镇域尺度的空间相互作用研究对促进城乡统筹和城镇体系规划具有重要意义。本文借鉴最新研究成果,从理论及实践层面对镇域空间相互作用研究进行了探索,提出一种基于空间可达性的辐射模型,并与传统重力模型进行比较分析。以大冶市16个乡镇为例进行实例研究,结果表明:1辐射模型与实测数据的相似度较高,可以更好地反映镇域空间相互作用的客观规律;2两种模拟方法在体现空间相互作用的方向性以及结构特征方面具有显著差异;3辐射模型中影响范围的引入以及空间可达性对区域异质性的体现是其与重力模型的主要区别。

From the spatial scale of township, the research on spatial interaction plays a key role in urban-rural integrated development and urban system planning. Spatial interaction models are techniques used by planners to understand and predict the location of activities and the movement of people, resources and information. The gravity model as classic and prevailing model one is based on Newton's gravity theory and utilizes the gravitational force concept as an analogy to explain the volume of trade, capital flows, and migration among the countries of the world. Given its parameter-free nature, the model requires as input only information on the population distribution when we analysis commuting and mobility fluxes. But the base of radiation model is ideal homo-geneous space ignoring that various flows between regions are not equally spread around places and this heterogeneity affects spatial configuration and interaction. Taking 16 towns in Daye county-level city as a case study, we obtain some important new findings as below:(1) we test the models against empirical data. (2) As for the direction of interaction, in each pair of towns, the influx intense to one region is difficult with its outflow in the radiation model while they are the same in the gravity model. (3) The spatial pattern of interaction reveals different characteristics from the result of these two methods.