The multiple nuclei model describes the layout of modern complex cities. It proposes that cities do not grow from a single central business district (CBD) but from multiple smaller CBDs that act as growth points. Each nucleus expands outward until they merge into a single large urban area. As additional CBDs form on the outskirts, valuable housing develops nearby to allow shorter commutes. This model was created in 1945 based on the observation that increasing car ownership enabled greater movement and specialization across regional centers.

1. MULTIPLE NUCLEI
MODEL IN URBAN AND
REGIONAL PLANNING
PREPARED BY
GAYATHRY SATHEESAN

2. multiple nuclei model
• It 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.

4. 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

5. 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

6. 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.

7. Thank you…