Numerical simulation on the process of saltwater intrusion and its impact on the suspended sediment concentration in the Changjiang (Yangtze) estuary

Chongguang Pang; Enbao Zhao; Yang Yang

doi:10.1007/s00343-010-9254-4

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Numerical simulation on the process of saltwater intrusion and its impact on the suspended sediment concentration in the Changjiang (Yangtze) estuary

Updated：2023-05-16

- Numerical simulation on the process of saltwater intrusion and its impact on the suspended sediment concentration in the Changjiang (Yangtze) estuary
- Journal of Oceanology and Limnology Vol. 28, Issue 3, Pages: 609-619(2010)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. Shanghai Institute of Waterways
  3. Graduate School of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9254-4
  CLC：
- Online First：20 May 2010，
  
  Published：2010
- Accepted：
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Pang, C., Zhao, E. & Yang, Y. Numerical simulation on the process of saltwater intrusion and its impact on the suspended sediment concentration in the Changjiang (Yangtze) estuary., Chin. J. Ocean. Limnol. 28, 609–619 (2010). https://doi.org/10.1007/s00343-010-9254-4
DOI：

Pang, C., Zhao, E. & Yang, Y. Numerical simulation on the process of saltwater intrusion and its impact on the suspended sediment concentration in the Changjiang (Yangtze) estuary., Chin. J. Ocean. Limnol. 28, 609–619 (2010). https://doi.org/10.1007/s00343-010-9254-4 DOI：

摘要

Abstract

To study the relationship between sediment transportation and saltwater intrusion in the Changjiang (Yangtze) estuary

a three-dimensional numerical model for temperature

salinity

velocity field

and suspended sediment concentration was established based on the ECOMSED model. Using this model

sediment transportation in the flood season of 2005 was simulated for the Changjiang estuary. A comparison between simulated results and observation data for the tidal level

flow velocity and direction

salinity and suspended sediment concentration indicated that they were consistent in overall. Based on model verification

the simulation of saltwater intrusion and its effect on sediment in the Changjiang estuary was analyzed in detail. The saltwater intrusion in the estuary including the formation

evolution

and disappearance of saltwater wedge and the induced vertical circulation were reproduced

and the crucial impact of the wedge on cohesive and non-cohesive suspended sediment distribution and transportation were successfully simulated. The result shows that near the salinity front

the simulated concentrations of both cohesive and non-cohesive suspended sediment at the surface layer had a strong relationship with the simulated velocity

especially when considering a 1-hour lag. However

in the bottom layer

there was no obvious correlation between them

because the saltwater wedge and its inducing vertical circulation may have resuspended loose sediment on the bed

thus forming a high-concentration area near the bottom even if the velocity near the bottom was very low during the transition phase from flood to ebb.

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references

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