File file POONTHURA COAST IN THIVANANTHAPURAM | Photo Credit: Hind
A study conducted by the National Institute of Ocean Technology, Kerala State Coastal Area Development Corporation (KSCADC), and experts in the coastal engineering of the Vlnolam system at sea using Geotube technology along the coastal section along the coastal influence.
One of the main results was the effective prevention of wool beyond the sea wall and extended about twice the length of the wavy at sea on the coastal side. In particular, it turned out that the resulting formation on the beach is sustainable even under unfavorable weather conditions. Three layers of geotub, each of which has a perimeter of 15 m, are located on 6 m to 7 m deep parallel to the seabed. Each layer of tubes is located vertically on the beach with sufficient length in wave approach against conventional approach to placing in parallel with the coast.
The installation includes five units, each unit of the wavyle beyond 100 ms of a fixed distance of 50 meters between them. The composite structure of the geotubička germics under the sea level serves as a barrier and reduces the power of large waves that is approaching the coast. This design not only relieves the risk of coastal erosion, but also facilitates the accumulation of other sand between the existing coast and sea, which supports the development of a wider beach.
The study also revealed that the upper layer separated from the geotubička due to the intensive swaying movement of the sea, which led to the escape of sand through it. Despite this, the investigation confirmed that the geotubičky remained safely in place without any signs of carriage, mainly because of the sand firmly anchored in the four corners of the tube. The analysis also indicated that all geotubičky in the lower layer underwent complete consolidation and stabilization.
The state government sanctioned the Crore 20 GBP through the Keral Investment Fund Council (KIIFB) for implementing the wavyam system at sea using Geotube technology. Geotubes acts as an effective barrier and reduces the power of the upcoming sea waves. The result is a softer wave action that loads sand particles on the coast and creates a stable and usable beach.
Due to the heavy underway in the area, the location and spread of the geotubička was cumbersome. Experienced divers previously associated with the Indian Navy were specifically involved in work. The location of geotub in the deep seabed was a significant challenge due to rolling caused by strong currents and wave disorders, which led to initial failure in operation. After detailed negotiations between the participating agencies, 250 kg of concrete anchor blocks were deployed on all sides, which ensured that it was securely fastened with divers.
Published – May 11, 2025 20:46
