Effects of the Deep Waterway Project on the characteristics of hydrodynamics and sediment dynamics in the North Passage of the Changjiang Estuary

JIANG Chenjuan; LI Jiufa; WU Hualin; FU Gui; LI Weihua; LIU Gaofeng

doi:10.3969/j.issn.0253-4193.2013.04.016

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JIANG Chenjuan, LI Jiufa, WU Hualin, FU Gui, LI Weihua, LIU Gaofeng. Effects of the Deep Waterway Project on the characteristics of hydrodynamics and sediment dynamics in the North Passage of the Changjiang Estuary[J]. Haiyang Xuebao, 2013, 35(4): 129-141. doi: 10.3969/j.issn.0253-4193.2013.04.016

Citation:

JIANG Chenjuan, LI Jiufa, WU Hualin, FU Gui, LI Weihua, LIU Gaofeng. Effects of the Deep Waterway Project on the characteristics of hydrodynamics and sediment dynamics in the North Passage of the Changjiang Estuary[J]. Haiyang Xuebao, 2013, 35(4): 129-141. doi: 10.3969/j.issn.0253-4193.2013.04.016

Citation:

JIANG Chenjuan, LI Jiufa, WU Hualin, FU Gui, LI Weihua, LIU Gaofeng. Effects of the Deep Waterway Project on the characteristics of hydrodynamics and sediment dynamics in the North Passage of the Changjiang Estuary[J]. Haiyang Xuebao, 2013, 35(4): 129-141. doi: 10.3969/j.issn.0253-4193.2013.04.016

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Effects of the Deep Waterway Project on the characteristics of hydrodynamics and sediment dynamics in the North Passage of the Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2013.04.016

1.
The College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China;State Key Lab. of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
State Key Lab. of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
3.
Shanghai Estuarine & Coastal Science Research Center, Shanghai 201201, China
4.
Yangtze Estuary Waterway Administration Bureau, Ministry of Transport of China, Shanghai 200003, China

Received Date: 2012-05-22
Rev Recd Date: 2012-11-18

Abstract

Abstract

To improve navigability of the major access channel into Shanghai Harbor, a large-scale Deep Waterway Project (DWP) was carried out in the North Passage (NP) of the Yangtze Estuary. Training walls, groins and channel dredging directly transformed the natural geometry of the estuary. Besides, the engineering constructions greatly hindered the exchanges of water and sediment between the NP and adjacent bar areas. Changes in the characteristics of hydrodynamics and sediment dynamics were accessed by statistical analysis on the data of flow and suspended sediment concentration (SSC), which were collected simultaneously at several locations along the main channel of the NP prior to and after the engineering works. The results show that the decreased ebb flow diversion from the South Channel and the overbanking flood tidal currents from the Jiuduan Shoal caused an increase in the flood tidal volume and an decrease in the ebb tidal volume in the distributrary inlet and upper reach, while the concentrating of flow into the main channel by the training walls and groins caused an increase in the ebb tidal volume in the lower reach. The analysis on the mechanisms of sediment transport reveals that Euler residual flow, tidal pumping, Stokes effect and vertical-longitudinal circulation are main forcing agents leading to residual sediment transport. Euler residual flow caused seaward transport, while Stokes effect and vertical-longitudinal circulation caused landward transport. Sediment transport due to tidal pumping varied with seasons. During wet seasons, the transports due to Euler residual flow and tidal pumping significantly changed, leading to the change in the along-channel distribution of the net sediment transport in a spring tidal cycle, which suggests an overall sediment accumulation in the middle and lower reach prior to the DWP but accumulation in the upper half of the middle reach after the DWP. During dry seasons, the divergent pattern of sediment transport due to tidal pumping resulted in sediment resuspension in most part of the channel, with sediment accumulation in the distributrary inlet after the DWP.
- the North Passage of the Changjiang Estuary,
- hydrodynamics,
- sediment dynamics,
- mechanisms of water and sediment transport,
- erosion and deposition

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