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Multiple Nuclei Model in Urban and Regional Planning

By: Haseeb Jamal / On: Dec 23, 2017
Multiple Nuclei Model
  • The multiple nuclei model is an economical model created by Harris and Edward Ullman in 1945
  • This model describes the layout of a city, it is based off of Chicago
  • Modern cities more complex than suggested by other theorists
  • Each nucleus acts as a growth point
  • Growth occurs outwards from each nucleus, until they all merge into one large urban area
  • It says even though a city may have begun with a CBD, it will have other smaller CBDs develop on the outskirts of the city
  • If other CBDs develop on the outskirts of a city they would be around valuable housing areas to allow shorter commutes to the outskirts of the city

Reason for the Model

  • Harris and Ullman argued that cities don't grow a single nucleus but several separate nuclei
  • Each nucleus acts like a growth point
  • The theory was formed based on the idea that people have greater movement due to increased car ownership
  • This increase of movement allows for the specialization of regional centers
  • The number of nuclei around which the city expands depends upon situational as well as historical factors Reasons for the Model Continued

Effects on Industry

  • As multiple nuclei develop, certain types of transportations like airports are created
  • Those allow industries to be established with a reduction in transportation cost
  • These transportation hubs have negative effects
  • Some effects are noise pollution and lower land values
  • Hotels are also built around airports because people who travel want to be near their source of transportation

Placement of Classes

  • Low Class: Low class residential area are closer to the manufacturing jobs which tend to be non-minimal skilled jobs. They also tend to have low wages which in turn lead to a low-class resident
  • Medium Class: Medium class residential area tends to be close to the CBD. It also has more space to spread out to support the population which are doing the skilled-labor jobs
  • High Class: High class residential areas tend to be on the outskirts of the medium class residential area. The area is also touching the outlying business district. The jobs that the people in this district do are usually skilled labor and have high incomes.

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