New Islands Appear in NTT After Seroja Storm, BMKG Explains
A new island appeared in Loaholu District, Rote Ndao Regency, East Nusa Tenggara (NTT) after the tropical cyclone Seroja that struck on April 5, 2021.
Head of the Earthquake and Tsunami Mitigation Division of the Meteorology, Climatology and Geophysics Agency (BMKG), Daryono, explained that the appearance of this kind of island is strongly suspected to be the phenomenon of littoral drift or longshore drift.
“The phenomenon that occurs in the waters of Rote Ndao Regency, East Nusa Tenggara (NTT), which is the emergence of a small island after the Seroja tropical storm, according to me, is strongly suspected of being the phenomenon of littoral drift or longshore drift,” said Daryono quoted from his personal social media. , Tuesday (20/4/2021).
Daryono explained that this phenomenon occurs due to the presence of ocean currents along the coast that can carry shallow sediments from sand or other materials.
“The existence of a shallow flow that forms the drift of the debris material allows the deposition of the material which then collects and concentrates in one location to form an elongated” island “,” he explained.
In addition, Daryono said that the attack of the Seroja storm that occurred some time ago, of course, was able to generate sea waves which have a very significant material carrying capacity to allow the material to be deposited in a location to form an “island”.
“However, this island will not be permanent because someday the dynamics of the sea will cause abrasion to occur and turn it into the seabed again. The phenomenon of rising and sinking the surface of this sand island is a common thing, ”he said.
Therefore, Daryono emphasized that this was not the emergence of a new island, only a phenomenon of rising and falling sand island surfaces. “The emergence of a new island? Not! The phenomenon of rising and falling on the surface of this sand island is a common thing, ”he said.