Study on hierarchical location of urban emergency shelters(I)——hierarchy analysis

The feature of people's evacuation needs that are improved gradually along with the evacuation time going decides the hierarchy stucture of emergency shelters in location and spatial distribution.This paper firstly defines three types of hierarchical emergency shelters as temporary shelter,short-term shelter and long-term shelter.Based on the analysis of relation between evacution needs and hierarchy structure of emergency shelters,the paper reveals the characteristics of single-flow,nested services and spatial no-coherency in hierarchy stucture of emergency shelters.