Preliminary analysis of typhoon-induced sudden sedimentation in navigation channel in Yangtze Estuary over last decade

Typhoon-induced sudden sedimentation in navigation channels is a threat to the safe operation of the Yangtze Estuary waterway and the development of Shanghai International Shipping Center to some extents.Based on the measured field data,the characteristics and law of typhoon-induced sudden sedimentation in navigation channels of the North Passage in recent 10 years are analyzed,the main factors and internal mechanism of sudden sedimentation in the waterways are discussed,and some suggestions of sudden sedimentation prevention are made.The study shows that the amount of sudden sedimentation caused by typhoons is between two and eight million m3 a year,its contribution to the total annual channel deposition ranges from 4% to 50%,and the sudden deposition intensity by typhoons is strengthened with an increase of the navigation channel water depth.The sudden sedimentation distribution in the North Passage waterway is relatively concentrated in time and space.The analysis also shows that the typhoon-induced sudden sedimentation in the North Passage adapts to the changes of water,sediment and bed deformation caused by the Yangtze Estuary Deepwater Channel Regulation Project,while the large amount of sudden sedimentation also has to do with the increase of sediment sources during the typhoon in the Yangtze Estuary.