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Ullman and Harris 1945

Urban growth population model

Natasha Bowyer

on 21 July 2011

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Transcript of Ullman and Harris 1945

Characteristics of urban
growth in MEDCs Multiple Nuclei Model The model describes
the layout of the city,
whilst a city may have started
with a Central Business District
(CBD), comparable industries with
similar financial requirements and
common land use are established
near each other. These are
influenced by their immediate
surroundings. For example around
airports hotels and
restaurants pop up. The basis of the
theory was the idea
that due to increased
car ownership people
have greater mobility.
The increase of
movement allowed for
the specialisation
of the different
nodes. CITIES
NODES Differential accessibility.
Various activities require specialized facilities such as port and rail terminals

Land use and Compatibility.
Similar activities group together. This may be defined as centripetal forces

Land use and incompatibility.
Some activities repel others, for example; high quality residential and heavy industrial. This may be considered a centrifugal force.

Local Suitability.
Some activities may not be in a position where they can afford the rent for an optimal location. These nodes become
specialised and
differentiated based
on a number of traits: Ullman and Harris
1945 The model still had a CBD,
but there are other specific
functions which are carried
out by other centres.
Hoyt and Burgess now believe
these nodes, which carry out
other functions, are found
around the CBD. In London, areas such as
the City, Westminster,
Oxford Street and the
West End all have their
own specific functions... Some cities do display
the characteristics of
the multi nuclei model. This shows the Multi Nuclei model in a visual format...

...The small CBD is visible at A in the centre of the diagram and it is surrounded by other nodes. For example the various colours display thing such as industrial, buisness and residential areas. proper hello :) Within greater London
there are smaller CBDs
which have been created
as London has engulfed
other towns and villages.

Cities such as London do
not grow from one CBD,
they grow from these
smaller seperate CBDs Multiple nuclei model is more complex than some other models in terms of land use zones (for example industrial suburbs)
Multiple nuclei allows: suburbanisation, transport development and outward growth of city.

It only gives the idea of land use pattern of a city. Criticisms:
it does not take into account the height of the buildings

there’s not clear divisions between the different zones

the zones display a degree of internal heterogeneity and not homogeneity

physical relief is not taken into account

government policy is not taken into account

model may not be applicable to cities of different cultural, economic and political backgrounds. CRITISISMS
STRENGTHS The advantages of this model are mostly related to its multinuclear approach-
Many sources give variants of the model as it is rather flexible and so adapts to local situations (the exact positions of the nuclei are not important but only the basic trends) therefore it can be modified to fit the regarded city.
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