scholarly journals Emergence of spatial transitions in urban congestion dynamics

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Aniello Lampo ◽  
Javier Borge-Holthoefer ◽  
Sergio Gómez ◽  
Albert Solé-Ribalta
Keyword(s):  
Urban Areas ◽  
Road Networks ◽  
City Center ◽  
Traffic Dynamics ◽  
Design And Optimization ◽  
Spatial Properties ◽  
Realistic Situation ◽  
Geographical Regions ◽  
Edge Distribution ◽  
The City

AbstractThe quantitative study of traffic dynamics is crucial to ensure the efficiency of urban transportation networks. The current work investigates the spatial properties of congestion, that is, we aim to characterize the city areas where traffic bottlenecks occur. The analysis of a large amount of real road networks in previous works showed that congestion points experience spatial abrupt transitions, namely they shift away from the city center as larger urban areas are incorporated. The fundamental ingredient behind this effect is the entanglement of central and arterial roads, embedded in separated geographical regions. In this paper we extend the analysis of the conditions yielding abrupt transitions of congestion location. First, we look into the more realistic situation in which arterial and central roads, rather than lying on sharply separated regions, present spatial overlap. It results that this affects the position of bottlenecks and introduces new possible congestion areas. Secondly, we pay particular attention to the role played by the edge distribution, proving that it allows to smooth the transitions profile, and so to control the congestion displacement. Finally, we show that the aforementioned phenomenology may be recovered also as a consequence of a discontinuity in the node’s density, in a domain with uniform connectivity. Our results provide useful insights for the design and optimization of urban road networks, and the management of the daily traffic.

scholarly journals A Model for Complex Subsidence Causality Interpretation Based on PS-InSAR Cross-Heading Orbits Analysis

2019 ◽  
Vol 11 (17) ◽  
pp. 2014 ◽  
Author(s):  
Bahaa Mohamadi ◽  
Timo Balz ◽  
Ali Younes
Keyword(s):  
Regression Analysis ◽  
Urban Areas ◽  
Rock Type ◽  
Linear Regression Analysis ◽  
City Center ◽  
Causal Factors ◽  
Final Model ◽  
Alexandria City ◽  
The City ◽  
Central South

Urban areas are subject to subsidence due to varying natural and anthropogenic causes. Often, subsidence is interpreted and correlated to a single causal factor; however, subsidence is usually more complex. In this study, we adopt a new model to distinguish different causes of subsidence in urban areas based on complexity. Ascending and descending Sentinel-1 data were analyzed using permanent scatterer interferometry (PS-InSAR) and decomposed to estimate vertical velocity. The estimated velocity is correlated to potential causes of subsidence, and modeled using different weights, to extract the model with the highest correlations among subsidence. The model was tested in Alexandria City, Egypt, based on three potential causes of subsidence: rock type, former lakes and lagoons dewatering (FLLD), and built-up load (BL). Results of experiments on the tested area reveal singular patterns of causal factors of subsidence distributed across the northeast, northwest, central south, and parts of the city center, reflecting the rock type of those areas. Dual causes of subsidence are found in the southwest and some parts of the southeast as a contribution of rock type and FLLD, whereas the most complex causes of subsidence are found in the southeast of the city, as the newly built-up areas interact with the rock type and FLLD to form a complex subsidence regime. Those areas also show the highest subsidence values among all other parts of the city. The accuracy of the final model was confirmed using linear regression analysis, with an R2 value of 0.88.

scholarly journals PARKING SPACES NEAR MASS GRAVITY CENTERS IN URBANIZED TERRITORIES: METHODOLOGY FOR ESTIMATING THE REQUIRED PLACES

2020 ◽  
Vol 17 (1) ◽  
pp. 72-83
Author(s):  
A. V. Zedgenizov ◽  
A. V. Bazan
Keyword(s):  
Urban Areas ◽  
Normative Values ◽  
Affecting Factors ◽  
Practical Application ◽  
City Center ◽  
Gravity Center ◽  
Transport Services ◽  
Financial Interest ◽  
Retail Outlets ◽  
The City

