瞭解及闡釋新高中地理課程.pps
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1、Chauncy Harris and Edward Ullman,Multiple Nuclei Model,2,Basic assumptions,More complex urban structures than Burgess and Hoyts modelsSeveral independent nucleiEach nucleus = a growth point and has function different from other nuclei,3,London,4,Westminster: administration,DocklandIndustrial,West En
2、dShopping, entertainment,Basic assumptions,Outward growth of each nucleusThen they merge as one large urban centreBarnet and Croydon were towns around London and now become part of greater London.,5,Basic assumptions,If the city becomes too large and congested, some functions may be dispersed to new
3、 nuclei.Dockland industrial decline paves way for the new industries set up near Heathrow Airport, along M25 and M4.,6,7,Why did Harris & Ullman put forward the model?,Pattern of urban land use does not develop around a single center but around a no. of discrete nuclei.Some cities have taken up surr
4、ounding settlements or have developed strong suburban areas around the periphery of the city.As the city grows larger, the traditional CBD is no longer sufficient to serve the commercial needs.As a result, additional nodes emerge in outlying districts such as new suburban shopping center, industrial
5、 suburb.,8,Main features of the model,Polycentric / multiple-centredThe model abandoned the CBD as the sole focal point, i.e. suggest alternatively that the zones will develop around a number of quite separate discrete nuclei in addition to the CBD. The number of nuclei depend on the size of the cit
6、y, i.e. the larger the city, the more numerous and specialized the nuclei are.The city will develop in a cellular structure in which distinctive forms of land use have developed around certain nuclei within the urban area.,Los Angeles,9,Well-established highways,10,Transport junctions,11,12,Why mult
7、i-nuclei?,Different activities have different specific location requirements. Certain specialised functions can only operate where particular facilities are available. e.g. a CBD locates at the point of maximum accessibility.e.g. large industries need cheap land.e.g. high-class housing is drawn to h
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