RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2007, Vol. 16 >> Issue (4): 476-476.

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EFFECT OF ZHONGYANG SANDBANK DISPLACEMENT ON STABILITY OF THE SOUTH AND NORTH PASSAGE BIFURCATION OF YANGTZE RIVER ESTUARY

YING Ming, LI Jiufa, YU Zhiying, XU Haigen, YUN Caixing   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-07-21

Abstract:

Zhongyang Sandbank is located on the South and North Passage bifurcation. This section is concentrated with several important projects, such as quay of Shanghai Baosteel Group Corporation and deepwater navigation channel project downstream. Based on topographic maps dating from 1870, utilizing ArcGIS and other GIS software, the paper mainly deals with displacement characters and profile of bifurcation sandbanks including Zhongyang Sandback,Shangliuhe Sandbank and Xinliuhe Sandback and so on. It is found that the evolvement character of Zhongyang Sandbank is “back off  upper shift back off again and so on” circulative evolvement of back off under longterm runoff and going up with accepting bottom sand from upreaches. The area and volume of each sandbank has been calculated, and each channel of the South and North Passage bifurcation has been analyzed. At present, bifurcation is not steady. It is necessary to carry out regulation project as soon as possible in order to stabilize sandbanks and channels and reduce the threat of bottom sand towards downstream.

Key words: the Yangtze River Estuary, Zhongyang Sandbank, calculation of erosion and accumulation, South and North Passage bifurcation, profile

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