Modeling of suspended sediment by coupled wave-current model in the Zhujiang (Pearl) River Estuary

LIU Guangping; CAI Shuqun

doi:10.1007/s13131-019-1455-3

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LIU Guangping, CAI Shuqun. Modeling of suspended sediment by coupled wave-current model in the Zhujiang (Pearl) River Estuary[J]. Acta Oceanologica Sinica, 2019, 38(7): 22-35. doi: 10.1007/s13131-019-1455-3

Citation:

LIU Guangping, CAI Shuqun. Modeling of suspended sediment by coupled wave-current model in the Zhujiang (Pearl) River Estuary[J]. Acta Oceanologica Sinica, 2019, 38(7): 22-35. doi: 10.1007/s13131-019-1455-3

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Modeling of suspended sediment by coupled wave-current model in the Zhujiang (Pearl) River Estuary

doi: 10.1007/s13131-019-1455-3

LIU Guangping¹,
CAI Shuqun^2
,

1.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2018-03-01

Abstract

Abstract

A three-dimensional wave-current-sediment coupled numerical model is developed to understand the sediment transport dynamics in the Zhujiang (Pearl) River Estuary (ZRE), China. The model results are in good agreement with observed data, and statistics show good model skill scores. Numerical studies are conducted to assess the scenarios of suspended sediment in the ZRE under the effects of different forcing (river discharges, waves, and winds). The model results indicate that the estuarine gravitational circulation plays an important role in the development of estuarine turbidity maximum in the ZRE, particularly during neap tides. The increased river discharge can result in a seaward sediment transport. The suspended sediment concentration (SSC) in the bottom increases with both wave bottom orbital velocity and wave height. Because of the shallow water depth, the effect of waves on sediment in the west shoal is greater than that in the east channel. The southwesterly wind-induced wave affects the SSC more than those resulting from the northeasterly wind, while the northeasterly wind-driven circulation has a slightly greater influence on the SSC than that of the southwesterly wind. However, a steady southwesterly wind condition favors the increase of the SSC in the Lingding Bay more so than a steady northeasterly wind condition. If the other forcings are same, the averaged SSC under a steady southwesterly wind condition is about 1.1 times that resulting from a steady northeasterly wind.
- sediment transport,
- turbidity,
- Regional Ocean Modeling System (ROMS),
- Zhujiang River Estuary

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