黄山市乡村聚落网络结构特征

以黄山市2014年卫星影像为数据源,将乡村聚落矢量数据和分乡镇行政区划矢量数据进行叠置分析,并统计每个乡镇乡村聚落的面积.在改进引力模型的基础之上,借助社会网络分析方法,以聚落面积和各聚落之间的距离为变量构建黄山市乡村聚落空间网络结构模型,实证分析了黄山市乡村聚落网络结构特征.研究结果表明:(1)从网络节点结构分析来看,网络内向程度中心性和外向程度中心性都存在明显的两级分化现象;整个网络中介中心性分布极为不均衡,区县节点在整个网络中扮演着枢纽的作用,而乡镇节点的桥梁作用远逊于区县节点;通过对网络节点的结构洞指标进行对比分析发现,城市聚落的节点具有显著的结构洞优势,而乡镇节点的结构洞优势相对较弱.(2)从整体网络结构分析来看,黄山市乡村聚落空间网络密度较低,乡村聚落之间的相互影响较小;从程度中心势的指标来看,不论是内向程度中心势指标还是外向程度中心势指标,其数值都较高,说明乡村聚落空间网络结构具有明显的集中趋势;乡村聚落空间网络结构存在明显的核心-边缘结构特征,核心区节点之间比边缘区节点之间空间互动关系更为密切,但总体来讲这种空间作用仍然较小.

Analysis of the Characteristics of Rural Settlement Network Structures in Huang Shan

Based on the satellite image of Huangshan City,an overlay analysis method was used between the vector data of rural settlement and administrative division to calculate the area of rural settlement in each town.Based on modified gravitation model and using social network analysis,this paper constructs an rural settlement space network structure model which takes settlement area and distance between settlements as the variable.Then,this paper empirically studies the characteristics of rural settlement network structure in Huangshan.Some conclusions are draw as follows:(1)From the point of view of network node structure analysis,there were two levels of differentiation in the center of the degree of inward and outward;the entire network intermediary centricity distribution is extremely uneven,district node plays a pivotal role in the entire network while the town node is far inferior to it;we come to the conclusion that urban settlement node has significant structural hole edge,but the towns node structure hole edge is relatively weak,by comparing the structure of the network node hole index analysis.(2) From the point of view of the whole network structure analysis,the density of rural settlement space is relatively low,and the mutual influence of rural settlement is small;the value of the degree of inward and outward degree of central potential are higher,it shows that the network structure of the rural settlement space has obvious concentration trend;the network structure of the settlement space has obvious Coreperiphery structure feature,the spatial interaction between nodes in the core area is closer than that between the edge nodes.But generally speaking,this kind of space interaction is still small.