关键词: 城市用地, 时空特征, 群组型港口城市, 形态演变, 宁波

Abstract:

Ningbo, classic group city, is the central city of the south Yangtze River Delta and is one of the economically developed coastal areas. Since the late 1970s, its urbanization process has been quickened greatly, which resulted in substantial increase in both urban areas and urbanization intensity. The landsat MSS, TM/ETM satellite images, which were respectively acquired in five periods of 1979, 1990,1995,2000 and 2005, were used to extract urban land information and analyze urban growth data with the help of remote sensing and GIS software. We analyzed the spatio-temporal characteristics including urban growth speed, growth intensity and fractal dimension. Additionally, outer spatial form of urban expansion in Ningbo city was also analyzed. The results are as follows. (1) From 1979 to 2005, the growth speed and the growth intensities of urbanized area in Ningbo city were accelerating obviously. To the three districts, there are some differences in the growth speeds and intensities. (2) The fractal dimensions of urbanized land structure were fluctuant and relating to the growth process of urbanized land. When the shape of urbanized land tends to be regular, the fractal dimension will decrease. (3) The mode position of index of the growth intensities related to shape centre of the urbanized land tends moving toward the outside. But the change of the mode value differs from each other in the three districts. (4) The direction of spatial expansion of urbanized land was obviously related to transplanting of port and the development of port economy. (5) With the transplanting of Ningbo port from river port, estuary port to coastal port, the evolvement of outer spatial form of Ningbo city was from the type of single central city with river port, enclave group city of estuary port with "one city and one town", enclave group city of coastal port with "one city and two towns" and discontinuity zonal city of coastal port with "one city and many towns". Finally, the "T-shaped" outer spatial form of modern Ningbo city composed of towns along the coast and towns along the Yong jiang River will come into being.

Key words: urbanized land, spatio-temporal characteristic, group port city, spatial form evolution, Ningbo