| Morphological Evolution and Its Response to the Navigational Improvements in the North Passage,Yangtze Estuary |
| |
| 作者姓名： | 刘杰 陈吉余 徐志扬 乐嘉海 |
| |
| 作者单位： | State Key Laboratory of Estuarine and Coastal Research East China Normal University，State Key Laboratory of Estuarine and Coastal Research，East China Normal University，Shanghai Estuarine and Coastal Science Research Center，Shanghai Estuarine and Coastal Science Research Center，Shanghai 200062，China，Shanghai Estuarine and Coastal Science Research Center，Shanghai 201201，China，Shanghai 200062，China，Shanghai 201201，China，Shanghai 201201，China |
| |
| 基金项目： | The workis supported bythe Open Foundation of State Key Laboratory of Hydrology-Water Resources，Hydraulic Engineering,Hohai University(Grant No.2005409111) |
| |
| 摘 要： | By use of bathymetric chart,recent change of the riverbed in the North Passage of the Yangtze Estuary has been studied in this paper.The main channel of the upper,middle and lower(section)in the North Passage has been successively eroded and its groin field significantly deposited.At the same time,sediment has been deposited on the entrance region.Erosion and deposition had responded rapidly to the construction of the regulation engineering.There was about one year duration of lagging between erosion in the deep channel and the construction of the regulation engineering.The siltation lag of time in the groin field varied with the initial depth,but the average deposited thickness was about 0.5 m per year.Volumetric analysis demonstrates that there is a increasing trend of siltation in the North Passage after 2002,because of the difference in duration and quantity between erosion in the deep channel and deposition in the groin field.The water volume of the North Passage was reduced by ≈9%(280 million m3)between 2002 and 2006.Sediment budget reveals that the main sediment deposited in the North Passage takes its source from the river and the ocean.The decreasing water volume was attributable to shoaling in the groin field.Its triggering factors for increased sedimentation are the navigational improvements(jetties and groins)after 1998,which altered the passage boundary and destroyed the equilibrium state on the average ebb and flood sediment fluxes.The establishment of a stable estuary is attributed to a reduction in depth of the groin field.The forecast on the sediment deposition quantity and continuous infilling time in the groin system is about 325×106m3 and 6～7 years,respectively.
|
| 关 键 词： | 扬子江 探测技术 海洋 波浪 |
Morphological Evolution and Its Response to the Navigational Improvements in the North Passage, Yangtze Estuary |
| |
| LIU Jie,CHEN Ji-yu,XU Zhi-yang,LE Jia-hai.Morphological Evolution and Its Response to the Navigational Improvements in the North Passage,Yangtze Estuary[J].China Ocean Engineering,2007,21(4):611-624. |
| |
| Authors: | LIU Jie CHEN Ji-yu XU Zhi-yang LE Jia-hai |
| |
| Institution: | [1]State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China [2]Shanghai Estuarine and Coastal Science Research Center, Shanghai 201201, China |
| |
| Abstract: | |
| |
| Keywords: | Yangtze Estuary North Passage navigational improvements bathymetric data |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《中国海洋工程》浏览原始摘要信息 |
| 点击此处可从《中国海洋工程》下载免费的PDF全文 |
