Abstract
The extensive layout of roadside green spaces make them important green disaster mitigation nodes in high-density areas of any city; hence, further improvements in their disaster mitigation functions would make the urban disaster prevention system more effective. In the present research, different types of roadside green spaces in the Gulou district of Nanjing were identified to establish a highly efficient urban disaster refuge green space system. A total of 35 built-up roadside green spaces were employed as the study site, and for field investigation and statistical analysis, 21 factors were selected from the aspects of spatial form, functional facilities, and surrounding environment. According to their disaster mitigation abilities, cluster analysis classified these roadside green spaces into four categories: complete type, potential type, centralized type, and broad type. Finally, by analyzing the characteristics of different types of roadside green spaces, corresponding optimization strategies were proposed. In comparison to previous investigations, our study focused on the quantitative evaluation of disaster mitigation and risk protection function of roadside green spaces. In the future, the obtained results will serve as important scientific references to the planning and construction of green spaces in high-density areas of Nanjing, China.
Highlights
High-density urban areas manifest high population density and conspicuous infrastructural diversity
More than 70% roadside green spaces lacked toilets, water supply facilities, underground parking lots, and identification plates; more than 75% green spaces had less than 4 firefighting facilities; and 72% of green spaces had less than 19 lighting devices
In terms of spatial forms, 63% of roadside green spaces had a flat terrain with an average area of about 1 hectare, and pavement areas and lawn areas were ranged from 0.2~0.4 hectare
Summary
High-density urban areas manifest high population density and conspicuous infrastructural diversity. Urban green spaces play a key role in supporting activities of various social groups (Chen & Chang, 2015); such areas are generally considered to have high disaster risks; significant attention should be paid to the planning of a disaster mitigation system. Because of their functional characteristics, are ideal for shelter and evacuation during natural and man-made disasters. According to existing effective construction analysis, roadside green spaces should improve following three aspects of disaster mitigation and evacuation: 1. Publicize the functions of disaster mitigation and evacuation system to every resident in a city, 2. Make roadside green spaces more convenient to use for disaster evacuation. The following steps should be adopted to establish an effective disaster mitigation system: 1. Carry out systematic analysis and scientific evaluation of disaster mitigation abilities of roadside green spaces; 2. Put forward relevant suggestions for improvement, and 3. enhance the functions of disaster consequence mitigation
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