Indonesian Dumai coastal erosion reaches ‘alarming pace’ due to damaged mangroves

Rizal Harahap, The Jakarta Post 30 Apr 10;

The coast of Dumai in Riau province is facing further coastal erosion due to damage to mangrove swamps, resulting in tides from the Malacca Strait slam against the shore, eroding up to 7 meters of coastline annually.

One of the worst-affected locations is Puak Beach in Teluk Makmur subdistrict in Medang Kampai.

Local community leader M. Nasir Efendi said the land between the coast the main road in the village had receded by more than 250 meters.

“When it was built in 1956, the distance between the road and the coast was around 300 meters, but now, during high tides, seawater reaches some sections of the 5-kilometer road,” Nasir told The Jakarta Post.

He added that residents had repeatedly requested government action to reclaim the coastline to save the village from high tides, but that the local administration had only built a wave barrier.

“What else can we do? The cost of coastal reclamation is too high, but residents still hope a dam will be built along the whole coast,” he said, adding that currently, only on a small stretch of the coast had a dam.

Nasir estimates that Teluk Makmur subdistrict would be washed away in the next 15 years without immediate action.

“If the rate of abrasion is on average 5 meters annually, the sea would reach the village in the next 10 years,” he said.

Dumai Environmental Agency head Zulfa Indra said the pace of coastal erosion in Dumai had reached an alarming level.

Apart from eroding land, he added that the waves could also extend the cliffs along the coast up to two meters inland.

Coastal erosion is not limited to Teluk Makmur subdistrict, he said. The coast along Pelintung Industrial Zone is also undergoing rapid erosion. “A large part of the mangrove swamps that previously served as a coastal barrier have vanished,” he said.

“Changes in land use have caused widespread mangrove forest destruction.

“Mangrove swamps still remain in a number of locations, but they are still young and require special care and supervision,” he added.

Zulfa said his agency faced difficulties curbing the pace of coastal erosion due to limited funds.

Last year, he said, the Dumai city budget allocated only Rp 3 billion (US$330,000) to maintain coastal areas, forcing the agency to postpone coastal barrier projects in a number of locations.

“The available funds won’t cover the length of coast that need to be protected from the waves,” Zulfa said.

He expressed hope that the Dumai municipality would approve the Rp 5 billion budget proposed by his agency for coastal maintenance this year, adding that the funds would be used to continue delayed projects and mangrove reforestation carried out over the past year.

“The budget approval very much determines the pace of mitigation efforts of coastal erosion that has threatened the lives of local people,” he said.

Zulfa said his agency had replanted 10,000 mangrove seedlings in a number of areas prone to coastal erosion, of which only 60 percent would survive, while the rest are expected to die or be swept away by waves.

“Only mature plants can survive the pace of erosion, that’s why we still need maintenance funds for the next several years to ensure the young plants continue to thrive.

“Young mangrove trees cannot mature naturally in current conditions as they could be swept away by waves.

“These young trees are also prone to forest clearing, so they must be tended to and supervised,” he said.

Nasir estimates that Teluk Makmur subdistrict would be washed away in the next 15 years without immediate action.