scholarly journals Assessment of Urban Ecological Quality and Spatial Heterogeneity Based on Remote Sensing: A Case Study of the Rapid Urbanization of Wuhan City

2021 ◽  
Vol 13 (21) ◽  
pp. 4440
Author(s):  
Jingye Li ◽  
Jian Gong ◽  
Jean-Michel Guldmann ◽  
Jianxin Yang
Keyword(s):  
Remote Sensing ◽  
Sustainable Development ◽  
Ecological Environment ◽  
Significant Heterogeneity ◽  
Ecological Quality ◽  
City Center ◽  
Wuhan City ◽  
Rapid Urbanization ◽  
Urban Sustainable Development ◽  
The City

Rapid urbanization significantly affects the productivity of the terrestrial ecosystem and the foundation of regional ecosystem services, thereby detrimentally influencing the ecological environment and urban ecological security. The United Nations’ Sustainable Development Goals (SDGs) also require accurate and timely assessments of where people live in order to develop, implement and monitor sustainable development policies. Sustainable development also emphasizes the process of protecting the ecological environment for future generations while maintaining the current needs of mankind. We propose a comprehensive evaluation method for urban ecological quality (UEQ) using Landsat TM/ETM+/OLI/TIRS images to extract remote sensing information representing four ecological elements, namely humidity, greenness, heat and dryness. An improved comprehensive remote sensing ecological index (IRSEI) evaluation model is constructed by combining the entropy weight method and principal component analysis. This modeling is applied to the city of Wuhan, China, from 1995 to 2020. Spatial autocorrelation analysis was conducted on the geographic clusters of the IRSEI. The results show that (1) from 1995 to 2015, the mean IRSEI of Wuhan city decreased from 0.60 to 0.47, indicating that environmental deterioration overwhelmed improvements; (2) the global Moran’s I for IRSEI ranged from 0.535 to 0.592 from 1995 to 2020, indicating significant heterogeneity in its spatial distribution, highlighting that high and low clusters gradually developed at the edge of the city and at the city center, respectively; (3) the high clusters are mainly distributed in the Huangpi and Jiangxia districts, and the low clusters at the city center, which exhibits a dense population and intense human activity. This paper uses remote sensing index methods to evaluate UEQ as a scientific theoretical basis for the improvement of UEQ, the control of UEQ and the formulation of urban sustainable development strategies in the future. Our results show that the UEQ method is a low-cost, feasible and simple technique that can be used for territorial spatial control and spatiotemporal urban sustainable development.

Research on Optimization of China’s Urban Indemnificatory Housing Supply

2012 ◽  
Vol 479-481 ◽  
pp. 1318-1324
Author(s):  
Zhi Qing Li ◽  
Jin Xin Tian ◽  
Tian Hua Song
Keyword(s):  
Sustainable Development ◽  
Robust Optimization ◽  
Security System ◽  
Uncertain Demand ◽  
Box Constraints ◽  
Housing Provision ◽  
Rapid Urbanization ◽  
The Past ◽  
Housing Security ◽  
Urban Sustainable Development

The contradiction between the effective supply and the uncertain demand in housing security system, which is an important part of the urban social security system, has been a major obstacle to urban sustainable development since 1998, and how to effectively deal with it is becoming more and more important. In this paper, the uncertain demand of indemnificatory housing, which was caused by the rapid urbanization, is considered, and the models for indemnificatory housing provision under box constraints, ellipsoid constraints and polyhedral constraints are constructed respectively by using distributional robust optimization, and at the same time, the reliability of optimal models in theory is proved in the form of theorem. In the end, as application of models, the paper takes Beijing as an example, and conducts empirical research on provision of indemnificatory housing during the past five years (2006-2010), which shows the effectiveness of the method.

