Numerical Analysis on Impacts of the Project of North Branch Narrowing on Sediment Distribution at the North Branch in the Changjiang River Estuary

2020 ◽  
pp. 743-753
Author(s):  
Guo Chuansheng ◽  
Tang Liqun ◽  
Wang Chonghao ◽  
Zhao Huiming ◽  
Wang Yuhai ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
River Estuary ◽  
Changjiang River ◽  
Changjiang River Estuary ◽  
Sediment Distribution ◽  
The Changjiang River ◽  
The North ◽  
The Changjiang River Estuary

Simulation to Investigate the Reasons for the Sediment Deposition in the Upper Reach of the Deepwater Navigation Channel in the Changjiang River Estuary

2012 ◽  
Vol 610-613 ◽  
pp. 1237-1241
Author(s):  
Jie Gu ◽  
Wei Chen ◽  
Xin Qin ◽  
Dan Qing Ma ◽  
Xiao Li Wang ◽  
...  
Keyword(s):  
River Estuary ◽  
Sediment Deposition ◽  
Changjiang River ◽  
Changjiang River Estuary ◽  
The Changjiang River ◽  
The North ◽  
Velocity Magnitude ◽  
Navigation Channel ◽  
The Changjiang River Estuary ◽  
Set Up

At present, the upper reach of the Deepwater Navigation Channel is silted heavily, which brings negative influences on navigation. A two-dimensional numerical model is set up to simulate the hydrodynamics of the Changjiang River Estuary with Delft3D-FLOW in this paper. This model has been validated with the observed tidal level, flow velocity magnitude and direction, and the computed results agree well with the observed data, which also shows the model can well simulate the hydrodynamics of the Changjiang River Estuary caused by the Deepwater Navigation Channel Project. Based on the analysis of computed results, especially the velocity along the South Passage and North Passage, the flood and ebb flow in the Hengsha Passage, and the flow spilt ratio of South Passage and North Passage, it presents that one fundamental reason for the sediment deposition in the upper reach of the Deepwater Navigation Channel is that the velocity along the North Passage is far less than that along South Passage, above all, the velocity in North Passage upstream of the Hengsha Passage is even smaller; another reason is that the flood and ebb flow of Hengsha Passage are large, which weakens the water exchange between the North Passage and South Channel.

Circulation and mixing along the North Passage in the Changjiang River estuary, China

2015 ◽  
Vol 148 ◽  
pp. 213-235 ◽  
Author(s):  
Xiang Pu ◽  
John Z. Shi ◽  
Guo-Dong Hu ◽  
Long-Bing Xiong
Keyword(s):  
River Estuary ◽  
Changjiang River ◽  
Changjiang River Estuary ◽  
The Changjiang River ◽  
The North ◽  
The Changjiang River Estuary

Influence of Hengsha Passage on Sediment Deposition in the Upper Reach of the Deepwater Navigation Channel in the Changjiang River Estuary

2011 ◽  
Vol 255-260 ◽  
pp. 3524-3529
Author(s):  
Jie Gu ◽  
Wei Chen ◽  
Cui Ping Kuang ◽  
Xin Qin ◽  
Dan Qing Ma
Keyword(s):  
Water Exchange ◽  
River Estuary ◽  
Sediment Deposition ◽  
Changjiang River ◽  
Changjiang River Estuary ◽  
The South ◽  
The Changjiang River ◽  
The North ◽  
Navigation Channel ◽  
The Changjiang River Estuary

Based on the data of water depth in the South Branch and the Hengsha Passage, and the flow spilt ratio of the North Passage and the South Passage, the reasons for the sediment deposition in the upper reach of the Deepwater Navigation Channel in the Changjiang River Estuary are explored. The study shows the influence of the development of the Hengsha Passage is significant. The development of Hengsha Passage causes the increase of sediment and water exchange between the North Channel and the North Passage, which weakens the sediment and water exchange between the North Channel and the North Passage, and enhances the sediment silting in the upper reach of the Deepwater Navigation Channel. The development of Hengsha Passage also causes the scour of the upper reach of the South Passage, which weakens the ebb tide entering into the North Passage and further strengthens the sediment deposition in the upper reach of the Deepwater Navigation Channel. On the other hand, the Coriolis force and V-shaped diversion dike at the head of the Deepwater Navigation Channel also contribute the sediment deposition in the upper reach of the Deepwater Navigation Channel.

Numerical Analysis of the Influence of Saltwater Intrusion on Qingcaosha Reservoir

2012 ◽  
Vol 212-213 ◽  
pp. 216-220
Author(s):  
Jie Gu ◽  
Ji Zhong Yang ◽  
Wei Chen ◽  
Xin Qin ◽  
Dan Qing Ma ◽  
...  
Keyword(s):  
Water Intake ◽  
Saltwater Intrusion ◽  
Saline Water ◽  
Spring Tide ◽  
River Estuary ◽  
Changjiang River ◽  
Changjiang River Estuary ◽  
The Changjiang River ◽  
The North ◽  
The Changjiang River Estuary

A 2D hydrodynamics and salinity numerical model for the Changjiang River Estuary was set up by using Delft3D-Flow. The calculation results agree well with the real measured data, which indicates the model can be used to analyze the salinity in the Changjiang River Estuary. The calculated results of saltwater intrusion in the dry season of dry year shows that the main influence style of the salinity on the water intake of the Qingcaosha reservoir is the saltwater spilling over it from the North Branch during the neap tide and the saltwater intrusion from the open sea through the South Branch during the spring tide. The saltwater spilling over from the North Branch forms a saline water mass near the Xinjian sluice during the late period of a spring tide, which takes 5 days to reach the water intake of the Qingcaosha Reservoir.

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