一种优化的交通网络及其在实践中的应用

An Optimum Communication Networks and Its Application

增长三角是协调城市体系功能、加速区域发展的有效方式。根据中点优先极化的原理和重心极化原理,容易推出两种具有分形特征的三角网络:中点极化网和重心极化网。引入分枝维的概念,对两种分形网络进行维数计算;认为中点极化网既有增长三角的优势又有优化的分形维数,是较为理想的城市体系交通网络配置。基于这种认识,以河南省中心城市群为例,计算出该区的交通网络分维数为1.4375,根据与中点极化网分维数的差距和该网络现有问题,规划了理想的交通网络模式。

Growth triangle has been proved to be an effective developmental pattern in optimizing total structure of a region and in regulating eco-tech cooperation among different regions as well. So it is easy to yield, by the principles of mid-point primate polarization and center of gravity primate polarization, two triangle networks with fractal geometry nature, i. e. mid-point polarization networks and centre of gravity polarization networks. After introducing concept of dendrite dimension, this paper determined their dendrite dimension as 1. 585 and 1. 339 respectively, concluding that the mid-point polarization networks uphold both growth angle advantages and optimal fractal dimension, being an ideal transportation of urban systems. Upon this view, the paper discussed the deep meaning of dendrite dimensions with an example of core urban agglomeration of Henan （CUAH） province,as well as determining the dendrite dimension of CUAH to be 1. 4375. Then the paper plans the ideal transportation pattern on the basis of the present limitation of networks of CUAH and requirement for mid-point networks. Finally, some optimum arguments are discussed.