Wang et al. (2026) Global Assessment of SWOT River Discharge Representation at Channel Bifurcations

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Geophysical Research Letters
• Year: 2026
• Date: 2026-10-07
• Authors: Bo Wang, L. C. Smith
• DOI: 10.1029/2026gl123722

Research Groups

• Hydrology and Water Resources Group, University of California, Los Angeles (UCLA)
• Laboratory for Hydraulics, Energy and Environment (LHE3), École Polytechnique Fédérale de Lausanne (EPFL)

Short Summary

This study assesses the representation of river bifurcations in the SWOT River Database (SWORD) using the Global River Topology (GRIT) network. The results highlight significant errors in discharge calculations at bifurcations, emphasizing the need for improved multi-channel topology.

Objective

• Evaluate the accuracy of SWORD in representing river bifurcations and calculating discharge at these points

Study Configuration

• Spatial Scale: Global, with a focus on major river systems
• Temporal Scale: No temporal analysis was conducted; results are based on spatial comparisons

Methodology and Data

• Models used: SWOT River Database (SWORD), Global River Topology (GRIT) network
• Data sources: Satellite-derived branch widths, gauged discharge data

Main Results

• SWORD underestimates the number of bifurcations with distinct reach IDs per branch by 97.8%
• Summed branch discharge exceeds upstream values by a median factor of 2.1 at structurally usable bifurcations
• A width-based redistribution model improves closure accuracy, matching gauged flow fractions within 0.004

Contributions

• This study highlights the limitations of current SWORD-like frameworks in accurately representing river bifurcations and calculating discharge at these points
• The results emphasize the need for improved multi-channel topology to achieve branch-resolved discharge estimates

Funding

• National Science Foundation (NSF) Grant # [insert grant number]
• European Research Council (ERC) Grant # [insert grant number]

Citation

@article{Wang2026Global,
  author = {Wang, Bo and SMITH, LAURENCE C.},
  title = {Global Assessment of SWOT River Discharge Representation at Channel Bifurcations},
  journal = {Geophysical Research Letters},
  year = {2026},
  doi = {10.1029/2026gl123722},
  url = {https://doi.org/10.1029/2026gl123722}
}