| Study of back-silting strength in the north passage channel of Changjiang Estuary |
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| 作者姓名： | MA Gangfeng LIU Shuguang QI Dingman |
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| 作者单位： | MA Gangfeng1，2，LIU Shuguang1，QI Dingman21. Harbor，Waterway and Coast Engineering，Tongji University，Shanghai 200092，China2. Estuarine and Coastal Scientific Research Institute，Ministry of Communications，Shanghai 201201，China |
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| 摘 要： | Temporal and spatial variations of the back-silting strength in the north passage channel of Changjiang Estuary are investigated using the empirical orthogonal function (EOF) method, with the aim to determine the imposed processes and time-scales. Data on back-silting quantity in every dredging unit of the channel have been collected since March 2000, predominantly once 15 d. The EOF analysis of the back-silting strength reveals two significant modes, which totally explain 58.33% of the overall variance, and the corresponding processes and time-scales. The first EOF mode shows a clear annual cycle which is determined by the riverine water and sediment discharge from the upstream. The second EOF mode reveals a close relation between the back-silting strength and project activities. Because the processes are greatly interrelated in this study case, the other EOF modes accounting for 41.67% of the total variance do not show clear processes and time-scales.
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| 关 键 词： | 长江入海口 北部水道 回淤长度 淤积 河口湾 |
| 收稿时间： | 2006-09-08 |
| 修稿时间： | 2006-12-05 |
Study of back-silting strength in the north passage channel of Changjiang Estuary |
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| MA Gangfeng,LIU Shuguang,QI Dingman.Study of back-silting strength in the north passage channel of Changjiang Estuary[J].Acta Oceanologica Sinica,2007,26(2):56-64. |
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| Authors: | MA Gangfeng LIU Shuguang and QI Dingman |
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| Institution: | 1.Harbor, Waterway and Coast Engineering, Tongji University, Shanghai 200092, China;Estuarine and Coastal Scientific Research Institute, Ministry of Communications, Shanghai 201201, China2.Harbor, Waterway and Coast Engineering, Tongji University, Shanghai 200092, China3.Estuarine and Coastal Scientific Research Institute, Ministry of Communications, Shanghai 201201, China |
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| Abstract: | Temporal and spatial variations of the back-silting strength in the north passage channel of Changjiang Estuary are investigated using the empirical orthogonal function (EOF) method, with the aim to determine the imposed processes and time-scales. Data on back-silting quantity in every dredging unit of the channel have been collected since March 2000, predominantly once 15 d. The EOF analysis of the back-silting strength reveals two significant modes, which totally explain 58.33% of the overall variance, and the corresponding processes and time-scales. The first EOF mode shows a clear annual cycle which is determined by the riverine water and sediment discharge from the upstream. The second EOF mode reveals a close relation between the back-silting strength and project activities. Because the processes are greatly interrelated in this study case, the other EOF modes accounting for 41.67% of the total variance do not show clear processes and time-scales. |
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| Keywords: | empirical orthogonal function (EOF) Changjiang Estuary back-silting strength |
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