scholarly journals Políticas públicas e desenvolvimento urbano sustentável

2004 ◽  
Vol 9 ◽  
Author(s):  
Paulo Rolando De LIMA ◽  
Eduardo L. KRÜGER
Keyword(s):  
Land Use ◽  
Sustainable Development ◽  
Spatial Distribution ◽  
Public Policies ◽  
Sustainable Cities ◽  
Agenda 21 ◽  
Urban Sustainable Development ◽  
Environmental Objectives ◽  
The City ◽  
Future Condition

Considerando que o processo de desenvolvimento urbano implica na multiplicação dos impactos ambientais decorrentes do assentamento humano sobre a área de influência da cidade e a existência de diretrizes de ação visando à promoção da sustentabilidade urbana na Agenda 21 brasileira, bem como nas disposições do Estatuto da Cidade, especialmente no que se refere aos objetivos da política urbana, garantia do direito a cidades sustentáveis, planejamento do desenvolvimento urbano, estudo de impacto de vizinhança e ao Plano Diretor, o trabalho aponta possibilidades de efetivação destas diretrizes e dispositivos legais no gerenciamento urbano por meio de políticas públicas locais no âmbito dos transportes, habitação e uso do solo. Tais políticas deverão estar dirigidas a objetivos ambientais definidos em função do grau de qualidade ambiental urbana presente e da eqüidade da sua distribuição espacial, visando a uma situação futura desejada. Public policies and urban sustainable development Abstract Considering that urban development is directly related to the spreading of environmental impacts caused by human settlements within city limits and the existence of directives in the Brazilian Agenda 21 regarding the promotion of urban sustainability, as well as the content of the City Statute regarding urban policies towards sustainable cities and urban planing, this study presents possibilities of implementing directives and legal measures for urban management by means of local public policies concerning transportation, habitation and land use. Such policies should be directed towards environmental objectives, defined with regard to the present urban environmental quality and spatial distribution, aiming at a desired future condition.

The Holistic Urban Planning Approach of Urban Sustainable Development

2011 ◽  
Vol 280 ◽  
pp. 58-61
Author(s):  
Hong Xu
Keyword(s):  
Complex System ◽  
Sustainable Development ◽  
Urban Planning ◽  
Complexity Theory ◽  
Harmonious Society ◽  
Development Patterns ◽  
Urban Sustainable Development ◽  
Planning Approach ◽  
Holistic Analysis ◽  
The City

The lacking of holistic analysis in urban planning is urgent in China. This paper start from complexity theory to analyze and study the urban development patterns in urban planning of China cities. This paper analyzes the need of holistic analysis in the process of urban planning. This need is very important for the current process of urban modernization and the building of harmonious society in China. As discussed in this paper, we must make an effort to improve urban planning by virtue of choosing a very clear direction according to the nature of urban planning. From the perspective of different disciplines to understand the city and urban planning, we can able to make a complex system of our city and complex understanding of things deviation reduced, and finally effectively promote the development of the city.

scholarly journals A soundscape analysis for selected parks in Bydgoszcz

2018 ◽  
Vol 45 ◽  
pp. 00097
Author(s):  
Małgorzata Sztubecka
Keyword(s):  
Sustainable Development ◽  
Sound Level ◽  
Green Spaces ◽  
Future Generations ◽  
Subjective Perception ◽  
Negative Effects ◽  
City Center ◽  
The City

Areas that are considered human-friendly are green spaces. The existing urban parks are designed to fulfill the role of relaxation, recreation, and entertainment. However, in many cases, these are historic places, which at the time didn't have much of an impact on external factors. Sustainable development issues are related to the quality of life and the usage of the environment and its resources by present and future generations. Noise and noise protection is an issue that is part of sustainable development. The inadequate implementation of the principles of sustainable development and non-inclusion of noise can noticeably lead to negative effects now and in the future. The aim of the paper is to analyze the soundscapes of two Bydgoszcz parks located in the city center. The values of the equivalent sound level for these areas were obtained from the existing Bydgoszcz acoustic plan. Subsequently, the resulting distribution of noise was compared with the results of subjective perception of sounds by visitors. On this basis, conclusions can be drawn regarding the ways of shaping such areas while taking into account the perception of visitors.

