PADANG - Expert from the Faculty of Engineering, Andalas University (Unand), West Sumatra (Sumbar) Prof Mas Mera emphasized the importance of paying attention to three aspects related to building resilience in mitigating hydrometeorological disasters in coastal areas.
"First, identify the dominant style," he said in Padang, Sunday.
The identification of this dominant style is aimed at understanding whether the main problem is the energy of perpendicular wave or the transport of parallel coastal sediments. Second, the appropriateness of the typology is not to impose one type of structure (such as a groin) if the natural characteristics require another structure such as a breakwater.
The third aspect that must be considered in building and mitigating hydrometeorological disasters on the coast is the synchronization of performance where it is necessary to ensure the position of building structures is able to trigger the accretion or natural land addition.
In his comparative research and study, Prof. Mas Mera said that if a beach has abrasion problems due to perpendicular waves that are then forced to build a groin but the typology is wrong, in addition to not being effective in resisting abrasion, it also endangers public safety because it triggers the emergence of artificial currents along the side of the structure.
"The beach will be very dangerous for the community and tourists who swim," said the professor of fluid mechanics and hydraulics at Unand.
He said the main problem of the functional failure of the protective infrastructure was not due to the quality of the material, but rather the inaccuracy of the selection of building typologies due to a lack of understanding of the physical working mechanism of the structure in responding to local hydraulic energy.
He exemplified the functional failure due to the inaccuracy of this typology was successfully overcome through engineering based on natural characteristics. In Muaro Putuih Beach, Agam Regency, the conventional groin building that was ineffective in holding perpendicular waves was modified into a T-Head Groin.
"This addition of the groin head successfully converts the function of the structure into a wave breaker that creates a calm zone and triggers massive sedimentation," he said.
In theory, he said, the groin building is only suitable for parallel coastal currents. As for the waves that come perpendicular to the beach, the wave breaker is a suitable choice as a protective structure. Behind the wave breaker, a tombolo will be formed so that the area can be planted with trees.
"In addition, the beach behind it can also be used as a place for tourists to play, including children," he said.
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