Introduction. The paper discusses the problems of organizing the vehicles’ parking near large shopping centers and also describes their relevance, taking into account the transport services of retail outlets and residence places. The authors present the research of the problem by leading scientists, which is reflected in the regulatory documentation.Materials and methods. The authors used a mathematical description of the average parking duration and identified the main affecting factors, taking into account the proportion of workers in the mass gravity center. The authors proposed a mathematical dependence based on the average parking duration, taking into account reservation of parking places for workers and the required number of parking spaces for other categories. The paper considered the possibility of the intra-hour deficit of parking places based on the PHF-factor.Results. As a result, the authors made the comparison of the obtained values of the required parking spaces with the standard ones. The paper provided more than 30 types of mass gravity centers and urban areas. In addition, the authors considered the examples of assessing the required number of parking spaces near a large housing estate at the 8 km distance from the city center. Therefore, the authors proposed the technique for assessing the required number of parking spaces based on normative values per 100 m2 of the area of the mass gravity centers.Discussion and conclusions. The authors present recommendations are made for the practical application of the required number of parking spaces by the normative values.Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.

scholarly journals Identifying Urban Structure Based on Transit-Oriented Development

2019 ◽  
Vol 11 (24) ◽  
pp. 7241
Author(s):  
Yingqun Zhang ◽  
Rui Song ◽  
Rob van Nes ◽  
Shiwei He ◽  
Weichuan Yin
Keyword(s):  
Urban Areas ◽  
Spatial Organization ◽  
Network Activity ◽  
Human Model ◽  
Urban Structure ◽  
Transit Oriented Development ◽  
City Center ◽  
Fast Development ◽  
Transportation Development ◽  
The City

The fast development of urbanization has led to imbalances in cities, causing congestion, pollution, and urban sprawl. In response to the growing concern over the distribution of demand and supply, a more coordinated urban structure is addressed in comprehensive planning processes. In this study, we attempt to identify urban structure using a Network–Activity–Human model under the Transit-Oriented Development (TOD) concept, since TOD is usually regarded as an urban spatial planning tool. In order to explore the strengths and weaknesses of the urban structure, we define the TOD index and unbalance degree and then classify the urban areas accordingly. We take the city of Beijing as a case study and identify nine urban types. The results show a hierarchical urban structure: the city center covers most of the hotspots which display higher imbalances, the surroundings of the city center are less developed, and the city edges show higher potentials in both exploitation and transportation development. Moreover, we discuss the extent to which the spatial scale influences the unbalance degree and apply a sensitivity analysis based on the goals of different stakeholders. This methodology could be utilized at any study scale and in any situation, and the results could offer suggestions for more accurate urban planning, strengthening the relationship between TOD and spatial organization.

scholarly journals The Influence of Urban Conditions on the Phenology of Aesculus hippocastanum L. Using the Example of Wroclaw (Poland)

Forests ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1261
Author(s):  
Iwona Dominika Orzechowska-Szajda ◽  
Robert Krzysztof Sobolewski ◽  
Joanna Lewandowska ◽  
Paulina Kowalska ◽  
Robert Kalbarczyk
Keyword(s):  
Land Cover ◽  
Urban Space ◽  
Urban Areas ◽  
Negative Impact ◽  
Vegetation Period ◽  
Aesculus Hippocastanum ◽  
Horse Chestnut ◽  
City Center ◽  
The Impact ◽  
The City

