Wu et al. (2025) A Framework for Refined Hydrodynamic Model Based on High Resolution Urban Hydrological Unit

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Identification

• Journal: Water
• Year: 2025
• Date: 2025-12-30
• Authors: Pan Wu, Tao Wang, Zhaoli Wang, Haoyu Jin, Xiaohong CHEN
• DOI: 10.3390/w18010092

Research Groups

Not explicitly mentioned in the provided text.

Short Summary

This study develops and applies a novel high-resolution urban hydrological units model (HRGM) coupled with a 2D hydrodynamic model (LISFLOOD-FP) to improve flood inundation simulation accuracy in highly urbanized regions, demonstrating significantly enhanced performance compared to existing models.

Objective

• To develop a new, high-resolution method for flood inundation simulation in highly urbanized regions, based on urban hydrological units, to overcome the limitations of existing models in meeting accuracy requirements.

Study Configuration

• Spatial Scale: Fine-grained urban hydrological units within a specific watershed (Chebeichong watershed), with potential application at urban agglomeration scales.
• Temporal Scale: Event-based, focusing on rainstorm and flood events (e.g., 10 August 2021 rainstorm).

Methodology and Data

• Models used: High-resolution Urban Hydrological Units model (HRGM), 2D hydrodynamic model (LISFLOOD-FP), SWMM model (for comparison).
• Data sources: Observed data and measured results for model calibration and validation.

Main Results

• The coupled HRGM-LISFLOOD-FP model successfully simulated flood inundation in the Chebeichong watershed, with simulations aligning well with observed data.
• The model achieved a Nash efficiency coefficient above 0.8 under typical rainfall events.
• Compared to the SWMM model, the HRGM-LISFLOOD-FP significantly improved simulation accuracy; for the 10 August 2021 rainstorm, the Nash coefficient increased from 0.7 to 0.85, and the peak flow error decreased from 15.8% to 3.1%.
• The study emphasizes that urban waterlogging distribution is patchy, discontinuous, and fragmented due to urban infrastructure.

Contributions

• Introduction of a novel high-resolution Urban Hydrological Units model (HRGM) structure that replaces coarse sub-catchments with a fine-grained network of urban hydrological units.
• Development of a primary innovation: a node-based coupling strategy where HRGM provides precise overflow hydrographs at drainage inlets as point sources for LISFLOOD-FP, rather than diffuse runoff inputs.
• Demonstrated significant improvement in urban flood inundation simulation accuracy compared to conventional models like SWMM.
• Provides a framework with potential for application in other urban agglomeration scales for flood risk assessment and disaster mitigation.

Funding

Not explicitly mentioned in the provided text.

Citation

@article{Wu2025Framework,
  author = {Wu, Pan and Wang, Tao and Wang, Zhaoli and Jin, Haoyu and CHEN, Xiaohong},
  title = {A Framework for Refined Hydrodynamic Model Based on High Resolution Urban Hydrological Unit},
  journal = {Water},
  year = {2025},
  doi = {10.3390/w18010092},
  url = {https://doi.org/10.3390/w18010092}
}