Rising sea level may hit 329 islands, including ones in Ernakulam

K.S. Sudhi
The Hindu, KOCHI,April 5, 2014 

The islands in Ernakulam Channel namely Willington Island, Ochanthuruthu, Appangad, Manjanakad, Vallarpadam, Thanthonnithuruthu and Mulavukad may be hit by rising sea level.

The researchers of the Centre for Earth Science Studies, Thiruvananthapuram, have bracketed these islands along with the other vulnerable ones in the backwater system of the State. They have estimated that as many as 329 backwater islands of Kerala are vulnerable to the impacts of Sea Level Rise (SLR).

The other islands identified in the region include the Komanthuruthu, Thevara, Nettoor, Maradu, Panampukad and Pizhala. Altogether, 33 islands in Ernakulam Channel have been identified as ones vulnerable to Sea Level Rise.

Kadamakudi, part of Mulavukad, Korumkotta, Moolampally, Cheranalloor, Kothad, Idakunnam and Chennur are also in the vulnerable list. Researchers have sounded alert that the islands of Kumbalanghi, Chattammel, Cheppanam, Valanthakadu, Kumbalam, Panangad located in Kaithappuzha Kayal in the city suburbs too may be hit by Sea Level Rise.

In Vembanad Lake, they have assessed 21 islands namely Pathiramanal, Anjuthuruthu, Amayadithuruthu and Perumbalam as the ones that may be hit by the rising waters. They feared that the extensive backwater system of the State including the “communities on the banks, ecosystems, low-lying filtration ponds, adjoining paddy fields and other infrastructure would face increased stress” due to the sea level rise.

The list has included the 25 islands in Ashtamudi Lake, 14 in the Periyar, 17 in the Bharathapuzha and 14 in the Valapattanam River among others.

The rampant reclamation of wetlands, including filtration ponds, could decrease the available area of flood plains and enhance the impact of sea level rise on the adjacent holdings, according to the scientific document prepared by the scientists.

A team of researchers led by K.V. Thomas of the CESS are working on a project for assessing the impact of Sea Level Rise and the identification of impact zones in the State. The Sea Level Rise, according to researchers, is of serious concern in Kerala which has a 590km-long coastline and large expands of backwaters and estuaries and low-lying areas such as filtration ponds.

Researchers pointed out that the presence of filtration ponds, which are low-lying areas, near many of the backwater islands increased their vulnerability. They pointed out the case of Sattar Island located in the Periyar River near Munambam, which was seriously affected during the tsunami in 2004.

The identification of the impact zone is crucial for planning mitigation measures and evolving adaption programmes.