Long-term sea-level changes in Hong Kong from tide-gauge records

Xiaoli Ding, J. Chao, D. Zheng, Y. Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

Over four decades of tide-gauge data and leveling measurements collected at two tide-gauge stations in Hong Kong are analyzed to study the long-term tendency and the frequency features in the sea-level changes in the region. The results show that there has been a long-term sea-level rise of 1.9 mm per year and a land subsidence of over 4 mm per year at the tide-gauge stations. The variations in sea-level from seasonal through to decadal time scales are detected by using the time-frequency spectrum of wavelet transform. The annual, semiannual and the 18.6-year variations are most significant and exhibit stable periodicity. The local atmospheric pressure variations mainly influence the annual sea-level change and the effect amounts to 33% of the magnitude calculated before the inverted barometer corrections are applied. It is also projected from the extrapolation of the current trends of sea-level rise and ground subsidence that the absolute and relative mean sea-levels in Hong Kong may further rise by 10 cm and 30 cm respectively by the middle of the next century. The possible maximum relative mean sea-level change, when considering the various temporal variations, can be as high as 50 cm in the next half century.
Original languageEnglish
Pages (from-to)749-754
Number of pages6
JournalJournal of Coastal Research
Volume17
Issue number3
Publication statusPublished - 1 Jan 2001

Keywords

  • Atmospheric pressure
  • Land subsidence
  • Sea-level change
  • Wavelet transform

ASJC Scopus subject areas

  • Ecology
  • Water Science and Technology
  • Earth-Surface Processes

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