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メコンデルタ 川砂採掘とダム建設で海に沈む

The Mekong Delta: an unsettling portrait of coastal collapse,FT.com,20.1.5

Some environmental disasters present themselves over years; others come with a bang — or a splash.

The latter happened one day last August, when residents of Binh My, a commune in Vietnam’s lush Mekong Delta, heard a loud cracking sound.

They went outside to watch a 25-metre-long chunk of the highway that runs alongside their houses collapse into the river as the asphalt gave way.

One of Asia’s biggest wetlands is subsiding into the sea, the result in part of rising sea levels created by climate change.

But when asked what caused the collapse, a local farmer who gave his name as Mr Bo points to a crane mounted on a boat mid-river — about a kilometre away — that is mining sand. “They are making the bed of the river deeper and deeper,” he says, miming a scooping action.

Researchers monitoring the Mekong say a crisis that has been building on the river for years has turned into a full-blown emergency in recent months. They blame two man-made phenomena: the mining of sand from the riverbed and the building of new dams upriver in Laos and China that are altering the river’s flow, sediment content and even its colour.

Sand excavation along the Mekong, near Vientiane in Laos © Getty Imag

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Author:寿
農業情報研究所(WAPIC)=http://www.juno.dti.ne.jp/~tkitaba/の所長・所員・小使いを兼務。原発事故で「明るい農業・農村」の夢を失った老い先短い老人です。かつての行動派も病魔のために身体不如意、情報提供と批評に徹します。

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