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Article

A Computationally Efficient Shallow Water Model for Mixed Cohesive and Non-Cohesive Sediment Transport in the Yangtze Estuary

by 1,2,*, 1, 1, 1 and 1
1
Ocean College, Zhejiang University, Zhoushan 316021, China
2
Ocean Research Center of Zhoushan, Zhejiang University, Zhoushan 316021, China
*
Author to whom correspondence should be addressed.
Academic Editor: Alistair Borthwick
Water 2021, 13(10), 1435; https://doi.org/10.3390/w13101435
Received: 5 April 2021 / Revised: 13 May 2021 / Accepted: 14 May 2021 / Published: 20 May 2021
(This article belongs to the Section Oceans and Coastal Zones)
In this paper, a computationally efficient shallow water model is developed for sediment transport in the Yangtze Estuary by considering mixed cohesive and non-cohesive sediment transport. It is firstly shown that the model is capable of reproducing tidal-hydrodynamics in the estuarine region. Secondly, it is demonstrated that the observed temporal variation of suspended sediment concentration (SSC) for mixed cohesive and non-cohesive sediments can be well-captured by the model with calibrated parameters (i.e., critical shear stresses for erosion/deposition, erosion coefficient). Numerical comparative studies indicate that: (1) consideration of multiple sediment fraction (both cohesive and non-cohesive sediments) is important for accurate modeling of SSC in the Yangtze Estuary; (2) the critical shear stress and the erosion coefficient is shown to be site-dependent, for which intensive calibration may be required; and (3) the Deepwater Navigation Channel (DNC) project may lead to enhanced current velocity and thus reduced sediment deposition in the North Passage of the Yangtze Estuary. Finally, the implementation of the hybrid local time step/global maximum time step (LTS/GMaTS) (using LTS to update the hydro-sediment module but using GMaTS to update the morphodynamic module) can lead to a reduction of as high as 90% in the computational cost for the Yangtze Estuary. This advantage, along with its well-demonstrated quantitative accuracy, indicates that the present model should find wide applications in estuarine regions. View Full-Text
Keywords: Yangtze Estuary; mixed cohesive and non-cohesive sediment; shallow water modeling; local time step Yangtze Estuary; mixed cohesive and non-cohesive sediment; shallow water modeling; local time step
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MDPI and ACS Style

Hu, P.; Tao, J.; Ji, A.; Li, W.; He, Z. A Computationally Efficient Shallow Water Model for Mixed Cohesive and Non-Cohesive Sediment Transport in the Yangtze Estuary. Water 2021, 13, 1435. https://doi.org/10.3390/w13101435

AMA Style

Hu P, Tao J, Ji A, Li W, He Z. A Computationally Efficient Shallow Water Model for Mixed Cohesive and Non-Cohesive Sediment Transport in the Yangtze Estuary. Water. 2021; 13(10):1435. https://doi.org/10.3390/w13101435

Chicago/Turabian Style

Hu, Peng, Junyu Tao, Aofei Ji, Wei Li, and Zhiguo He. 2021. "A Computationally Efficient Shallow Water Model for Mixed Cohesive and Non-Cohesive Sediment Transport in the Yangtze Estuary" Water 13, no. 10: 1435. https://doi.org/10.3390/w13101435

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