PORT-of-SPAIN, TRINIDAD, Nov 23 2015 (IPS) – As unusually heavy rainfall battered Trinidad’s east coast a year ago, a lagoon here was overwhelmed, flooding a major access road to the island’s south-eastern communities. As the flood waters poured over Manzanilla beach, they washed sand away, caved in sections of road and collapsed a seawall at a tourist beach facility. Further damages were also incurred with the flooding of homes and agricultural plots.
The coastline of Trinidad is under threat as seas rise, storms grow heavier, and as sand is washed away. As iconic coconut trees are lapped by an encroaching sea, some of the dangers of climate change are becoming clear.
Seas in the region have been rising by more than 2 millimeters every year — though scientists are still trying to pinpoint the role of climate change in accelerating local beach erosion.
“On Manzanilla beach the sea is definitely getting closer to the land, but the primary reason may not be land deformation or sea level rise,” said Keith Miller, a senior lecturer and researcher at the University of West Indies.
“The Atlantic swell causes longshore drift and beach sediments move southward,” Miller said. “Research has been done to suggest that the sediment source has dried up to some extent, so material is being moved along the beach, but there is less material available to replace it.”
In addition to the problems on the east coast, Trinidad’s south-western peninsula is experiencing rapid erosion. Despite being sheltered from the open ocean, satellite images have shown large portions of it being lost to the Gulf of Paria.
According to the World Bank publication Turn Down the Heat, Earth is locked into at least a 1.5°C rise in temperature compared with pre-industrial times. Rising seas caused by rising temperatures, coupled with projected increases in the intensity and frequency of storms and hurricanes, which also affect wave energy, are expected to accelerate coastal erosion. Such effects are of grave concern for small island developing states (SIDS).
With Trinidad’s east coast sustaining several developing communities, through income from tourism, agriculture and fishing, management of the coastline — which is also a nesting site for endangered leatherback turtles — is of utmost importance.
By Rajiv Jalim