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HomeAsiaSinking cities: Those in parts of Asia are disappearing fastest, study finds

Sinking cities: Those in parts of Asia are disappearing fastest, study finds

Scientists say coastal cities in South and Southeast Asia are experiencing rapid urbanization and poor control, exacerbating the risks already posed by rising sea levels. sinking more rapidly than

The population of Chittagong, Bangladesh, on the Bay of Bengal, has grown by more than 120% over the past two decades to reach 5.2 million. He’s also one of the fastest sinking cities in the world, according to a new study.

the study, It was published in this week’s magazine natural sustainability, I found it Land is sinking particularly rapidly in coastal cities built in “flat, low-altitude river deltas” where rapid growth and urbanization encourage groundwater and oil extraction.

An international group of scientists led by Singapore’s Nanyang Technological University (NTU) used satellite imagery taken between 2014 and 2020 to identify the world’s most densely populated areas, with a population of at least 5 million. We analyzed high 48 coastal city sunken sites. They found that the median land subsidence rate (the rate at which land subsides) in each of the 48 coastal cities ranged over 16.2 millimeters, or 0.6 inches per year.

Sinking Tuvalu begs the question: are you still a country, even if you are underwater?

“When a lot of water is pulled out of the ground, the sediments are compacted, and since there is less water to hold them, they start to subside, which causes the land to subside,” says an NTU geoscience doctoral student. said Cheryl Tay. First author of the study.

The study also shows some of the cities with the highest land subsidence rates in Indonesia, Myanmar and India. Washington, one of the 48 coastal cities surveyed, has a relatively low rate of land subsidence (0 mm per year on average) and is at low risk of being affected by sea level rise.

The report’s findings also take into account the rate at which sea-level rise may still affect populations further inland through extreme weather events such as typhoons, hurricanes, and floods.

Emma Hill, Professor of Earth Sciences at NTU and one of the report’s authors, said:

The researchers did not investigate the reasons for land subsidence as part of the study’s scope.

Indonesia passes law to move capital from Jakarta to Borneo

Jakarta, one of the fastest sinking cities, To be replaced by Indonesia’s capital After years of rapid growth, congestion and pollution. In January, the Indonesian government passed a law outlining plans to move the capital to a jungle area in East Kalimantan, Borneo. Environmental activists say the decision will spur further deforestation.

“By 2030, most of Jakarta will be uninhabitable,” said Kian Goh, an architect and urban planner who has researched how cities in the United States and Southeast Asia are responding to climate change. The root cause of urban subsidence is lack of development and proper planning.”

Goh said the study helps give readers a “big picture” of which coastal cities are most vulnerable to land subsidence, but it also reveals systemic issues that increase risk in those areas. Said it’s nothing. “Where land subsidence is most intense is often populated by poor people living in settlements dating back to colonial times,” she said. “These are high-risk areas where people suffer the most.”

According to Goh, if a city has enough plumbing and running water, there is no need to dig wells to pump groundwater. “The problem is ultimately due to planning and political issues.”

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