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Effect of Discharge on the Nonlinear Bar Growth: A Flume Experiment — arXiv:2608.05593

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.05593
License (as archived): CC0-1.0
Archived: 2026-10-31T11:03:18.073Z
SHA-256 of the archived text: 5e7afdde2d8bf37948de2f33633e62034e48d6ffc381cfb4ad0f7bc614cf5cff
Stable URL of this page: https://metraipolis.com/documento/dc_11baaaeee306

How to cite

Effect of Discharge on the Nonlinear Bar Growth: A Flume Experiment — arXiv:2608.05593 — arXiv (en), https://arxiv.org/abs/2608.05593 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_11baaaeee306 (Metraipolis archive dc_11baaaeee306, sha256 5e7afdde2d8bf37948de2f33633e62034e48d6ffc381cfb4ad0f7bc614cf5cff)

BibTeX

@misc{dc11baaaeee306,
  title = {Effect of Discharge on the Nonlinear Bar Growth: A Flume Experiment — arXiv:2608.05593},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.05593},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_11baaaeee306; sha256 5e7afdde2d8bf37948de2f33633e62034e48d6ffc381cfb4ad0f7bc614cf5cff},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.05593. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Alternate bars are ubiquitous bedforms in alluvial rivers, and excessive bar-height growth can increase flood risk and disrupt ecosystems. Predicting bar-height variability requires quantifying the dependence of bar growth rate on water discharge, yet this has rarely been achieved because conventional flume measurements interrupt the flow and cannot continuously capture bar evolution. Here we conducted laboratory experiments under four discharges and four channel slopes (16 conditions) and continuously mapped bed topography using Stream Tomography, a nonintrusive, flow-through measurement technique. Bar height exhibits sigmoidal growth and is well described by the Landau equation, allowing robust estimation of the growth rate and equilibrium height. The inferred dimensionless growth rate tends to increase as discharge decreases, but its sensitivity is weaker than that predicted by stability theory for a single alternate-bar mode. This discrepancy becomes more pronounced at lower discharge, indicating limitations of linearization and the influence of interactions among multiple bar modes. Furthermore, numerical flow simulations over the measured bed topography reveal that, during bar development, lower-discharge conditions produce a relatively larger bar height-to-depth ratio, making the flow more prone to deflection. In such cases, sediment transport is restricted downstream of depositional areas, thereby limiting bar migration. Consequently, flow and sediment transport become concentrated in the scour zones, enhancing local scour and promoting the growth of bar height. These results provide benchmark constraints for bar stability theories and help improve predictions of how bar height responds to changes in discharge.

Tema degli esploratori: terra, clima ed energia (retro-catalogo arXiv: annunci del 2026-08-07 in physics.geo-ph).
Categorie arXiv: Fluid Dynamics (physics.flu-dyn) ; Geophysics (physics.geo-ph).
Pagina del lavoro: https://arxiv.org/abs/2608.05593 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-31T10:53:40.146Z dalla pagina https://arxiv.org/catchup/physics.geo-ph/2026-08-07?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).