Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (3): 305-312.doi: 10.11821/xb201103002

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Morphological Evolution of Mouth Bars of the Yangtze Estuarine Waterways in the Last 100 Years

HE Yufang, CHENG Heqin, CHEN Jiyu   

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  • Received:2010-08-19 Revised:2010-10-16 Online:2011-03-20 Published:2011-03-20
  • Supported by:

    The National Natural Science Funds, No.40776056; Research Subject of Shanghai Association for Science & Technology, No.10dz1210600; Fund from the Ministry of Science and Technology of China for the State Key Laboratory of Estuarine and Coastal Research, No.2008KYYW01

Abstract: The mouth bar in the Yangtze estuarine waterways has significant influences on the transportation of the estuary, flood discharge and the construction of Shanghai Port. In this paper the morphological evolution and its mechanisms of mouth bars of the Yangtze estuarine waterways are studied by analyzing hundreds of years of historical data and the latest profile maps of some main mouth bar channels in the Yangtze Estuary. The results are shown as follows: The mouth bars in North Branch move gradually from outside of the mouth to inside and form a huge sand bar. In North Channel, the top of mouth bar migrates down-stream about 30 kilometers, and a channel bar has been developing since 2001. Two mouth bar tops had ever exited in North Passage, which disappeared in 2010. The top of mouth bar in South Passage migrates to down-stream about 14 kilometers and the number of tops increases at first and then reduces to only one now. According to these analysis results, we can conclude that the evolution of mouth bar differs from that of the location. In North Branch it is directly related to large reclamation in Chongming Island, but in North Passage it has a close relationship with the Yangtze Estuary Deepwater Channel Regulation. However, the evolution of mouth bar in North Channel and South Passage is not only in connection with the Yangtze Estuary Deepwater Channel Regulation, but also with the reclamation in East Hengsha Shoal and the Qingcaosha Reservoir.

Key words: the Yangtze Estuary, mouth bar, inside sand bars, water-depth of shoal top, channel bar, regulation of estuary