scholarly journals Analysis of Road Network Pattern Considering Population Distribution and Central Business District

PLoS ONE ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. e0151676 ◽  
Author(s):  
Fangxia Zhao ◽  
Huijun Sun ◽  
Jianjun Wu ◽  
Ziyou Gao ◽  
Ronghui Liu
2018 ◽  
Vol 7 (3.25) ◽  
pp. 54
Author(s):  
Muhammad Muktar ◽  
Abdulaziz S. Ahmed

There have been major concerns in the planning of both public and private spaces in Kano central area. Consequently, the entire urban fabric have been restructured due to uncontrolled developmental growth, population density, high cost of land value, unavailability of business location and poor accessibility to road network. These situations have brought about a physical and social shift in the position of Kano Central Business District (CBD) area, of which not prevented will continue to cause major urban cohesion and sustainability issue. Thus, this paper took a preemptive step to evaluate the existing problems and identify the major sustainability issues and where urban cohesion failed. A qualitative method was employed that does not only consider the study of morphological factors of the public space network in Kano CBD, but also the social, environmental and economic dynamics they generate. Thus, the data were collected through fieldwork (favoring direct contact with the territory), and analyzed using four key dimensions namely ‘Form and legibility’, ‘Access and Connections’, ‘Uses and Activities’, then ‘Sociability and Identification’. The findings revealed that the neighborhoods that make up the CBD have lot of abandoned buildings, insufficient access routes, poor drainage system, high volume of traffic that cause lot of pollution and proliferation of solid waste that makes road network impermeable, and an aesthetic eyesore. In view of these, the study recommends a set of urban intervention strategy capable of guiding the planning and redesign of public spaces in Kano CBD in order to promote urban cohesion and a sustainable environment. 


2011 ◽  
Vol 219-220 ◽  
pp. 13-17
Author(s):  
Jin Xing Shen ◽  
Chang Jiang Zheng

Central business district (CBD) is the crucial area in modern metropolitan areas. In this study, an evaluation system is proposed to help transportation professionals determine the reasonable scale of road network in CBD. The evaluation system consists of two parts, including a indicator system and a selection system. The indicator system is based on the measurement of several parameters such as the regional road traffic capacity, smoothness of regional road network, unit road load, and regional road network structure, etc. The selection system uses the maximum entropy with the results of the indicator system to select the reasonable road network scale. A case study is also conducted to apply the whole evaluation system to Huaqiao central business district. The research results show that the evaluation system developed in this study can be used as a useful guidance for determining a reasonable road network scale for the city central business district in metropolitan areas in China.


2020 ◽  
Vol 12 (18) ◽  
pp. 7717 ◽  
Author(s):  
Hang Ren ◽  
Wei Guo ◽  
Zhenke Zhang ◽  
Leonard Musyoka Kisovi ◽  
Priyanko Das

The widespread informal settlements in Nairobi have interested many researchers and urban policymakers. Reasonable planning of urban density is the key to sustainable development. By using the spatial population data of 2000, 2010, and 2020, this study aims to explore the changes in population density and spatial patterns of informal settlements in Nairobi. The result of spatial correlation analysis shows that the informal settlements are the centers of population growth and agglomeration and are mostly distributed in the belts of 4 and 8 km from Nairobi’s central business district (CBD). A series of population density models in Nairobi were examined; it showed that the correlation between population density and distance to CBD was positive within a 4 km area, while for areas outside 8 km, they were negatively related. The factors determining population density distribution are also discussed. We argue that where people choose to settle is a decision process between the expected benefits and the cost of living; the informal settlements around the 4-km belt in Nairobi has become the choice for most poor people. This paper ends with suggestions for urban planning and upgrading informal settlements. The findings will increase our understanding of urban population distribution in underdeveloped countries.


2016 ◽  
Vol 55 (3) ◽  
pp. 723-741 ◽  
Author(s):  
Xiao-Ming Hu ◽  
Ming Xue ◽  
Petra M. Klein ◽  
Bradley G. Illston ◽  
Sheng Chen

AbstractMany studies have investigated urban heat island (UHI) intensity for cities around the world, which is normally quantified as the temperature difference between urban location(s) and rural location(s). A few open questions still remain regarding the UHI, such as the spatial distribution of UHI intensity, temporal (including diurnal and seasonal) variation of UHI intensity, and the UHI formation mechanism. A dense network of atmospheric monitoring sites, known as the Oklahoma City (OKC) Micronet (OKCNET), was deployed in 2008 across the OKC metropolitan area. This study analyzes data from OKCNET in 2009 and 2010 to investigate OKC UHI at a subcity spatial scale for the first time. The UHI intensity exhibited large spatial variations over OKC. During both daytime and nighttime, the strongest UHI intensity is mostly confined around the central business district where land surface roughness is the highest in the OKC metropolitan area. These results do not support the roughness warming theory to explain the air temperature UHI in OKC. The UHI intensity of OKC increased prominently around the early evening transition (EET) and stayed at a fairly constant level throughout the night. The physical processes during the EET play a critical role in determining the nocturnal UHI intensity. The near-surface rural temperature inversion strength was a good indicator for nocturnal UHI intensity. As a consequence of the relatively weak near-surface rural inversion, the strongest nocturnal UHI in OKC was less likely to occur in summer. Other meteorological factors (e.g., wind speed and cloud) can affect the stability/depth of the nighttime boundary layer and can thus modulate nocturnal UHI intensity.


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