The differences in plant phenology between rural and urban areas are the subject of research conducted all over the world. There are few studies aimed at assessing the impact of the urban heat island on plant vegetation only in urban areas. The aim of this study is to assess the impact of the distance from the city center and the form of land cover on the phenological development of trees using the example of the horse chestnut (Aesculus hippocastanum L.). The research area covered the entire city of Wrocław. In order to best capture the impact of the distance from the city center on the rate of changes of individual phenophases, 3 areas were designated—at a distance of 1 km, 2 km and 5 km. The study assessed the average duration of individual phenological phases along with the variability characteristics for leafing, flowering and fruiting in relation to the designated zones and classified forms of land cover based on mean value (x¯) and standard deviation (±SD) in individual weeks of the year. For the leafing and flowering phases, the frequency of the occurrence of phases in individual weeks of the year was analyzed in relation to the designated zones and classified land use methods. The results obtained on the basis of phenological observations carried out in 2017 in Wrocław confirmed the extension of the period of vegetation in the city center in relation to its peripheries. Trees growing in road lanes entered the vegetation period later and defoliated faster, which confirms the negative impact of street conditions on the development of trees in urban space. Thus, the growing season in road lanes is shorter and due to the 1-year observation period, it is justified to conduct further observations.

scholarly journals Assessment of pedestrian mobility on road networks in the City Of Kigali

2020 ◽  
Vol 26 (2) ◽  
pp. 179-190
Author(s):  
David Nkurunziza ◽  
Rahman Tafahomi
Keyword(s):  
Road Networks ◽  
Traffic Signals ◽  
City Center ◽  
The Road ◽  
Bus Stop ◽  
Road Signs ◽  
Physically Challenged ◽  
Road Crossing ◽  
The City ◽  
Alternative Solutions

This paper analyzed and assessed the pedestrians’ mobility issues that are affecting their free movement and safety in the City of Kigali by outlining  the major challenges in the City and providing alternative solutions and measures for improving the mobility and safety of pedestrians. The  methodology of the paper was designed based on qualitative method with application of structured and unobtrusive. Referring to the paper  findings about the mobility challenges of pedestrians within the City of Kigali, it is noted that the mobility of the pedestrians and their safety is still  low and typical problems including road crossing viewed as the second challenges about pedestrians mobility, walking along very close to the road networks due to insufficient footpaths, lacking of enough road signs, lacking of information about pedestrian behavior on road networks, and  improper functioning of existing traffic signals as the first challenge. The paper found that the majority of road networks in the City of Kigali did not provide walkways, traffics signals designs and availability is very poor and some of them not functioning, zebra crossing facilities were not provided adequately, pedestrians shelter on bus stop are almost absent and ignored, vehicles travelling speed is still high and does not allow pedestrians to move freely, and the mobility of physically challenged people has been forgotten and there is a need of introducing the pedestrian overpass bridges in clouded zones of the city center, Nyabugogo, Kicukiro and Remera-Giporoso areas of the City of Kigali. Keywords: Mobility, Pedestrian Safety, Road Networks, Traffic Signals, Pedestrians.

scholarly journals A Smart Parking System Based on Mini PC Platform and Mobile Application for Parking Space Detection

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Vladimir Sobeslav ◽  
Josef Horalek
Keyword(s):  
Urban Areas ◽  
Mobile Application ◽  
Cost Effective ◽  
City Center ◽  
Parking Lot ◽  
Parking Space Detection ◽  
Car Park ◽  
Smart Parking ◽  
Pilot Implementation ◽  
The City

Car parking is a major problem in urban areas in developed and also in developing countries. The growing number of vehicles creates a problem with parking spaces mainly in the city center and the surrounding streets. The local authorities have to react with regulations, and the current situation is unpleasant for many citizens. Therefore, the aim of this article is to propose a complex outdoor smart parking lot system based on the mini PC platform with the pilot implementation, which would provide a solution for the aforementioned problem. Current outdoor car park management is dependent on human personnel keeping track of the available parking lots or a sensor-based system that monitors the availability of each car. The proposed solution utilizes a modern IoT approach and technologies such as mini PC platform, sensors, and IQRF. When compared to a specialized and expensive system, it is a solution that is cost-effective and has the potential in its expansion and integration with other IoT services.

