Lyu et al. (2026) Internally Cross-Checked Estimation of Downstream Water-Level Response Timing During a Controlled Dam Release in a Sparsely Gauged River

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

Identification

• Journal: Hydrology
• Year: 2026
• Date: 2026-09-19
• Authors: Pengfei Lyu, Yi Tang, Hidekazu SHIRAI, Yasuharu Watanabe, Wei Xie, Toshio Eisaka
• DOI: 10.3390/hydrology13090256

Research Groups

• Department of Hydrology, University of Tokyo
• Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

Short Summary

This study investigates the downstream response timing of a controlled release on the Satsunai River in Japan using dam outflow and water-level series. The results provide a consistent event-specific description of bulk hydrograph alignment.

Objective

• Investigate whether dam-referenced lags agree with direct station-to-station estimates of downstream response timing

Study Configuration

• Spatial Scale: Reach-scale analysis on the Satsunai River, Japan
• Temporal Scale: Analysis focused on a single controlled release event in 2026

Methodology and Data

• Models used: None mentioned (hydraulic routing not available)
• Data sources: Dam outflow data and two downstream water-level series

Main Results

• Cross-correlation maxima occurred at 3.67 h and 8.00 h for Kamisatsunai and Dainikawabashi, respectively
• Station-to-station maximum lag difference matched the release-window result (4.33 h)
• Endpoint separation remained consistent across detrending and differencing transformations (3.67–4.33 h)
• Moving-block bootstrap sensitivity yielded a lag-difference envelope of 4.17–4.50 h

Contributions

• Provided an event-specific description of bulk hydrograph alignment using controlled release data
• Highlighted the importance of additional events and hydraulic observations for assessing transferability and spatial model-form uncertainty

Funding

• Not specified in the paper

Citation

@article{Lyu2026Internally,
  author = {Lyu, Pengfei and Tang, Yi and SHIRAI, Hidekazu and Watanabe, Yasuharu and Xie, Wei and Eisaka, Toshio},
  title = {Internally Cross-Checked Estimation of Downstream Water-Level Response Timing During a Controlled Dam Release in a Sparsely Gauged River},
  journal = {Hydrology},
  year = {2026},
  doi = {10.3390/hydrology13090256},
  url = {https://doi.org/10.3390/hydrology13090256}
}