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<p>This study investigates suspended sediment transport in turbulent open-surface flows with periodic coverages, represented by alternating covered and open strips with coverage ratios of 30%, 60%, and 100%. Analytical velocity profiles and eddy viscosity models are derived for these scenarios and are validated against existing experimental and numerical data. Both equilibrium and non-equilibrium suspended sediment concentration (SSC) profiles and transport rates are analyzed, with the influence of the Rouse number, upstream concentration profiles, and deposition-entrainment dynamics being elucidated. Results reveal that surface coverage significantly reduces equilibrium SSC and increases vertical non-uniformity, with the most pronounced effects observed at 30% coverage. For finer sediments (characterized by a Rouse number <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(R_n &lt; 1.6\)</EquationSource> </InlineEquation>), the total suspended sediment transport rate exhibits a substantial decline under periodic coverage, signaling a shift toward deposition-dominated regimes. In contrast, for coarser sediments (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(R_n &gt; 1.6\)</EquationSource> </InlineEquation>), transport rates demonstrate relative insensitivity to surface modifications, as the sediment mass remains predominantly concentrated in the near-bed region, away from the surface-induced turbulence. Under non-equilibrium conditions, the adaptation length required to reach equilibrium is strongly modulated by the upstream SSC, the Rouse number, and deposition rates. These findings provide a theoretical basis for predicting sediment dynamics under discontinuous surface boundaries, offering critical insights for the design and environmental impact assessment of hydraulic infrastructure such as floating solar photovoltaic (FPV) systems.</p>

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Suspended sediment transport in turbulent open-surface flows with periodic coverages

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Jinlan Guo,
  • Wing Yian Hiew,
  • Xiaodong Liu,
  • Adrian Wing-Keung Law

摘要

This study investigates suspended sediment transport in turbulent open-surface flows with periodic coverages, represented by alternating covered and open strips with coverage ratios of 30%, 60%, and 100%. Analytical velocity profiles and eddy viscosity models are derived for these scenarios and are validated against existing experimental and numerical data. Both equilibrium and non-equilibrium suspended sediment concentration (SSC) profiles and transport rates are analyzed, with the influence of the Rouse number, upstream concentration profiles, and deposition-entrainment dynamics being elucidated. Results reveal that surface coverage significantly reduces equilibrium SSC and increases vertical non-uniformity, with the most pronounced effects observed at 30% coverage. For finer sediments (characterized by a Rouse number \(R_n < 1.6\) ), the total suspended sediment transport rate exhibits a substantial decline under periodic coverage, signaling a shift toward deposition-dominated regimes. In contrast, for coarser sediments ( \(R_n > 1.6\) ), transport rates demonstrate relative insensitivity to surface modifications, as the sediment mass remains predominantly concentrated in the near-bed region, away from the surface-induced turbulence. Under non-equilibrium conditions, the adaptation length required to reach equilibrium is strongly modulated by the upstream SSC, the Rouse number, and deposition rates. These findings provide a theoretical basis for predicting sediment dynamics under discontinuous surface boundaries, offering critical insights for the design and environmental impact assessment of hydraulic infrastructure such as floating solar photovoltaic (FPV) systems.