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Morphological evolution of mouth bars on the Yangtze estuarine waterways in the last 100 years

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Abstract

The mouth bar in the Yangtze estuarine waterways has a significant influence on navigational transport within the estuary, flood discharge and construction of the Shanghai Port. In this paper the morphological evolution and mechanisms of mouth bar formation of the Yangtze estuarine waterways are studied by analyzing hundreds of years of historical data and the latest profile maps of some or the main mouth bar channels in the Yangtze Estuary. The results are shown as follows: The mouth bars in the North Branch have moved gradually from outside the mouth to the inside and formed a huge sand bar. In the North Channel, the head of the mouth bar has migrated about 30 kilometers downstream, and a channel bar has been developing since 2001. Two mouth bar tops, which always existed in the North Passage, disappeared in 2010. The head of the mouth bar in the South Passage has migrated downstream about 14 km and the number of tops increased at first but is reduced to only one now. According to the results, we can conclude that the evolution of the mouth bars differs depending on their location. In the North Branch it is directly related to large-scale reclamation in Chongming Island, but in the North Passage it has a close relationship with regulation of the Yangtze Estuary Deepwater Channel. However, the evolution of mouth bars in the North Channel and South Passage is not only connected with the Yangtze Estuary Deepwater Channel Regulation Project, but also with the reclamation in the East Hengsha Shoal and the closure of the Qingcaosha Reservoir.

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Authors and Affiliations

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China

    Yufang He, Heqin Cheng & Jiyu Chen

  2. The Second Design and Research Institute of Water Conservancy and Hydropower of Hebei Province, Shijiazhuang, 050021, China

    Yufang He

Authors
  1. Yufang He
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  2. Heqin Cheng
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  3. Jiyu Chen
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Correspondence to Heqin Cheng.

Additional information

Foundation: National Natural Science Foundation of China, 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

Author: He Yufang, Master of Engineering, specialized in harbour, coastal and offshore engineering.

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He, Y., Cheng, H. & Chen, J. Morphological evolution of mouth bars on the Yangtze estuarine waterways in the last 100 years. J. Geogr. Sci. 23, 219–230 (2013). https://doi.org/10.1007/s11442-013-1005-y

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  • DOI: https://doi.org/10.1007/s11442-013-1005-y

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