scholarly journals Observation of Surface Displacement Associated with Rapid Urbanization and Land Creation in Lanzhou, Loess Plateau of China with Sentinel-1 SAR Imagery

2021 ◽  
Vol 13 (17) ◽  
pp. 3472
Author(s):  
Yuming Wei ◽  
Xiaojie Liu ◽  
Chaoying Zhao ◽  
Roberto Tomás ◽  
Zhuo Jiang
Keyword(s):  
Remote Sensing ◽  
Loess Plateau ◽  
High Precision ◽  
Large Scale ◽  
Surface Displacement ◽  
Optical Remote Sensing ◽  
Consolidation Process ◽  
Rapid Urbanization ◽  
Sar Imagery ◽  
The City

Lanzhou is one of the cities with the higher number of civil engineering projects for mountain excavation and city construction (MECC) on the China’s Loess Plateau. As a result, the city is suffering from severe surface displacement, which is posing an increasing threat to the safety of the buildings. However, up to date, there is no comprehensive and high-precision displacement map to characterize the spatiotemporal surface displacement patterns in the city of Lanzhou. In this study, satellite-based observations, including optical remote sensing and synthetic aperture radar (SAR) sensing, were jointly used to characterize the landscape and topography changes in Lanzhou between 1997 and 2020 and investigate the spatiotemporal patterns of the surface displacement associated with the large-scale MECC projects from 2015 December to March 2021. First, we retrieved the landscape changes in Lanzhou during the last 23 years using multi-temporal optical remote sensing images. Results illustrate that the landscape in local areas of Lanzhou has been dramatically changed as a result of the large-scale MECC projects and rapid urbanization. Then, we optimized the ordinary time series InSAR processing procedure by a “dynamic estimation of digital elevation model (DEM) errors” step added before displacement inversion to avoid the false displacement signals caused by DEM errors. The DEM errors and the high-precision surface displacement maps between December 2015 and March 2021 were calculated with 124 ascending and 122 descending Sentinel-1 SAR images. By combining estimated DEM errors and optical images, we detected and mapped historical MECC areas in the study area since 2000, retrieved the excavated and filling areas of the MECC projects, and evaluated their areas and volumes as well as the thickness of the filling loess. Results demonstrated that the area and volume of the excavated regions were basically equal to that of the filling regions, and the maximum thickness of the filling loess was greater than 90 m. Significant non-uniform surface displacements were observed in the filling regions of the MECC projects, with the maximum cumulative displacement lower than −40 cm. 2D displacement results revealed that surface displacement associated with the MECC project was dominated by settlements. From the correlation analysis between the displacement and the filling thickness, we found that the displacement magnitude was positively correlated with the thickness of the filling loess. This finding indicated that the compaction and consolidation process of the filling loess largely dominated the surface displacement. Our findings are of paramount importance for the urban planning and construction on the Loess Plateau region in which large-scale MECC projects are being developed.

scholarly journals Car ownership and commuting mode of the “original” residents in a high-density city center: A case study in Shanghai

2021 ◽  
Vol 14 (1) ◽  
pp. 105-124
Author(s):  
Tao Chen ◽  
Haixiao Pan ◽  
Yanbo Ge
Keyword(s):  
Public Transportation ◽  
Central Area ◽  
High Density ◽  
Easy Access ◽  
Urban Structure ◽  
City Center ◽  
Rapid Urbanization ◽  
Multinomial Logistic Model ◽  
The Impact ◽  
The City

