Gong et al. (2026) Post-Regulation Hydrological and Channel-Planform Changes in the Urban Reach of the Lhasa River

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Identification

• Journal: Water
• Year: 2026
• Date: 2026-09-29
• Authors: Tongliang Gong, Zhaocai Yi, Danzeng Baima, Hanwen Liu
• DOI: 10.3390/w18192416

Research Groups

• Lhasa River Basin Research Group (LRBRG)
• Department of Hydrology and Water Resources (DHWR)

Short Summary

This study investigates the impact of hydrological regulation and local engineering on the planform dynamics of the wandering Lhasa River, integrating discharge records, satellite-image composites, and surface topography to identify changes in water area, exposed bar–island, and riparian-land classes.

Objective

• Investigate the effects of hydrological regulation and local engineering on the planform dynamics of wandering rivers

Study Configuration

• Spatial Scale: Urban Lhasa River reach between Gates 1 and 5
• Temporal Scale: 2000–2023, with a focus on changes around 2005–2006 and 2013

Methodology and Data

• Models used: None mentioned; instead, discharge records (2000–2023) and satellite-image composites (2015–2023)
• Data sources: SRTM-derived surface topography, discharge records from three stations, and nine December satellite-image composites (2015–2023)

Main Results

• Mapped water area increased by 45.39% between 2015 and 2023
• Exposed bar–island and riparian-land classes decreased by 36.29% and 61.13%, respectively
• Centerline length and sinuosity varied by less than 1%
• Nearest-neighbor bankline metric declined by 9.53%

Contributions

This study provides new insights into the effects of hydrological regulation and local engineering on river planform dynamics, highlighting the need for a pre-regulation morphological baseline, synchronous discharge and water-level observations, and surveyed hydraulic geometry to establish causal relationships.

Funding

• This research was supported by the National Natural Science Foundation of China (Grant No. 51879217) and the Fundamental Research Funds for the Central Universities (Grant No. 2019XQZZ01).

Citation

@article{Gong2026PostRegulation,
  author = {Gong, Tongliang and Yi, Zhaocai and Baima, Danzeng and Liu, Hanwen},
  title = {Post-Regulation Hydrological and Channel-Planform Changes in the Urban Reach of the Lhasa River},
  journal = {Water},
  year = {2026},
  doi = {10.3390/w18192416},
  url = {https://doi.org/10.3390/w18192416}
}