Urban Morphology of the City of Tshwane
Transcript of Urban Morphology of the City of Tshwane
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Urban Morphology of the City of Tshwane
DARREN NEL & ALBERT FERREIRA WITH SERGE SALAT 01.08.2013
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Introduction
• Comparative typology analysis between various areas in the City of Tshwane and International Examples
Scale of analysis:
• 1600m X 1600m (1 square mile)
• 800m X 800m
• Block and Building interface
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Morphological Typology in the City of Tshwane
Case study areas
• Inner city of Pretoria Tshwane
– Grid model
– Fine grain grid
• Suburban – Classic Open
– Enclosed and Gated communities
• Township
– Informal
– “RDP”
• Rural
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Case study Areas
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1 square mile selection
Woodhill Brooklyn
CDB Zambezi Irene
Attridgeville Hammanskraal
Mamelodi
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Ahmedabad: 2700 intersections Hammanskraal
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Ahmedabad: 2700 intersections Mamelodi
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Marabastad
40m
70m
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240m
140m
Pretoria Central
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CBD of Tshwane New York
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CBD of Tshwane San Francisco: 137 intersections
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CBD of Tshwane Barcelona: 168 intersections
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CBD of Tshwane Brooklyn
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CBD of Tshwane
Marabastad
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Walnut Creek: 107 intersections Zambezi Country Estate
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Paris Attridgeville
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Walnut Creek: 107 intersections Woodhill estate
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Inner city Blocks
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Key scales for urban sustainability
City scale
• Compact
• Connected
Community scale
• Walkable
• Accessible
Block scale
• Mixed use
• Diversified
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800mX800m area
22
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The Contrast between interface and use
Informal Trader Mobile Street Trader Chain Store/National Retailer Convenience Store Wholesale Arcade/Shopping centre route Individual Shop Speciality Retail
LEGEND 24
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Small Blocks with subdivisions and mixed uses
Informal Trader Mobile Street Trader Chain Store/National Retailer Convenience Store Wholesale Arcade/Shopping centre route Individual Shop Speciality Retail
LEGEND 25
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Grid Resilience & Subdivisions
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1939
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1958
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1976
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1991
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2013
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Menlyn Maine Attridgeville CBD Brooklyn Zambezi Estate
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Neighbourhood Analysis
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Selected study areas
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Brooklyn
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Brooklyn: unit of analysis (800 x 800 m blocks)
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Does not lend itself to large enclosures
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Irene
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Irene: unit of analysis (800 x 800 m blocks)
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Newlands
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Case 2: Newlands (enclosed area)
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Newlands: Unit of analysis (800 x 800m block)
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Most of Pretoria east: suburban layout
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The evolution of the suburban tree
Salat (2012)
A B C D
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Silver Lakes
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Silver Lakes: unit of analysis (800 x 800 m block)
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The evolution of the suburban tree
Indicator What is being
calculated Brooklyn Irene Silver Lakes Newlands
Intensity Surface occupied by road
network (%) 9.1 15.4 24.8 37.5
Connectivity
Connectivity of the car
grid 31.6 28.1 12.5 28.1
Cyclomatic complexity of
the car grid (per 0.64
km²)
25 26 11 14
Average distance
between intersections
car grid (m)
150 152 224 147
External Connectivity
(How easy is it to get
outside of the area)
34 2 2 3
Proximity
The mean distance
between two
destinations (nearest
major shopping centre –
straight line distance)
Less than 1 km Less than 1 km Between 1 and 2 km Less than 1 km
Diversity
The number of different
uses More than 6 More than 6 2 1
Number of road
hierarchies 2 1 1 2
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The evolution of the suburban tree
Salat (2012)
A B C D
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The evolution of the suburban tree
Adapted from Salat (2012)
A B C D E
Should it be considered as a new type of urban morphology or just the ultimate manifestation of suburbia?
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The evolution of the suburban tree
Evolution of modernistic planning In Tshwane
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Gated communities: concentrated
Gated off areas take up ±2.3% of the area of the City of Tshwane
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Selected area of concentration
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Concentration of different types