The coastal belt in Karnataka has been witnessing wind and high tides due to cyclonic depression, due to these many houses are facing threat due to rough sea waves.Sea walls constructed at Mukkachery have been breached and several houses on the coast close to the sea were in danger.
The district administration decided to take rehabilitation work of existing breached portion of sea wall by using tetra pods and sand filled geotextile bags, which will reduce the further erosion of the beach and provide indirect protection to the neighboring property which was damaging due to heavy wave action.
Rehabilitation of seawall at Mukkachery
Main challenge was timeline to install geotextile bags as wave action was deflected off the wall and concentrated on the sides and it was quickly eroding the shore line as well as damaging the neighbouring properties, so authority has suggested completing the work as early as possible in this difficult situation.
The one of the major cause behind failure of rock sea wall was migrating of sand from the base. To prevent sand migration, it was suggested to use sand filled geotextile bag, which was laid at the base sea wall to make the base stable.
Construction of Sea wall by using Tetra pods and stones as structural elements was proposed. Tetrahedral shape allows dissipating the force of incoming waves by allowing water to flow around rather than against them and helps to reduce displacement by interlocking.Tetra pods protect coastline property from erosion by the sea.
Execution on Site:
Project was executed in 2019 -2020.Client was happy with quality of Geotextile bags and completed the supply in time. Project is still under observation and will be observed through Defects Liability Period of project.
