Nakayama (2026) Effects of Water Diversion on Hydrological and Vegetation Dynamics in a Downstream Wetland Ecosystem

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

Identification

• Journal: Hydrological Processes
• Year: 2026
• Date: 2026-06-25
• Authors: Tadanobu Nakayama
• DOI: 10.1002/hyp.70624

Research Groups

• Hydrology Laboratory, University of Tokyo
• Department of Environmental Science, Nagoya University
• Institute of Low Temperature Science, Hokkaido University

Short Summary

This study evaluates the long-term impacts of small-scale water diversion on hydrological processes and downstream vegetation dynamics in a Japanese wetland basin using a process-based model. The results indicate significant changes in lake water balance, riverine inflow, and vegetation shifts due to altered hydrology.

Objective

• Investigate the effects of upstream water diversion on hydrological processes and downstream vegetation dynamics in a small-scale wetland basin over 57 years.

Study Configuration

• Spatial Scale: Basin scale (Lake Ozenuma–Ozegahara Marsh)
• Temporal Scale: Long-term (1955–2012)

Methodology and Data

• Models used: NICE-BGC model
• Data sources: Satellite imagery, observation data from field measurements

Main Results

• Significant changes in lake water balance and diversion practices influenced downstream hydrology, including discharge to the Nushiri River and water level dynamics in Ozegahara Marsh.
• Vegetation shifts occurred due to long-term changes in surface water and groundwater regimes, in addition to climatic influences.

Contributions

• This study provides a basis for assessing basin-scale hydrological alteration and identifying groundwater-dependent wetland ecosystems.
• The results inform adaptive management strategies for wetland conservation under altered hydrological regimes.

Funding

• Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 15H05714, 18H01255

Citation

@article{Nakayama2026Effects,
  author = {Nakayama, Tadanobu},
  title = {Effects of Water Diversion on Hydrological and Vegetation Dynamics in a Downstream Wetland Ecosystem},
  journal = {Hydrological Processes},
  year = {2026},
  doi = {10.1002/hyp.70624},
  url = {https://doi.org/10.1002/hyp.70624}
}