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

2019 ◽  
Vol 38 (7) ◽  
pp. 22-35 ◽  
Author(s):  
Guangping Liu ◽  
Shuqun Cai
Keyword(s):  
Suspended Sediment ◽  
Current Model ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Coupled Wave

scholarly journals Effects of Wave–Current Interaction on Storm Surge in the Pearl River Estuary: A Case Study of Super Typhoon Mangkhut

2021 ◽  
Vol 8 ◽  
Author(s):  
Zhifa Luo ◽  
Bensheng Huang ◽  
Xiaohong Chen ◽  
Chao Tan ◽  
Jing Qiu ◽  
...  
Keyword(s):  
Storm Surge ◽  
Current Model ◽  
Spring Tide ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Wave Setup ◽  
The Pearl River Estuary ◽  
Super Typhoon ◽  
The Pearl River

This study explored the effects of interactions between waves and current on storm surge in the Pearl River Estuary (PRE) using a fully coupled wave–current model. The model was validated based on in situ observations during the traverse of super typhoon Mangkhut. The results indicated that the model could reproduce the storm surge and wave setup processes. Numerical experiments showed that simulations of storm surge are minimally affected by wave setup. The wave setup during super typhoon Mangkhut reached up to 0.23 m and contributed to the total near shore storm surge by up to 8%. The simulations of the coupled model showed a better correlation with observations compared to those of an uncoupled model. The storm surge increased with transport upstream in a tidal-dominated outlet, whereas it decreased in a river-dominated outlet. The storm surge and wave setup increased and decreased, respectively, during spring tide as compared to that during a neap tide. The storm surge increased with increasing runoff in the upper river reaches, whereas there was little change in the tidal-dominated lower river reaches. This research emphasizes the importance of integrating the effects of multiple dynamic factors in the forecasting of storm surge and provides a reference for similar studies in other estuaries with multiple outlets and a complex river network.

Study on the Characteristics of Temporal and Spatial Variation of Suspended Sediment in the Pearl River Estuary

2009 ◽  
Author(s):  
Wei Zhang ◽  
Mingyuan Yang ◽  
Xiaolin Zhang ◽  
Peipei Dong
Keyword(s):  
Spatial Variation ◽  
Suspended Sediment ◽  
Large Scale ◽  
Research Result ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Tidal Range ◽  
Pearl River ◽  
Temporal And Spatial Variation ◽  
Temporal And Spatial

The Lingding Estuary is one of the main parts of the whole Pearl River Delta, which lies in the South Sea, China. It is about 60 km wide from Hong Kong in the east to Macao in the west and the water areas are approximately 2110 km2. The process of suspended sediment movement is influenced by many factors, such as the estuarine geometry, tidal range and ravine flows etc.. In this paper, large scale hydrological observations in the Lingding Estuary have been respectively carried out in July, 2003. Based on these data, characteristics of temporal and spatial variation of suspended sediment concentration (SSC) in the Lingding Estuary are studied. The research result shows that SSC changes with the variation of tide current and runoff, the sediment re-suspension is often occurred 1–2 hour following the flood or ebb tide. The maximum turbidity appears near the gauging station V3. In the flood dominant stage, the sediments move towards the mainland, while during the ebb sediments move down.

scholarly journals Using Satellite Remote Sensing to Study the Effect of Sand Excavation on the Suspended Sediment in the Hong Kong-Zhuhai-Macau Bridge Region

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 435
Author(s):  
Fenfen Liu ◽  
Tonghui Zhang ◽  
Haibin Ye ◽  
Shilin Tang
Keyword(s):  
Remote Sensing ◽  
Time Series ◽  
Hong Kong ◽  
Suspended Sediment ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
Suspended Sediment Concentrations ◽  
The Pearl River

The Hong Kong-Zhuhai-Macau Bridge crosses the Pearl River Estuary and is the largest bridge and tunnel project in the world. During the construction period of this project, the excessive suspended sediment was found in the construction region. The suspended sediment generated by sand excavation in the upstream was assumed to have a significant impact on the suspended sediment in the tunnel region. In this study, we assessed the impact of upstream sand excavation on the suspended sediment in the Hong Kong-Zhuhai-Macau Bridge construction area using Landsat OLI, ETM+, and TM data. Regional suspended sediment algorithms were developed for Landsat using a symbolic regression method based on data from in situ measurements in the study area from 2003 to 2014. A band shift was conducted on the remote sensing reflectance data from Landsat ETM+ and OLI to produce a time series of the suspended sediment concentrations that was internally consistent with that of the Landsat TM data. The suspended sediment distribution was extracted and used to compare under two different conditions, with and without sand excavation. The correlations of the time series of the suspended sediment concentrations in different regions in the surrounding waters, including the correlations between the construction regions and the sand excavation regions, were calculated. Our results indicated that the sand excavation north of the Pearl River Estuary had a limited impact on the surface suspended sediment concentrations in the Hong Kong-Zhuhai-Macau Bridge tunnel area.

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