The national strategic project (PSN) titled Giant Sea Wall (GSW) was built with the aim of protecting the northern coast of Java Island, particularly Jakarta, from potential tidal flooding and erosion. This project, spanning approximately 700 km, will be carried out in several phases, including the construction of sea walls, piping systems, and other infrastructure, from Banten to Gresik, East Java. To support this project, geosynthetic products are required to function as protectors, reinforcers, filters, and controllers of seawater erosion.
Geosynthetic Materials Used in the Sea Wall Project (Giant Sea Wall)
Geosynthetics for the Giant Sea Wall Project are designed for reinforcement and protection against erosion, particularly in the base layer of the sea wall. Common types of geosynthetic products used include geomembranes, geotextiles (woven and non-woven), geobags/geotubes, geocells, geodrains, geogrids, and geocomposites. We will discuss two of these: geomembranes and non-woven geotextiles.
Geomembrane
What is a Geomembrane?
A geomembrane is a type of geosynthetic material composed of polymers such as HDPE (High-Density Polyethylene), LLDPE (Linear Low-Density Polyethylene), and other waterproof, chemical-resistant, and UV-resistant polymer materials. This material functions as a barrier to prevent water seepage into or out of the seawall system.
The Role of Geomembrane in Coastal Dike Projects
The application of geomembrane prevents seawater erosion of land and the potential for tidal flooding. Its use can extend the lifespan of the dike. Technically, geomembrane has a lifespan of 3–10 years or even longer, depending on environmental conditions such as UV rays, chemicals, and physical loads. It is not easily torn or damaged.
Non-Woven Geotextile
What is Non-Woven Geotextile?
Moving on from geomembranes, non-woven geotextiles are materials made from polymers such as polyester (PET), polypropylene (PP), and polyethylene (PE) that are bonded together through a process of bonding, heating, or pressing. Its main characteristics are high flexibility and excellent separation or filtration strength.
The Role of Non-Woven Geotextile in Coastal Dike Projects
Non-woven geotextile has several functions, including filtering fine materials like sand and separating (separating) mud or sand from stone or coarse sand materials. Its advantages include high permeability (separating and filtering water from soil material), resistance to UV rays, chemicals, and marine microorganisms.
Geomembrane and Geotextile Products for Sea Wall Projects
The Giants Sea Wall construction project aims to address the long-term risks of tidal flooding and seawater erosion, particularly in areas where the land is lower than sea level, such as Jakarta. To successfully implement this government project, high-quality, cost-effective geosynthetic materials and products are required, capable of meeting the demands of contractors and project workers. Geomembrane and non-woven geotextile products with strict quality control can provide maximum UV resistance and withstand extreme environmental conditions. Especially if they meet TKDN (Domestic Component Level) and ASTM (American Society for Testing and Materials) standards, and use 100% virgin HDPE (non-recycled) and UV-resistant carbon black.
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