Evaluation and Optimization of Refuge Green Space in the Central Area of Tianjin for Geological Disasters

Refuge Green Space (RGS) plays roles in both rapid evacuation and short-term resettlement response to sudden natural hazards, especially geological disasters. As a result, its evaluation location optimization are crucial for the development of sustainable cities. In this study, Three-Step Floating Catchment Area Method (3SFCA) Moran’s I index were used as measurement models. The capacity RGS evaluated by calculating accessibility with 5, 10, 15 30 min walking. purpose study was quantitatively evaluate supply central area Tianjin provide recommendations future additions RGS. results show that over 80% research exhibited relatively poor service within 5–10 walking distance, while less than 20% good capacity. Within 15–30 approximately 60% not well served RGS, 40% served. conclusion, layout exhibits unevenness polarization phenomena, different categories varies widely. There is an insufficient Emergency Sheltered Temporary Space, which available difficult reach min. coverage Disaster Prevention Park good, essentially covering entire distance; however, average. Based on these conclusions, areas weak identified, potential identified conjunction System Plan.