On The Changing Process of Urban Spatial Structure and Improvement Problems of Central Cities in Hokkaido

本研究旨在分析后高速增长时期北海道中心城市的城市化与城市区域转型趋势。并运用城市土地利用规划理论，对省级中心城市的完善体系进行了研究，取得的一些成果如下：1.将人口密集的北海道城市的变化特征划分为加速阶段、扩展阶段和下沉阶段。2.在“建成区”中，有处于稳定状态的“人口稳定区”和“更新区”。在“欠城市化地区”，有两种类型的城市化过程：“填充型空置空间”和“更新型建成空间”。因此，有必要根据区域和城市的规模，以及城市基础设施和整个城市空间的运动，建立“创造运动的方法”和“骑乘运动的方法”等结构改进系统的实现方法。3.描述了稳定区域的两种不同类型的情况：环境状况良好，需要维护和保护的环境，以及未来需要公共投资的区域。强调了制定稳定环境规划和制定改善方法的重要性，并介绍了该方案。

The aim of this research is to analyze the trend of urbanization and transformation of urban area in central cities in Hokkaido in post-high growth period. In addition, a study is made utilizing planning theory for Urban Land Use, and for Improvement System of provincial central cities.Some of the results obtained are follows;1.The characteristics of the changes that have occurred in the cities in Hokkaido whose compact and densely populated urban areas have been broken down, will be arranged by division into the following three stages: Quickening stage; Expanding stage; and Subsiding stage.2.In "built-up area", there are "population stable areas" which is in a stble state and "renewal-advancing areas". In "under-urbanized areas", there are two types of urbanizing processes; "the type filling-up their vacant spaces" and "the type renewing built-up spaces". So,it's necessary to establish the method of realizing a structual improvement system, such as "a method of creating movement" and "a method of riding on the movement", based on the scale of an area and a city, and the urban infrastructure and the movement of the whole urban space.3.Two different types of situations in stable areas are described:environments in good condition which should be maintaind and preserved, and the districts which need future public investment. The importance of making a plan for stabilizing the environment and establishing the method of improvement as well as intruducing the plan is emphasized.