Earthquake and Tsunami Effects Open access Peer reviewed

DAM-BREAK EXPERIMENTS ON THE EFFECT OF ROUGHNESS BLOCKS IN OPEN-CHANNELS

Akihiko Obata, Naofumi TERAMOTO, Yuki TAKADATE, Wei Ding

AIJ Journal of Technology and Design | Jun 19, 2026

Abstract

Abstract

Dam-break experiments simulate the sudden release of stored upstream water and its impact on a model. Since the stored water depth is the only adjustable parameter, it is difficult to control the flow velocity and inundation depth. In this study, roughness blocks were installed on the channel bed to regulate the flow, and the effects of their arrangement and height were examined. These blocks reduced the flow velocity, Froude number, and the drag forces on the model. The results revealed that the drag coefficients on the model depended on whether the dam-break flow overtopped or bypassed the roughness blocks.

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Authors

Researchers on this paper

Akihiko Obata

first | Akita University

Naofumi TERAMOTO

middle | National Institute of Technology Akita College

Yuki TAKADATE

middle | KRI

Wei Ding

last | National Institute of Technology Akita College | ORCID 0000-0001-9866-8073

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Citation

BibTeX

@article{Obata2026BREAK,
  title = {DAM-BREAK EXPERIMENTS ON THE EFFECT OF ROUGHNESS BLOCKS IN OPEN-CHANNELS},
  author = {Akihiko Obata and Naofumi TERAMOTO and Yuki TAKADATE and Wei Ding},
  journal = {AIJ Journal of Technology and Design},
  year = {2026},
  doi = {10.3130/aijt.32.616},
  url = {https://doi.org/10.3130/aijt.32.616}
}

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