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Volume 21, Issue 48 (12-2025)
marineeng 2025, 21(48): 135-146 |
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Asadi S, Shabakhty N. Experimental Investigation on Mooring Line Forces in a Porous Pontoon-Type Floating Breakwater with a Wave Energy Dissipating Sub-Structure. marineeng 2025; 21 (48) :135-146
URL: http://marine-eng.ir/article-1-1221-en.html
URL: http://marine-eng.ir/article-1-1221-en.html
1- School of Civil Engineering, Iran University of Science and Technology
2- School of Cvil Engineering, Iran University of Science and Technology
2- School of Cvil Engineering, Iran University of Science and Technology
Abstract: (29 Views)
Floating breakwaters have recently attracted increasing attention as one of the effective solutions for wave energy control and attenuation, particularly due to their ability to be deployed in deep waters, rapid installation, ease of relocation, and prevention of sediment accumulation. However, the mooring system remains one of the most vulnerable components of these structures, as most structural damages typically occur in the connection zones. Therefore, an efficient design is achieved only when, in addition to ensuring proper hydrodynamic performance, the forces acting on the mooring lines are effectively controlled. In this study, aiming to reduce mooring forces and enhance structural stability, the effects of two key parameters, pontoon porosity and the presence of an energy dissipating sub-structure, were experimentally investigated. The experiments were carried out in the wave flume of Iran University of Science and Technology (IUST) using a 1:30 scale physical model of a porous twin-pontoon floating breakwater, tested under 40 regular wave conditions with varying wave heights and periods. The variations of forces in the front and rear of mooring lines were measured, and the results were compared for different porosity levels and the presence or absence of the sub-structure.
The findings revealed that increasing pontoon porosity significantly reduces mooring forces, while the effect of the sub-structure depends on the wave period and may exhibit dual behavior—either reducing or increasing the mooring loads. Moreover, the front and rear mooring lines exhibited distinct responses to changes in wave height and period. These results can serve as a practical guideline for the optimal design of porous floating breakwaters equipped with energy-dissipating sub-structures.
The findings revealed that increasing pontoon porosity significantly reduces mooring forces, while the effect of the sub-structure depends on the wave period and may exhibit dual behavior—either reducing or increasing the mooring loads. Moreover, the front and rear mooring lines exhibited distinct responses to changes in wave height and period. These results can serve as a practical guideline for the optimal design of porous floating breakwaters equipped with energy-dissipating sub-structures.
Keywords: Wave Energy Dissipating, Pontoon-Type Floating Breakwater, Mooring Forces, Experimental Investigation
Type of Study: Research Paper |
Subject:
Marine Structures and near shore
Received: 2025/10/19 | Accepted: 2026/05/21
Received: 2025/10/19 | Accepted: 2026/05/21
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