2013•Haiyang kexueRequires access
Influences of the Nanshatou Passage and the Hengsha Pas-sage on sediment deposition in deepwater navigation channel of the Changjiang River Estuary
Wei Chen, Kuang Cuiping, Gu Jie, Xin Qin
Open publisher page 2 citations
Abstract
On the basis of the measured data of water depth in the Nanshatou Passage,the Hengsha Passage,and the inlet cross-section of the North Passage and the South Passage,the flow spilt ratios of the North Channel and the South Channel,and the North and the South Passage,the reasons for the sediment deposition in the deepwater navigation channel of the Changjiang River Estuary were analyzed.The sediment deposition in the deepwater navigation channel of the Changjiang River Estuary was affected by multi-factors.Among these factors,the influences of the development of the Nanshatou and the Hengsha Passage were significant.The development of the Nanshatou Passage led to the increase of the ebb flow discharge and scouring of the southern bank of the South Channel,the scoured sediment was carried by the ebb flow to the northern bank of the South Channel,and was silted in the entrance reach of the North Passage,which decreased the ebb flow volume entering the deepwater navigation channel.The development of the Hengsha Passage caused the increase of sediment and water exchange between the South and the North Passage,which weakened the sediment and water exchange between the South Channel and the North Passage,and enhanced the sediment silting in the upper reach of the deepwater navigation channel.The development of the Nanshatou Passage and the Hengsha Passage also caused the scour of the upper reach of the South Passage,which weakened the ebb flow entering the North Passage and further strengthened 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 were also important factors on effect of the deepwater navigation channel.The research results were very meaningful on regulating the sediment deposition in the deepwater navigation channel of the Chang jiang River Estuary.