽  
Author(s):  
Xiaoran Zhang ◽  
Zhongke Bai ◽  
Xiang Fan ◽  
Yuanqing Lu ◽  
Yingui Cao ◽  
...  
Keyword(s):  
Land Use ◽  
Urban Expansion ◽  
Expansion Process ◽  
Urban Mining ◽  
Process Pattern

scholarly journals URBAN EXPANSION MODELING APPROACH BASED ON MULTI-AGENT SYSTEM AND CELLULAR AUTOMATA

2018 ◽  
Vol XLII-3 ◽  
pp. 2219-2223
Author(s):  
Y. N. Zeng ◽  
M. M. Yu ◽  
S. N. Li
Keyword(s):  
Change Process ◽  
Urban Expansion ◽  
Urban Land ◽  
Kappa Coefficient ◽  
Multi Agent System ◽  
Impervious Surfaces ◽  
Expansion Process ◽  
Multi Agent ◽  
Expansion Model

Urban expansion is a land-use change process that transforms non-urban land into urban land. This process results in the loss of natural vegetation and increase in impervious surfaces. Urban expansion also alters the hydrologic cycling, atmospheric circulation, and nutrient cycling processes and generates enormous environmental and social impacts. Urban expansion monitoring and modeling are crucial to understanding urban expansion process, mechanism, and its environmental impacts, and predicting urban expansion in future scenarios. Therefore, it is important to study urban expansion monitoring and modeling approaches. We proposed to simulate urban expansion by combining CA and MAS model. The proposed urban expansion model based on MSA and CA was applied to a case study area of Changsha-Zhuzhou-Xiangtan urban agglomeration, China. The results show that this model can capture urban expansion with good adaptability. The Kappa coefficient of the simulation results is 0.75, which indicated that the combination of MAS and CA offered the better simulation result.

scholarly journals Examining Small-Town Growth and Expansion in Peri-urban Areas of Small Cities: Evidence from Peripheries of Three Small Cities in Central Java

2021 ◽  
Vol 32 (3) ◽  
pp. 216-232
Author(s):  
Fadjar Hari Mardiansjah ◽  
Agung Sugiri ◽  
Samsul Ma'rif
Keyword(s):  
Urban Areas ◽  
Growth And Development ◽  
Small Town ◽  
Urban Expansion ◽  
Small Towns ◽  
Policy Implications ◽  
Expansion Process ◽  
Small Cities ◽  
Central Java ◽  
Surrounding Areas

Urbanization in small and medium-sized cities in Java is marked by an urban expansion process to the surrounding areas, forming the growing small towns in their peripheries. Using the case of the extended urban areas of Tegal, Pekalongan and Magelang in Central Java, this study examined small-town growth and development in peri-urban areas of small and medium cities. It first looked at the growth of small towns in the peri-urban areas of these small cities and then identified various factors and mechanisms that contribute to the formation, growth and expansion of small towns. The study further looked into the challenges and implications of the trend toward policies for managing such processes more sustainably. The growth of urbanized villages in some kabupatens (non-urban districts or regencies) surrounding these small cities, as documented by the national statistical board  from 1990 to 2017, was used as the basis for analyzing these factors. This paper concludes with a discussion on the challenges and policy implications for growing small towns. The findings of this study can be useful for formulating a better approach to managing urbanization processes in the future.   Abstrak. Urbanisasi kota-kota kecil dan menengah di Jawa ditandai dengan proses perluasan kota ke wilayah sekitarnya, membentuk kota-kota kecil yang berkembang di pinggirannya. Dengan menggunakan kasus perluasan wilayah Tegal, Pekalongan dan Magelang di Jawa Tengah, penelitian ini mengkaji pertumbuhan dan perkembangan kota kecil di wilayah pinggiran kota kecil dan menengah. Ini pertama-tama melihat pertumbuhan kota-kota kecil di daerah pinggiran kota-kota kecil ini dan kemudian mengidentifikasi berbagai faktor dan mekanisme yang berkontribusi pada pembentukan, pertumbuhan, dan perluasan kota-kota kecil. Studi ini lebih jauh melihat tantangan dan implikasi dari tren terhadap kebijakan untuk mengelola proses tersebut secara lebih berkelanjutan. Pertumbuhan desa urban di beberapa kabupaten (kabupaten atau kabupaten non-urban) di sekitar kota-kota kecil tersebut, sebagaimana didokumentasikan oleh BPS (Badan Pusat Statistik) dari tahun 1990 hingga 2017, digunakan sebagai dasar untuk menganalisis faktor-faktor tersebut. Makalah ini diakhiri dengan diskusi tentang tantangan dan implikasi kebijakan untuk pertumbuhan kota-kota kecil. Temuan studi ini dapat berguna untuk merumuskan pendekatan yang lebih baik untuk mengelola proses urbanisasi di masa depan.   Kata kunci. Jawa Tengah, kota kecil, urbanisasi, ekspansi kota.

scholarly journals INFLUENCES OF URBAN EXPANSION ON CULTIVATED LANDS IN CHINA SINCE 1970S

2018 ◽  
Vol XLII-3 ◽  
pp. 1035-1040
Author(s):  
F. Liu ◽  
Z. Zhang ◽  
X. Zhao ◽  
S. Yu ◽  
X. Wang ◽  
...  
Keyword(s):  
Population Size ◽  
Urban Expansion ◽  
Cultivated Land ◽  
Land Loss ◽  
Expansion Process ◽  
Land Protection ◽  
The Past ◽  
The Awakening ◽  
Cultivated Land Protection ◽  
Implementation Stage

Urban expansion has far-reaching influences on cultivated lands, and has a serious effect on grain output and safety. However, relatively little attention has been paid to monitor cultivated land losses through urban expansion over a long timeframe and multi-frequency, especially its differences on national scale systematically. In this work, the characteristics of Chinese cultivated land dynamics were described using annual occupied area per city, contribution rate of cultivated lands to urban expansion and the classification method of basic trend of cultivated land losses. Results indicate that: (1) in the past four decades, large amount of cultivated lands have been occupied during the urban expansion process, and have become the first land source for Chinese urban expansion. (2) Cultivated land loss among municipalities, provincial capitals and other cities was obviously different. The higher of cities’ administrative level was, the more obvious of cultivated land loss in these cities appeared, and the earlier of acceleration loss stage of cultivated lands occurred. (3) Cultivated land loss in five population-size cities was unbalanced, representing obviously different loss process and contribution on urban expansion. The bigger of cities’ population size was, the more obvious of cultivated land loss in these cities appeared, and the earlier of acceleration loss stage of cultivated lands occurred. (4) Cultivated land losses during urban expansion process were imbalanced in China, and were classified into seven trends. (5) Chinese cultivated land protection has been carried out from the awakening stage to the deep implementation stage.

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