Impacts of coastal reclamation on tidal and sediment dynamics in the Rui’an coast of China

Ocean Dynamics volume 71, pages323–341(2021)Cite this article

Abstract

Coastal reclamation projects have been extensively constructed along the coastline of the East China Sea over the past decades. To investigate the impact of reclamations on the Rui’an coastal zone, regional tidal and sediment dynamics were studied by combining field data and numerical modeling. Field data of tidal elevation and currents, suspended sediment concentration (SSC), and bottom erosion were obtained during both spring and neap tides from 2014 to 2019. Data analysis suggested that the reclamation and construction of the dike reduced the currents in the tidal flat and subsequently reduced the SSC values. The sediment was mainly deposited in the tidal flat after construction. The largest annual deposition rate was approximately 1 m, occurring in the southern part near the dike, while the deposition rate was only 0.08 m/a in the middle part of the tidal flat. In addition, the results of the numerical experiment proved that the reclamation and dike construction contributed to the variations in currents and SSC, thus altering the deposition in the tidal flat. It is suggested that the construction of coastal works and social facilities in macro-turbid coastal zones, such as the Rui’an coast, require the evaluation of possible impact on sediment dynamics.

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Funding

This research was financially supported by the National Key Research and Development Program of China (2020YFD0900803), National Natural Science Foundation of China (11672267, 41976157), Zhejiang Provincial Natural Science Foundation of China (2020C03012, U1709204), and the Fundamental Research Funds for the Central Universities.

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Affiliations

  1. Ocean College, Zhejiang University, Zhoushan, 316021, China

    Peixiong Chen, Zhilin Sun, Yuezhang Xia, Li Li, Zhiguo He & Haijian Xie

  2. The Second Institute of Oceanography, Ministry of Natural Recourses of People’s Republic of China, Hangzhou, 310058, China

    Peixiong Chen, Xin Zhou & Rusheng Wang

  3. Engineering Research Center of Oceanic Sensing Technology and Equipment, Zhejiang University, Ministry of Education, Zhoushan, China

    Zhilin Sun, Yuezhang Xia, Li Li & Zhiguo He

Authors
  1. Peixiong Chen
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  2. Zhilin Sun
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  3. Xin Zhou
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  4. Yuezhang Xia
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  5. Li Li
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  6. Zhiguo He
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  7. Rusheng Wang
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  8. Haijian Xie
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Correspondence to Xin Zhou or Yuezhang Xia.

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Responsible Editor: Guoping Gao

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Chen, P., Sun, Z., Zhou, X. et al. Impacts of coastal reclamation on tidal and sediment dynamics in the Rui’an coast of China. Ocean Dynamics 71, 323–341 (2021). https://doi.org/10.1007/s10236-021-01442-3

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Keywords

  • Hydro-sediment dynamics
  • Topography changes
  • Muddy tidal flat
  • Macro-tides