mitan new project to rebuild islands

We all know due to global warming sea level is rising glaciers are melting. The cities like Venice in Italy is already drawn France also faced the major flood from sea last year. In these situations the danger to extinction of these islands have increased.

To tackle these conditions and reduce the threat, a research team from MIT in a project used ocean waves to move sand onshore with the help of submersible bladders. This could be used to add to the overall landmass of at-risk islands or coastal towns.

In early testing, the technology has added more than a foot and a half to the shoreline of a small island in the Maldives, moving the equivalent of 10,600 cubic feet of sand onto shore in four months.

‘By collaborating with the natural forces of the ocean we believe we can promote the self-organization of sand structures to grow islands and rebuild beaches,’ Tibbits said in an interview with MIT News.

The method is a sustainable approach to the problem that can eventually be scaled to many coastal areas around the world, just as forest management is used to help strengthen and protect forests from uncontrolled fires or overgrowth.

rebuild islandHow submersible bladders will rebuild islands

The project is built around submersible bladders filled with either air or sand, which are then installed on the ocean floor at strategic locations.

rebuild island diagram
The team developed a number of different bladder types, including sand-filled ones and air-filled ones that can be placed at different depths to help adjust to shifting weather or ocean currents as described in figure

The bladders act as natural ramps and lift ocean waves up higher than normal, and when the waves crash down on the other side of the ramp, the force pushes sand from the ocean floor a little further up onto shore.

coastal areas rebuilding diagramSkylar Tibbits (the lead researcher of this project), had started this project since he was invited to the Maldives by Invena, a technology and investment group searching for ways to help low-lying island nations protect themselves from rising sea levels.

According to the data, around 40 percent of the world’s population lives in coastal regions or island countries that will be threatened by rising sea levels.

Some previous efforts have focused on dredging sand from the ocean floor with industrial machinery and moving into onshore, but they wants some  skeptical about the long term viability of this method.

Related: Top 5 organisations developing technology to clean ocean

For the research they had collected some data like how frequently small sandbars formed and then disappeared again based on the interplay of reefs and small rock formations with the changing ocean currents. These formations behave like natural depth variations, reef structures, or volcanic formations and can function similarly in promoting sand accumulation.

They wants to create an adaptable versions of these geometries which can be easily moved, reoriented, or deployed whenever seasons change or storms are increasing. These could be used in future on large scale to protect many low-lying islands.


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