As a result of rapid urbanization and motorization in China, numerous mega-cities have emerged, and large numbers of people live and work in the city centers. Consequently, developing a public transport-oriented urban structure and promoting sustainable development are major planning strategies for the country. To understand the impact of rail transit on motorization in a high-density city center, we conduct a household travel survey in three neighborhoods around metro stations in the central area of Shanghai. We examine the car buying and commuting behavior of those Shanghai “original” residents who lived there when the city began growing, engulfing them in the center. Studies have shown that 40 percent of commuters in the city center commute outward, following a virtually reversed commute pattern, and the factors significantly affecting their car purchasing choice include their attitude toward cars and transit, household incomes, ownership of the apartments they live in, and the distance between family members’ workplaces and nearest metro stations. Despite easy access to the metro from their home in the city center, those who purchase their apartment units also likely own a car, while those who rent their apartment units are less likely to own a car; however, these odds are still higher than for those who live in an apartment unit inherited from their relatives or provided by their company. In the city center, if a family owns a car, then that car would almost certainly be used for daily commuting. A multinomial logistic model is applied to examine the factors influencing the tendency for using cars. The results show that people’s choices of commuting by alternative modes rather than cars are also shaped by their attitude toward public transportation, but other factors can also subtly change people’s commuting behavior under certain conditions. The commuting distance discourages people from walking and taking buses (but not metro). As the egress distance to the workplace increases, the metro becomes less appealing than cars. Mixed land use encourages people to walk or take buses instead of driving. Older people prefer riding buses and walking to driving, and female respondents tend to prefer walking, cycling, and riding the metro to driving compared to male respondents. These findings contribute to understanding the behavior of people who are familiar with public transportation and how to encourage them to switch from driving cars to alternative transport modes.

scholarly journals ECOLOGICAL SECURITY PATTERN FOR THE LANDSCAPE OF MESOSCALE AND MICROSCALE LAND: A CASE STUDY OF THE HARBIN CITY CENTER

2015 ◽  
Vol 23 (3) ◽  
pp. 192-201 ◽  
Author(s):  
Zhang YUANJING ◽  
Yu BINYANG ◽  
Muhammad Aqeel ASHRAF
Keyword(s):  
Reference Value ◽  
Ecological Environment ◽  
Ecological Security ◽  
City Center ◽  
Ecological Corridor ◽  
Security Pattern ◽  
Distance Model ◽  
Harbin City ◽  
Data Source ◽  
The City

The city center planning based on the ecological security pattern of the landscape plays an important role in protecting the healthy operation of the urban ecological environment. This paper takes the city of Harbin of Heilongjiang Province as the target of research, the data during 2011 and 2012 relating to the overall urban planning of Harbin as the data source, and the extraction of the study domain based on the principle of landscape ecology as the ecological source. Also, we take the cumulative cost distance model to create the ecological corridor and the ecological nodes, build the spatial pattern of the city center based on the ecological security pattern of the landscape, and develop the strategy to protect the ecological security pattern of the city center landscape. This study has a pivotal reference value for guiding the city’s overall planning and protecting the ecological environment of the region.

Study on Urban Sustainable Development Based on System Dynamics

2014 ◽  
Vol 587-589 ◽  
pp. 171-175
Author(s):  
Jian Ping Li ◽  
Han Ming Duan ◽  
Min Qiu
Keyword(s):  
Sustainable Development ◽  
System Dynamics ◽  
Northwest China ◽  
System Dynamics Model ◽  
Dynamics Model ◽  
Urban Sustainable Development ◽  
The Status ◽  
City System ◽  
The Impact ◽  
The City

A system dynamics model of urban sustainable development is provided, and the impact of different development modes on the city system is explored. Statistical data of Yinchuan, a city in northwest China, is utilized to build the model which shows the population-economy- environment relationship. Four development modes are proposed, and they are maintaining the status quo, developing secondary industry, developing tertiary industry, developing economy and society together. The system dynamics model is employed to analyze the interaction between population, economy and environment. According to simulation of the system dynamics model, impact of development modes on the city system is predicted. Furthermore, suggestions on improving the sustainability of urban development are put forward. In a word, the paper presents a new idea for the study on urban sustainable development in northwest China.

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