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definition - Multiple nuclei model

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Multiple nuclei model


The Multiple Nuclei Model is an ecological model created by Chauncy Harris and Edward Ullman in the 1945 article "The Nature of Cities".

  Multiple nuclei model


  The Model

The model describes the layout of a city. It says that even though a city may have began with a Central business district, or CBD, other smaller CBD's develop on the outskirts of the city near the more valuable housing areas to allow shorter commutes from the outskirts of the city. This creates nodes or nuclei in other parts of the city besides the CBD thus the name multiple nuclei model.

  1. Move away from concentric zone notion
  2. In largest city - have a structure which is essentially cellular and tend to develop a number of nuclei which serve as focal points for agglomerative tendencies, some more important than others.

  Effects of multiple nuclei on Industry

As multiple nuclei's develop transportation hubs such as airports are constructed, these transportation hubs allow industries to be constructed with cheap transportation costs. These Transportation Hubs can also create noise pollution and lower land values so land becomes cheap. Hotels are also constructed near airports because people who travel tend to want to stay closeby to the airport or source of travel. Housing develops in wedges and gets more expensive the farther from the CBD. (Swanson 360-364)

  Reasons the model

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 (e.g. heavy industry, business park, Retail Areas). The model is suitable for the big and expanding cities. The number of nuclei, around which the city expands, depends upon the situational as well as historical factors. Multiple nuclei develop because:

  1. Certain industrial activities require transportation facilities e.g. ports, railway stations etc to lower transportation costs.
  2. Certain activities tend to stay apart e.g. residencial zoning and airports etc.
  3. Certain activities are found together to their mutual advantage e.g. University, bookstore, coffee shops, Dhabas, etc.
  4. Certain activities requires the facility to be set in rare areas in a city like the CBD need very convenient traffic and factories need abundant source of water
  5. Certain events are benefited from the adjacent distance like the positions of factories and residence.
  6. Certain events are easily lead negative influences to others so these events should be avoid to exist at the same place, for example the graceful and wide greenbelt should not be arranged beside the steel factories which make a surge of smoke.
  7. Certain constructions have to be built at an unsuitable area because can’t afford the expensive cost , the warehouse was set at the border district of a city for example. Under the interaction of these four factors and the influence by the custom from history,the differentiation formed between different regions. But the individual maintained because the regions have their own center. That’s why the cities have lots of centers, so we can say city is not only made up by one center but multi-centers.

  Assumptions for Model

  1. Land is Flat
  2. Even Distribution of Resources
  3. Even Distribution of people in Residential areas
  4. Even Transportation Costs

(Swanson 360-364)

  See also

  References or Citations

Swanson, Kelly. Kaplan AP Human Geography. 2009. 2009. 360-364. eBook. <http://books.google.com/books?



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