3 years ago

InSAR reveals coastal subsidence in the Pearl River Delta, China


The Pearl River Delta (PRD) is one of the most important economic regions with the highest population densities in China. With its dramatic increasing population and economy, hazards associated with land subsidence frequently occur here that amplify the negative effect of sea level rise. However, land subsidence has not been regularly measured in this region. Here, we use interferometric synthetic aperture radar (InSAR) to investigate the rate and extent of land subsidence in the PRD region. Assuming purely vertical displacements, multi‐track interferograms from different viewing geometries are combined to estimate the linear rate map and time series at a higher resolution in time than is possible with a single track. The results show apparent subsidence along the coastal region of Shenzhen associated with rapid urban development in recent years. The average subsidence rate within 500 m of the coast is about 2.5 mm yr−1, and the maximum is up to about 6 mm yr−1 with respect to the central part of the city. Much of the land surface in the PRD is less than 2 m above mean sea level; high‐precision geodetic measurements throughout the PRD region are therefore critical for conducting risk assessments, considering the rate of about 2–3 mm yr−1 of current global sea level rise.

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-246X.2012.05687.x

DOI: 10.1111/j.1365-246X.2012.05687.x

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.