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Home / Artificial Beach Cofferdam System for Island Resorts
Project Background
Artificial beaches have become an essential feature of modern island resort developments. They enhance waterfront landscapes, improve coastal accessibility, and increase the overall value of hospitality projects.
However, beach construction is typically carried out in shallow marine environments where tides, waves, and currents can significantly affect hydraulic filling operations. Without an effective containment structure, fill materials may be washed away, resulting in lower construction efficiency, increased project costs, and environmental impacts.
To establish a controlled construction environment, a reliable cofferdam system is required to isolate the work area from open water while retaining fill materials during beach nourishment.
HOKBG Geo Tube Cofferdam Solution
HOKBG provides a High-Strength UV-Resistant Geo Tube Cofferdam System specifically developed for island developments, artificial beach construction, coastal protection, marine infrastructure, and land reclamation projects.
The system utilizes HOKBG High-Strength UV-Resistant Geo Tubes filled with clean sand or low-silt sand to create a stable containment structure. Designed for demanding marine environments, the system delivers outstanding structural stability, long-term durability, and excellent resistance to ultraviolet exposure.
Depending on project requirements, the system can function either as a temporary cofferdam during construction or as a permanent coastal structure when protected with Concrete-filled membrane bag, precast concrete panels, rock armor, or other engineered revetment systems.
Temporary Cofferdam System
During beach nourishment and reclamation works, HOKBG Geo Tubes are rapidly installed to form a temporary containment barrier.
The enclosed construction area minimizes sand loss, improves filling efficiency, and effectively controls suspended sediment dispersion. After project completion, the temporary structure may be removed or incorporated into the permanent coastal works.
Permanent Cofferdam System
For long-term coastal protection or waterfront infrastructure, HOKBG Geo Tubes can be integrated into permanent engineering structures.
The completed Geo Tube core may be protected with Concrete-filled membrane bag, precast concrete panels, rock revetments, or other engineered protection systems, combining rapid installation with long-term structural durability.
Construction Procedure
STEP 01
Site Survey & Layout:
GPS surveying equipment is used to establish the cofferdam alignment and construction control points.
STEP 02
Geo Tube Installation:
The lightweight HOKBG High-Strength UV-Resistant Geo Tubes can be manually deployed, positioned, and connected without the need for heavy lifting equipment. This significantly reduces equipment requirements and improves construction efficiency, particularly for island resorts and remote coastal projects.
STEP 03
Sand Filling:
The Geo Tubes are hydraulically filled using sand pumps.
Clean medium-to-coarse sand or low-silt sand is recommended to achieve optimum drainage performance, rapid consolidation, and long-term structural stability.
STEP 04
Multi-layer Construction:
Depending on the design requirements, Geo Tubes are installed in single or multiple layers.
The finished height of each layer typically ranges from 0.5 m to 2.0 m, while staggered stacking enhances structural integrity and sliding resistance.
STEP 05
Beach Nourishment:
Following completion of the cofferdam, hydraulic filling operations are carried out until the designed beach profile is achieved.
Performance Benefits
- Manual installation without heavy lifting equipment
- Rapid deployment and shortened construction schedule
- Excellent UV resistance and long-term durability
- Reduced construction costs and equipment requirements
- Flexible design for temporary or permanent applications
- Environmentally responsible construction with reduced sediment dispersion
- Suitable for island resorts, coastal protection, land reclamation, and marine infrastructure
Unlike conventional rock-fill or sheet pile cofferdams, the HOKBG High-Strength UV-Resistant Geo Tube System provides a lightweight, rapidly deployable, and environmentally friendly alternative for both temporary and permanent coastal engineering applications.