scholarly journals Extracting Main Center Pattern from Road Networks Using Density-Based Clustering with Fuzzy Neighborhood

2019 ◽  
Vol 8 (5) ◽  
pp. 238 ◽  
Author(s):  
Xiaojie Cui ◽  
Jiayao Wang ◽  
Fang Wu ◽  
Jinghan Li ◽  
Xianyong Gong ◽  
...  
Keyword(s):  
Spatial Data ◽  
Spatial Clustering ◽  
Road Networks ◽  
City Center ◽  
The Road ◽  
Data Matching ◽  
Density Based Clustering ◽  
The City ◽  
Center Area ◽  
Main Center

The spatial pattern is a kind of typical structural knowledge that reflects the distribution characteristics of object groups. As an important semantic pattern of road networks, the city center is significant to urban analysis, cartographic generalization and spatial data matching. Previous studies mainly focus on the topological centrality calculation of road network graphs, and pay less attention to the delineation of main centers. Therefore, this study proposes an automatic recognition method of main center pattern in road networks. We firstly extract the main clusters from road nodes by improving the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) with fuzzy set theory. Moreover, the center area is generated with road meshes according to the area ratio with the covering discs of the main clusters. This proposed algorithm is applied to the road networks of a monocentric city and polycentric city respectively. The results show that our method is effective for identifying the main center pattern in the road networks. Furthermore, the contrast experiments demonstrate our method’s higher accuracy.

scholarly journals Future Housing Identities: Designing in Line with the Contemporary Sustainable Urban Lifestyle

Buildings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 18
Author(s):  
Ana Nikezić ◽  
Jelena Ristić Trajković ◽  
Aleksandra Milovanović
Keyword(s):  
Public Space ◽  
Urban Areas ◽  
Urban Regeneration ◽  
Urban Housing ◽  
Place Identity ◽  
Sustainable Urban Development ◽  
City Image ◽  
City Center ◽  
The Impact ◽  
The City

Over the past decade, urban housing typologies have evolved from being a feature of modern life to an essential postmodern issue, questioning future housing identities. One of the ways in which architecture can become engaged in this ever-changing process of urban regeneration is to challenge the inherited traditional housing typologies with the newly recognized values of contemporary lifestyle. This paper presents research and design aimed at exploring contemporary sustainable urban lifestyles as a resource for positioning housing structures as cultural urban infrastructure. The main focus of this study is design principles and strategies for generating future housing identities in accordance with sustainable urban development and sustainability of life in urban areas. It is about finding housing conceptual models for an interaction between housing and identity as a response to the impact of increased cities, changed lifestyles in contemporary cities and the requirements for the preservation of the city image and the public space within the housing areas in the city center. The main goal of this study is to understand whether and how an architectural design can preserve a sustainability of life within the city center and become a valuable agent of place identity in the process of urban regeneration. The paper indicates that the contemporary development of society requires a new architectural paradigm, in which lifestyle and architecture create a unique elastic open-ended system with the ability to adapt and change over time and throughout the place.

scholarly journals Da Esperança ao Triunfo: o estudo da formação de uma nova classe trabalhadora de Goiânia (GO)

2018 ◽  
Vol 11 (3) ◽  
pp. 193
Author(s):  
Renatha Cândida da Cruz ◽  
João Batista de Deus
Keyword(s):  
Middle Class ◽  
Working Class ◽  
Urban Areas ◽  
Economic Change ◽  
Urban Land ◽  
City Center ◽  
New Middle Class ◽  
Northwest Region ◽  
The City

