当前关于活动空间的研究受限于绝对物理空间的概念化，未能考虑由人流动态在不同地点间空间互动所重构的关系空间的异质性，且未能充分纳入人类移动的内在层级特性。因此，这些方法无法真实反映人们通过出行与城市空间的互动方式。从关系空间的视角出发，本研究提出新的层级活动区域模型（Hierarchical Activity Region Model, HARM），以推导不同城市群体感知的活动空间及其层级属性。基于纽约市曼哈顿地区出租车数据，我们验证了该模型在桑迪飓风前后不同阶段出行行为中的增强有效性。实证结果表明，即使在重大天气事件干扰下，城市内部出行仍保持清晰的层级组织结构；然而，出行呈现出层级压缩效应，表现为层级数量减少、特征尺度扩大，随后出现反弹。对推导出的层级结构进行聚类分析揭示了显著的异质性，源于人口特征差异：部分群体维持更深层次结构或快速恢复，而另一些群体则经历层级持续丧失。本研究为理解城市移动的功能层级提供了重要洞见，有助于推动更具可持续性、韧性与公平性的城市规划。所提出的范式具有普适性，适用于更广泛情境下的人类移动研究。

Current studies on activity space are limited by the conceptualization of absolute physical space that fails to consider the heterogeneity of relational spaces reconstructed from spatial interactions of human movements between locations and falls short in incorporating the inherent hierarchical property of human mobility. Consequently, these approaches cannot faithfully reflect how people interact with urban spaces through travels. From the lens of relational space, this study proposes the new Hierarchical Activity Region Model (HARM) to derive the space and hierarchical properties of activity spaces perceived by various urban groups. We demonstrate the enhanced validity of our model on travel behavior in Manhattan, New York City, before, during, and after Hurricane Sandy on the basis of taxi data. Empirical results show that intra-urban travel retains clear hierarchical organization, even under disruption of a major weather event. Yet, travel undergoes a compression effect in travel hierarchies, characterized by fewer hierarchical levels and enlarged characteristic scales, followed by a rebound. Clustering the derived hierarchies reveals pronounced heterogeneity that stems from differences in population profiles; some groups sustain deeper structures or recover quickly, while others experience a persistent loss of levels. This study provides valuable insights into the functional hierarchies of urban mobility, which could inform more sustainable, resilient and equitable urban planning. The proposed methodological framework is generic for studying human mobility in broader contexts.