scholarly journals The New Asian City: Three Dimensional Fictions of Space and Urban Form

2013 ◽  
Vol 31 (5) ◽  
pp. 1-3
Author(s):  
Hyun Bang Shin
Keyword(s):  
Urban Form ◽  
Three Dimensional

scholarly journals The Challenge of the Urban Compact Form: Three-Dimensional Index Construction and Urban Land Surface Temperature Impacts

2021 ◽  
Vol 13 (6) ◽  
pp. 1067
Author(s):  
Han Yan ◽  
Kai Wang ◽  
Tao Lin ◽  
Guoqin Zhang ◽  
Caige Sun ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Urban Form ◽  
Three Dimensional ◽  
Compact Form ◽  
Landsat 8 ◽  
Driving Mechanism ◽  
Building Density ◽  
Building Height

Cities are growing higher and denser, and understanding and constructing the compact city form is of great importance to optimize sustainable urbanization. The two-dimensional (2D) urban compact form has been widely studied by previous researchers, while the driving mechanism of three-dimensional (3D) compact morphology, which reflects the reality of the urban environment has seldom been developed. In this study, land surface temperature (LST) was retrieved by using the mono-window algorithm method based on Landsat 8 images of Xiamen in South China, which were acquired respectively on 14 April, 15 August, 2 October, and 21 December in 2017, and 11 March in 2018. We then aimed to explore the driving mechanism of the 3D compact form on the urban heat environment (UHE) based on our developed 3D Compactness Index (VCI) and remote sensing, as well as Geo-Detector techniques. The results show that the 3D compact form can positively effect UHE better than individual urban form construction elements, as can the combination of the 2D compact form with building height. Individually, building density had a greater effect on UHE than that of building height. At the same time, an integration of building density and height showed an enhanced inter-effect on UHE. Moreover, we explore the temporal and spatial UHE heterogeneity with regards to 3D compact form across different seasons. We also investigate the UHE impacts discrepancy caused by different 3D compactness categories. This shows that increasing the 3D compactness of an urban community from 0.016 to 0.323 would increase the heat accumulation, which was, in terms of satellite derived LST, by 1.35 °C, suggesting that higher compact forms strengthen UHE. This study highlights the challenge of the urban 3D compact form in respect of its UHE impact. The related evaluation in this study would help shed light on urban form optimization.

Arcology, Arcosanti and the Green Urbanism Vision

2016 ◽  
Vol 41 (4) ◽  
pp. 56-62
Author(s):  
Ruth A. Rae
Keyword(s):  
Urban Sprawl ◽  
Urban Form ◽  
Three Dimensional ◽  
Steering Committee ◽  
Natural Landscape ◽  
The Past ◽  
Green Urbanism ◽  
Pedestrian Transportation ◽  
The City ◽  
Central Arizona

Arcosanti is a prototype city being built based on the visionary architect Paolo Soleri’s principles of Arcology which integrates architecture with ecology. Arcology proposes a compact three-dimensional urban form to provide a lean alternative to the unsustainable urban sprawl city form found in most of America. In its reduction of dependence on the automobile, reliance on pedestrian transportation, proximity to nature and proposal to have agriculture integrated into the city, Arcology is a vision of Green Urbanism. The design of Arcosanti incorporates Biophilic principles that preserve the biodiverse natural landscape, has a compact organic form, and functions with a circular metabolism that is analogous to nature when complete. Arcosanti, located in central Arizona, was begun in 1970 as an urban laboratory, and has been constructed by over 7,000 workshop volunteers over the past 45 years. Following Soleri's death in 2013, the Cosanti Foundation has established a Strategic Planning Steering Committee to help guide the continued development of Arcosanti as a prototype Arcology. The Strategic Plan will provide a framework for future organization and development. This article examines how the concept of Arcology and the development of the Arcosanti prototype encompasses principles of Green Urbanism and sustainable development.

Evaluation of shortwave radiation fluxes in the multi-layer SPARTACUS-Urban scheme using DART

2021 ◽  
Author(s):  
Megan Stretton ◽  
William Morrison ◽  
Robin Hogan ◽  
Sue Grimmond
Keyword(s):  
Radiative Transfer ◽  
Urban Form ◽  
Climate Models ◽  
Weather Prediction ◽  
Computational Cost ◽  
Three Dimensional ◽  
Shortwave Radiation ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Urban Structure

<p>The heterogenous structure of cities impacts radiative exchanges (e.g. albedo and heat storage). Numerical weather prediction (NWP) models often characterise the urban structure with an infinite street canyon – but this does not capture the three-dimensional urban form. SPARTACUS-Urban (SU) - a fast, multi-layer radiative transfer model designed for NWP - is evaluated using the explicit Discrete Anisotropic Radiative Transfer (DART) model for shortwave fluxes across several model domains – from a regular array of cubes to real cities .</p><p>SU agrees with DART (errors < 5.5% for all variables) when the SU assumptions of building distribution are fulfilled (e.g. randomly distribution). For real-world areas with pitched roofs, SU underestimates the albedo (< 10%) and shortwave transmission to the surface (< 15%), and overestimates wall-plus-roof absorption (9-27%), with errors increasing with solar zenith angle. SU should be beneficial to weather and climate models, as it allows more realistic urban form (cf. most schemes) without large increases in computational cost.</p>

scholarly journals Extending the concept of the morphological frame: a case study of Tangshan old military airport