Typical Applications
- Artificial Beach Construction
- Island Resort Development
- Temporary Marine Cofferdams
- Permanent Coastal Protection Structures
- Land Reclamation Projects
- Port Expansion Works
- Shoreline Stabilization
- Marine Infrastructure Development
| Parameter | Specification |
| Product | HOKBG High-Strength UV-Resistant Geo Tube |
| Tensile Strength | 35–250 kN/m |
Elongation at Break | ≥23% |
UV Resistance | Retains 97% of mechanical properties after 500 hours of UV exposure |
Sewing Strength | ≥70% of the base fabric tensile strength |
| Finished Tube Height | 0.5–2.0 m per layer |
Recommended Filling Material | Clean Sand or Low-Silt Sand |
Installation Method | Manual Placement (No Heavy Lifting Equipment Required) |
Structure Type | Temporary Cofferdam / Permanent Cofferdam |
Permanent Protection Options | Concrete-Filled Membrane Bag, Precast Concrete Panels, Rock Revetment |
Typical Applications | Artificial Beaches, Island Resorts, Coastal Protection, Land Reclamation, Marine Construction |
Geotextile Tubes: Structural Safety & Durability Challenges
Pain Point 01
Rapid Material Aging Shortens Project Lifespan
Customer Concern:
Traditional geotextile tubes degrade quickly under UV exposure and seawater erosion, leading to strength loss, cracks and breakage within a year. This results in sand leakage, embankment failure and high repair costs.
Solution:
Use UV-resistant high-strength geotextile tubes (tensile strength 35–250 KN/m, elongation >23%). With special treatment, the tubes can withstand natural exposure for 3 years in any marine environment, reducing embankment repair costs from the source.
Pain Point 02
Weak Seam Strength Causes Tube Rupture
Customer Concern:
Conventional tubes are stitched with portable sewing machines, with seam strength ≤30% of base fabric. When filled with sand, seawater pressure often tears the seams, especially in ports with large tidal differences.
Solution:
Adopt industrial four-line parallel stitching, ensuring seam strength ≥70% of base fabric. With trapezoidal staggered stacking, overall shear resistance improves by 40%, preventing chain reactions from local damage.Silt Curtains: Environmental Compliance & Efficiency Challenges
Pain Point 01
Poor Design Leads To Low Pollution Control, Risk Of Penalties
Customer Concern:
Conventional silt curtains use mixed fabrics sewn together, with overall strength <50% of base material. They fail under wave impact, leading to breakage, excessive turbidity, fishery disputes, fines and suspension risks. Sediment interception is often <60%.
Solution:
Useing high-strength permeable fabric in an integrated structure. Curtain strength = 100% of base fabric. With sandbag ballast (non-corrosive), sediment interception reaches >90%, while dissipating wave energy and ensuring compliance (permeability coefficient 1.5×10⁻³ m/s).Pain Point 02
Poor Durability, Frequent Replacements
Customer Concern:
Standard silt curtains lack UV resistance and seawater durability, lasting less than 1 year. This requires annual replacement, raising offshore operation costs and delaying schedules.
Solution:
Use anti-aging integrated silt curtains, durable for 3 years in seawater, cutting life-cycle cost by 50%.Geotextile Fabrics: Foundation Stability Challenges
Pain Point 01
Low Tensile Strength Causes Excessive Settlement
Customer Concern:
The bearing capacity of the foundation in land reclamation is uneven and traditional geotextiles (tensile strength <30KN/M) are easy to tear, resulting in uneven foundation settlement of more than 300mm, affecting subsequent wharf construction.
Solution:
By selecting high-strength woven geotextile (tensile strength 35KN-250KN/M) and combining it with the “sand-gravel-geotextile” composite cushion design, the uneven settlement of the foundation is controlled within 150mm, meeting the requirements for the later construction of the port terminal.
Pain Point 02
Imbalanced Water Filtration Performance
Customer Concern:
The water filtration rate of geotextile is slow (less than 0.5m/h), which leads to uneven foundation settlement and silt bags, increasing the difficulty of subsequent construction.
Solution:
By optimizing the pore structure of geotextiles (equivalent pore size 0.1-0.3mm), the water filtration rate is increased to 1.2m/h, and the construction efficiency is improved by 60%.Pain Point 03
Insufficient Aging Resistance
Customer Concern:
The aging resistance of the geotextile cannot meet the requirements of one year of natural exposure at the project site. During the exposure process, the geotextile becomes brittle, resulting in uneven settlement.
Solution:
Our geotextiles can withstand 365 days of exposure in any region of the world, with a strength retention rate of more than 70% and an elongation rate of more than 70%, ensuring the fabric is intact.Constructing new marine settlements
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