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<p>In many countries, the intensive use of coastal zones has become a major management concern. Building harbours, supporting fishing fleets, hosting recreation, extracting resources, producing energy, housing industry, and supplying water have together turned shorelines into busy, multipurpose areas. These same coastlines are also often exposed to high-energy waves that steadily erode the shore. Breakwaters serve as the primary defence structures that safeguard coastlines from wave impacts. This study presents an experimental investigation to evaluate the performance of multilayer geosynthetic tube (geotube) breakwaters in coastal protection. However, there are possible geotube failures caused by sand migration or intensive wave actions. To enhance energy dissipation at a specific location of interest on a long submerged breakwater, an armour unit like cement concrete (C.C.) block may be incorporated alongside the geotube breakwater system to counter the force of the incoming waves striking the breakwater. With a focus on various configurations, this study examines the efficacy of breakwaters in terms of their ability to reduce the incident wave heights. Different breakwater units were composed with and without C.C. blocks, and variations in the width and number of geotubes were used in the arrangements. Twenty-seven experimental scenarios were conducted to evaluate the influence of different breakwater configurations, structure heights, relative submergences and widths on wave transmission coefficients (C<sub>t</sub>). The configurations examined three types of geotube breakwater. The main discoveries indicate that incorporating C.C. blocks with geotube greatly enhanced the efficiency of the geotube breakwaters by dissipating the incoming wave energy, demonstrating the most substantial results with a C<sub>t</sub> value reaching as low as 0.46, which led to a 54% decrease in wave heights. This research offers valuable, quantified insights into the performance of geotube breakwaters in coastal protection, demonstrating the impacts of various design parameters and configurations on wave transmission. Such findings are instrumental for refining and optimizing tube breakwater designs for enhanced coastal defence.</p>

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An experimental study on the performance of multilayer geotube breakwaters with and without C. C. blocks

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Tamanna Haque Himi,
  • K. M. Ahtesham Hossain Raju,
  • Naila Matin

摘要

In many countries, the intensive use of coastal zones has become a major management concern. Building harbours, supporting fishing fleets, hosting recreation, extracting resources, producing energy, housing industry, and supplying water have together turned shorelines into busy, multipurpose areas. These same coastlines are also often exposed to high-energy waves that steadily erode the shore. Breakwaters serve as the primary defence structures that safeguard coastlines from wave impacts. This study presents an experimental investigation to evaluate the performance of multilayer geosynthetic tube (geotube) breakwaters in coastal protection. However, there are possible geotube failures caused by sand migration or intensive wave actions. To enhance energy dissipation at a specific location of interest on a long submerged breakwater, an armour unit like cement concrete (C.C.) block may be incorporated alongside the geotube breakwater system to counter the force of the incoming waves striking the breakwater. With a focus on various configurations, this study examines the efficacy of breakwaters in terms of their ability to reduce the incident wave heights. Different breakwater units were composed with and without C.C. blocks, and variations in the width and number of geotubes were used in the arrangements. Twenty-seven experimental scenarios were conducted to evaluate the influence of different breakwater configurations, structure heights, relative submergences and widths on wave transmission coefficients (Ct). The configurations examined three types of geotube breakwater. The main discoveries indicate that incorporating C.C. blocks with geotube greatly enhanced the efficiency of the geotube breakwaters by dissipating the incoming wave energy, demonstrating the most substantial results with a Ct value reaching as low as 0.46, which led to a 54% decrease in wave heights. This research offers valuable, quantified insights into the performance of geotube breakwaters in coastal protection, demonstrating the impacts of various design parameters and configurations on wave transmission. Such findings are instrumental for refining and optimizing tube breakwater designs for enhanced coastal defence.