Chinese Cities Face Sinking Risk Due to Development and Groundwater Use

Recent satellite data underscores a growing environmental challenge for China: significant land subsidence threatening urban areas. According to a study in the journal Science, about 16% of major Chinese cities are experiencing an annual elevation loss exceeding 10 millimeters, with nearly half of the cities losing more than 3 millimeters each year.

Source: Vox/YouTube

This issue is primarily driven by urban development and extensive groundwater extraction. The weight of buildings and infrastructure, coupled with the removal of water, oil, and coal from beneath the cities, is causing the ground to compact or collapse. Cities like Beijing and Tianjin are among the fastest sinking, with dramatic incidents like sudden street fissures leading to the evacuation of thousands.

The study, using advanced radar data from satellites, highlights that in 100 years, a quarter of China’s urban coastal land could be below sea level due to the combined effects of subsidence and sea level rise. This prognosis presents a stark challenge, considering global sea level projections.

Experts like Robert Nicholls, a climate scientist at the University of East Anglia, stress that subsidence exacerbates the risks associated with sea level rise, yet it has not been as thoroughly studied or included in climate adaptation strategies. The study’s authors advocate for reducing groundwater extraction as a critical response, pointing to Shanghai’s slower subsidence rate as a result of such measures.

Internationally, similar patterns of subsidence are observed, indicating a global issue that transcends national borders. Effective management strategies, such as Tokyo and Osaka’s groundwater regulation and managed recharge techniques, have shown promise in stabilizing subsidence.

This environmental dilemma requires both local and global attention to mitigate the risks and adapt urban planning and resilience strategies accordingly. The ongoing study and monitoring of subsidence, alongside aggressive policy responses, are essential to safeguarding the future of China’s expansive urban landscapes.

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