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River valley urban network and morphology: A study on the urban morphology evolution of Lanzhou

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  • Minan Yang
  • Yongsheng Qian
  • Xin Li
  • Yueqing Ou
  • Junwei Zeng

Abstract

The present study investigates the dynamic evolution characteristics of urban spatial morphology by analyzing real road network data from 2000, 2010, and 2020, along with nighttime lighting data employing spatial analysis methods and spatial syntax models. Accordingly, two separate dimensions of urban morphology: internal and external, are covered. First, the integration and synergy of interior morphology features are analyzed using spatial syntactic modeling. Subsequently, the spatial compactness, fractal dimension, and level of center of gravity shift of the city are assessed by combining the nighttime lighting data with the earlier dataset. This analysis facilitated the deep exploration of the spatiotemporal evolution of the city’s external morphology. Building upon this foundation, the interaction between the "internal and external" domains was analyzed further. The main findings of the study reveal a synchronous pattern of urban expansion throughout the evolution of urban spatial morphology. Furthermore, the urban form was observed to undergo a progressive transformation, transitioning from a "single core" morphology to a "primary and secondary double core" morphology. Over time, this development progressed and evolved into a "belt-like multi-core" structure. Additionally, the coupling characteristics further validate the relationship between the structure of the road network and the urban morphology in river valley-type cities. In particular, accessibility of dense and horizontally distributed transportation network was found to significantly influence the spatial development of these cities. As observed, the findings provides valuable insights into understanding the characteristics of internal and external associations regarding urban spatial patterns.

Suggested Citation

  • Minan Yang & Yongsheng Qian & Xin Li & Yueqing Ou & Junwei Zeng, 2024. "River valley urban network and morphology: A study on the urban morphology evolution of Lanzhou," PLOS ONE, Public Library of Science, vol. 19(5), pages 1-20, May.
    • Handle: RePEc:plo:pone00:0302686
    DOI: 10.1371/journal.pone.0302686
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    References listed on IDEAS

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    2. Feng, Rundong & Wang, Kaiyong, 2022. "The direct and lag effects of administrative division adjustment on urban expansion patterns in Chinese mega-urban agglomerations," Land Use Policy, Elsevier, vol. 112(C).
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