Impact of estuarine reclamation projects on saltwater intrusion and freshwater resource

Hanghang LÜ; Jianrong ZHU; Qing CHEN; Ming LI; Shunqi PAN; Shenliang CHEN

doi:10.1007/s00343-021-1246-z

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Impact of estuarine reclamation projects on saltwater intrusion and freshwater resource

Physics | Updated：2023-04-27

- Impact of estuarine reclamation projects on saltwater intrusion and freshwater resource
- Journal of Oceanology and Limnology Vol. 41, Issue 1, Pages: 38-56(2023)
- Affiliations：
  
  1.CCCC National Engineering Research Center of Dredging Technology and Equipment Co., Ltd., Shanghai 200082, China
  2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  3.Civil Engineering and Industrial Design, School of Engineering, Liverpool University, Liverpool L69 3GH, UK
  4.Hydro-environmental Research Centre, School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
- Author bio：
  
  Jianrong ZHU, E-mail: jrzhu@sklec.ecnu.edu.cn
- Funds：
- DOI：10.1007/s00343-021-1246-z
  CLC：
- Received：06 August 2021，
  
  Accepted：12 November 2021，
  
  Online First：29 December 2021，
  
  Published：2023-01
- Accepted：
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Hanghang LÜ, Jianrong ZHU, Qing CHEN, et al. Impact of estuarine reclamation projects on saltwater intrusion and freshwater resource[J]. Journal of Oceanology and Limnology, 2023, 41(1): 38-56.
DOI：

Hanghang LÜ, Jianrong ZHU, Qing CHEN, et al. Impact of estuarine reclamation projects on saltwater intrusion and freshwater resource[J]. Journal of Oceanology and Limnology, 2023, 41(1): 38-56. DOI： 10.1007/s00343-021-1246-z.

摘要

Abstract

Estuarine projects can change local topography and influence water transport and saltwater intrusion. The Changjiang (Yangtze) River estuary is a multichannel estuary

and four major reclamation projects have been implemented in the Changjiang River estuary in recent years: the Xincun Shoal reclamation project (RP-XCS)

the Qingcao Shoal reclamation project (RP-QCS)

the Eastern Hengsha Shoal reclamation project (RP-EHS)

and the Nanhui Shoal reclamation project (RP-NHS). The effects of the four reclamation projects and each project on the saltwater intrusion and water resources in the Changjiang River estuary were simulated in a 3D numerical model. Results show that for a multichannel estuary

local reclamation projects change the local topography and water diversion ratio (WDR) between channels and influence water and salt transport and freshwater utilization in the estuary. During spring tide

under the cumulative effect of the four reclamation projects

the salinity decreases by approximately 0.5 in the upper reaches of the North Branch and increases by 0.5–1.0 in the middle and lower reaches of the North Branch. In the North Channel

the salinity decreases by approximately 0.5. In the North Passage

the salinity increases by 0.5–1.0. In the South Passage

the salinity increases by approximately 0.5 in the upper reaches and decreases by 0.2–0.5 on the north side of the middle and lower reaches. During neap tide

the cumulative effects of the four reclamation projects and the individual projects are similar to those during spring tide

but there are some differences. The effects of an individual reclamation project on WDR and saltwater intrusion during spring and neap tides are simulated and analyzed in detail. The cumulative effect of the four reclamation projects favors freshwater usage in the Changjiang River estuary.

关键词

Keywords

references

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