2017 ◽  
Author(s):  
Feng Song ◽  
Rongxi Peng ◽  
Zijiao Zhang ◽  
Yixi Li
Keyword(s):  
Urban Form ◽  
Three Dimensional ◽  
Urban Morphology ◽  
Morphological Transformation ◽  
Ground Plan ◽  
Plan Analysis ◽  
Peking University ◽  
Social Use ◽  
The Impact

Extending the concept of the morphological frame: a case study of Tangshan old military airport Rongxi Peng, Zijiao Zhang, Yixi Li, Feng Song* College of Urban and Environmental Sciences, Peking University. 100871 Beijing E-mail: [email protected], [email protected], [email protected], [email protected]*(corresponding author)Telephone Number: +86 132-6990-0350, +86 139-1013-6101* Keywords: China, morphological frame, three-dimensional view, airport Conference topics and scale: Urban form and social use of space/ City transformations/ Stages in territorial configuration   The concept of the morphological frame is important in urban morphology, but it has been discussed much less than other critical concepts, such as the fringe belt and the fixation line.  Passing its features on as inherited outlines, the morphological frame contains not only the linear fixation line, but also ground plan and three-dimensional aspects.  In this research, the linear, ground plan, and three-dimensional morphological frame of Tangshan old military airport during the expansion of the city after the removal of the airport is identified.  The former boundary roads of the airport exert obvious influences on the division of plots.  The former arterial roads also function as a linear morphological frame.  In relation to the ground plan, property rights and plots containing important buildings have an impact on the consequent town plan.  The distinct feature of the morphological frame of the airport is its three-dimensional constraint, i.e. the vertical clearance requirement, which restricted the height of surrounding buildings.  The impact of this institutional limit can last a very long time owing to the high cost of demolishing the old surrounding buildings or adding extra storeys even if the limit ceased to exist with the removal of the airport.  Based on this case study, this paper refines and extends the connotation of the concept of the morphological frame and further discusses the relationship between function and form.   References Conzen, M. P. (2009) ‘How cities internalize their former urban fringes: a cross-cultural comparison’, Urban Morphology 13(1), 29. Conzen, M. R. G. (1969) Alnwick, Northumberland: a study in town-plan analysis (Institute of British Geographers, London). Lin, Y., De Meulder, B. and Wang, S. (2011) ‘From village to metropolis: a case of morphological transformation in Guangzhou, China’, Urban Morphology 15(1), 5-20. Whitehand, J. W. R. (2001) ‘British urban morphology: the Conzenion tradition’, Urban Morphology 5(2), 103-109. Whitehand, J. W. R., Conzen, M. P. and Gu, K. (2016) ‘Plan analysis of historical cities: a Sino-European comparison’, Urban Morphology 20(2), 139-158.

scholarly journals Planarity and Street Network Representation in Urban Form Analysis

2018 ◽  
Author(s):  
Geoff Boeing
Keyword(s):  
Real World ◽  
Travel Behavior ◽  
Urban Form ◽  
Design Patterns ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Two Dimensions ◽  
Street Network ◽  
Form Analysis ◽  
Street Networks

Models of street networks underlie research in urban travel behavior, accessibility, design patterns, and morphology. These models are commonly defined as planar, meaning they can be represented in two dimensions without any underpasses or overpasses. However, real-world urban street networks exist in three-dimensional space and frequently feature grade separation such as bridges and tunnels: planar simplifications can be useful but they also impact the results of real-world street network analysis. This study measures the nonplanarity of drivable and walkable street networks in the centers of 50 cities worldwide, then examines the variation of nonplanarity across a single city. It develops two new indicators - the Spatial Planarity Ratio and the Edge Length Ratio - to measure planarity and describe infrastructure and urbanization. While some street networks are approximately planar, we empirically quantify how planar models can inconsistently but drastically misrepresent intersection density, street lengths, routing, and connectivity.

The Topological City

2011 ◽  
Vol 374-377 ◽  
pp. 1985-2000
Author(s):  
Simon Kringas
Keyword(s):  
Urban Form ◽  
Three Dimensional ◽  
Agricultural Landscapes ◽  
Urban Life ◽  
Natural Systems ◽  
High Rise ◽  
Modern Cities ◽  
Dimensional Network ◽  
Mixed Use ◽  
Alternate Configuration

The Topological City is a design concept for a three-dimensional city in China. To accommodate future populations, cities need to be dense, diverse and ecological. Minimising the physical dimension reduces the consumption of material and energy and the destruction of ecological and agricultural landscapes. Mixed-use cities reduce the time, energy and congestion of travel. The integration of natural systems improves environmental quality and supports biodiversity. Ultimately however, the quality and functionality of contemporary urban life relies on dynamics of economic, social and intellectual interaction. The design form of a city must facilitate exchange between heterogeneous and changing programs while minimising energy and maximising habitat. High-rise construction is the dominant morphology of modern cities. Generated by an extrusion from the ground toward the sky, high-rise adds significant density but results in circulatory dead ends, structural inefficiency and habitat disconnectedness. High-rise is not interactive, energy efficient, or ecological. The Topological City proposes an alternate configuration of the urban environment. Drawing on the theory of place and connection known as ‘topology’, it constructs a three-dimensional network of vertical and horizontal towers, connected and activated by circulation. The Topological City is dense, diverse, ecological and interactive, suggesting a potential new direction for sustainable urban form.

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