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<p>The integration of oscillating water columns (OWCs) with piles to create a dual-function OWC-pile breakwater presents an innovative approach for harbor construction and coastline protection while enabling wave energy utilization. Local scour significantly impacts foundation safety and is crucial for structural design. This study examines wave-induced local scour at a dual-function OWC-pile breakwater through experimental methods. A high-resolution laser scanner tracked the development of 3D local scour profiles at various time intervals under regular wave conditions. The analysis focused on key parameters including scour-hole development time scale, dimensions, reflection and transmission coefficients, and energy extraction efficiency during scour evolution. The integration of OWCs substantially increased the equilibrium scour depth compared to conventional pile breakwaters, potentially affecting foundation stability. The scour profile development showed minimal impact on wave energy conversion efficiency. Wave transmission and reflection remained largely unaffected by scour holes, as verified through a semi-theoretical wave scattering model for pile breakwaters. An existing time-scale formula for predicting scour depth onset in isolated circular piles under current action demonstrated reasonable accuracy in this application. The study examines the mechanisms behind increased equilibrium scour depth due to OWCs and proposes design recommendations to mitigate scour-hole depth increases.</p>

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An Experimental Study of Wave-Induced Local Scour at a Dual-Function OWC-Pile Breakwater

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Cong-hao Xu,
  • Qing Wen,
  • Pei-ge Li,
  • Hu-chen Liu,
  • Zhen-hua Huang

摘要

The integration of oscillating water columns (OWCs) with piles to create a dual-function OWC-pile breakwater presents an innovative approach for harbor construction and coastline protection while enabling wave energy utilization. Local scour significantly impacts foundation safety and is crucial for structural design. This study examines wave-induced local scour at a dual-function OWC-pile breakwater through experimental methods. A high-resolution laser scanner tracked the development of 3D local scour profiles at various time intervals under regular wave conditions. The analysis focused on key parameters including scour-hole development time scale, dimensions, reflection and transmission coefficients, and energy extraction efficiency during scour evolution. The integration of OWCs substantially increased the equilibrium scour depth compared to conventional pile breakwaters, potentially affecting foundation stability. The scour profile development showed minimal impact on wave energy conversion efficiency. Wave transmission and reflection remained largely unaffected by scour holes, as verified through a semi-theoretical wave scattering model for pile breakwaters. An existing time-scale formula for predicting scour depth onset in isolated circular piles under current action demonstrated reasonable accuracy in this application. The study examines the mechanisms behind increased equilibrium scour depth due to OWCs and proposes design recommendations to mitigate scour-hole depth increases.