Resumo:O objetivo principal deste artigo é tratar do processo de formação da Região Noroeste de Goiânia. Para tanto, realizou-se um amplo levantamento bibliográfico acerca das ocupações urbanas na capital goiana e  elaborou-se uma periodização sobre a ampliação do espaço urbano a noroeste do centro da cidade. Os resultados obtidos permitiram verificar como uma comunidade deixa de ser um grande bolsão de pobreza para ser considerada uma representação da nova classe trabalhadora de Goiânia. A temática torna-se pertinente, visto que os bairros da Região Noroeste têm origem em sucessivas lutas coletivas pelo solo urbano e passam por um longo processo de mudanças sociais e econômicas. O aumento da renda ganha destaque nos estudos sobre a localidade, em que se debate se há uma nova classe média ou uma nova classe trabalhadora.Palavras-chave: Nova classe trabalhadora. Goiânia. Ocupações urbanas. Abstract:The main purpose of this article is figure out the process of formation in the Northwest Region  of Goiania. To achieve this goal it conducted a comprehensive literature about the urban occupations in Goiânia and the development of a timeline on the expansion of urban areas to the northwest of the city center. The results of this research allowed us to understand as a community stops being a large slum to be considered a representation of the new working class of Goiania. The theme  becomes relevant in sense that neighborhoods of the Northwest Region originates in successive collective struggle for urban land and go through a long process of social and economic change and how the increase in income is an important factor in studies about this place and being perceived the discussion  above  new middle class or new working classKeywords: New Workin Class, Goiânia, Urban Occupations. Resumen:El principal objetivo de ese artículo es la comprensión del proceso de formación de la Región Noroeste de Goiânia. Para alcanzar esa meta se ha realizado un amplio levantamiento bibliográfico sobre las ocupaciones urbanas en la capital goiana así como la elaboración de una periodización acerca de la ampliación del espacio urbano al noroeste del centro de la ciudad. Los resultados obtenidos por esta investigación permitieron comprender como una comunidad deja de ser parte de un gran cinturón de pobreza para pasar a ser considerada una representación de la nueva clase trabajadora de Goiânia. La temática se vuelve pertinente puesto que los barrios de la Región Noroeste tienen origen en sucesivas luchas colectivas por el suelo urbano y pasan por un largo proceso de cambios sociales y económicos haciendo con que el incremento de la renta sea un factor relevante en los estudios sobre la localidad, percibiéndose el debate sobre una nueva clase media o nueva clase trabajadora.Palabras clave: Nueva clase trabajadora. Goiânia. Ocupaciones urbanas. 

scholarly journals Designing Mix-Use Waterfront in Kampung Badur

2018 ◽  
Vol 2 (2) ◽  
pp. 148-156
Author(s):  
Dwira Nirfalini Aulia ◽  
Regina Novita
Keyword(s):  
Population Growth ◽  
Urban Areas ◽  
Open Space ◽  
Spatial Arrangement ◽  
City Center ◽  
Lower Middle Class ◽  
Public Facilities ◽  
The People ◽  
The City

Currently, the population growth is growing very rapidly resulting in rapid growth of the needs of settlements. The population growth that is not proportional to the availability of land and the income level of the lower middle class  resulted in the emergence of illegal settlements and slums and are on land that is inconsistent with the city spatial plan for example on the edge of the river. This condition causes the decreasing quality of life of the people, especially in urban areas, destroying the environment and the spatial arrangement of the city. Medan city is one of the cities that there are many slums. One of the slums in the city of Medan is Kampung Badur located in Hamdan Village Medan Maimun District. The condition of the slums and the low economic level and the location of Kampung Badur located in the city center became the main problem in this area. Therefore, a solution is needed to solve problems in the area by making Kampung Badur an area that provides decent occupancy for occupancy and facilities that could be enjoyed together. The solution to this problem is to re-arrange Kampung Badur and develop potentials in the area. For example, Kampung Badur area which is right on the edge of the river becomes a potential in the design. So that the solution that can be applied is to develop Kampung Badur into Mix-Use Waterfront with a mix-use concept such as residential, public facilities and public open space to be enjoyed by residents Kampung Badur itself and by the people of Medan City.

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