1930s和1960s珠江三角洲城镇建成区位序-规模、扩展及其形态特征

RANK-SIZE,EXPANSION AND FORM CHARACTERISTICS OF URBAN BUILT-UP AREAS IN PEARL RIVER DELTA DURING 1930s AND 1960s

基于1930s、1960s的1∶5万地形图的解译,借助GIS软件,计算了1930s和1960s珠江三角洲地区15个城镇建成区面积、位序-规模、紧凑度与圆形率,并对该时段内建成区扩展强度及其形态特征进行了分析.1930s与1960s位序-规模分别呈Y=11.48X-1.30、Y=15.63X-1.28,城镇体系具有相似的特征,呈现金字塔的城镇规模结构;建成区规模小,扩展速度低,约0.98 km2/10 a;建成区的扩张主要表现为四周扩展和主轴线扩展;形态紧凑性差,呈现分散化态势.依据城镇发育的条件与形态特征,将城镇形态分为低山丘陵主导型、河网主导型、平原主导型3种.

Based on the 1：50 000 Topography map of 1930s and 1960s and supported by GIS, the area, rank- size, compact ratio and circularity ratio of 15 built - up areas in the Pearl River Delta are calculated, and the growth intensity and form characteristics during 1930s and 1960s are analyzed. The rank - size distribution of 1930s and 1960s was Y = 11.48X-1.30 and Y = 15.63X-1.28 respectively. The structure of urban system had the similar characteristics, presenting the ＂pyramid＂ structure. The built- up areas were small and the expansion speed was slow with 0. 98 km2/10 a. The growth pattern was mainly the expansion along the principal axis or around the built - up area. The form compact nature was weak, going to the decentralization tendency. According to the urban development conditions and form characteristics, the urban forms were divided into three types - low hill leading type, river network leading type and plain leading type.