RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (05): 698-705.doi: 10.11870/cjlyzyyhj201705006

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PRELIMINARY STUDY ON THE PROGRADATION RATE OF THE EASTERN PART OF CHONGMING ISLAND IN RECENT SIX DECADES

YAO Zhen-xing, CHEN Qing-qiang, YANG Qin-chuan   

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  • Received:2016-09-23 Revised:2016-12-19 Online:2017-05-20
  • Supported by:
    National Nature Sciences Foundation of China(41471161)

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Abstract: Chongming Island is the largest estuary alluvial island in China. Its formation and development relate closely with the fluxes of water and sediment from the Yangtze River. There are records of reclamation or embankment in the Chongming Island in history. According to main seawalls constructed in the eastern part of Chongming Island during the last 60 years, the progradation rates along four transects in northeast, east and southeast directions respectively, and siltation area between seawalls of the eastern part of Chongming Island are calculated. The results showed that:(1) in the last 60 years, the progradation rate of the eastern part of Chongming Island was about 200 m/yr, and the average annual increasing rate of siltation area was 2.80 km2/a; (2) there were differences between the different transects in terms of progradation rate, and the progradation rate in the east was faster than that along every other transect; (3) there were differences in progradation rate for each transect in different time spans. Of all transects, the progradation rate in the 1990s was greater than those in other time spans. The trend of progradation of the eastern part of Chongming Island was coincident with that of variation of the annual sediment discharge from the Yangtze River from the 1950s to the 1980s. There was a difference between both trends for the heavy reclamation period in the 1990s. It is still rare to study the shoreline changes through the seawall. The method can provide a reference for studying the shoreline changes in long time scale.

Key words: the eastern part of Chongming Island, seawall, the progradation rate, fluxes of water and sediment from the Yangtze River, reclamation

CLC Number: 

  • P736.21
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