| 长江口12.5 m深水航道回淤特征 |
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| 引用本文： | 刘杰,程海峰,赵德招.长江口12.5 m深水航道回淤特征[J].水科学进展,2014,25(3):358-365. |
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| 作者姓名： | 刘杰 程海峰 赵德招 |
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| 作者单位： | 上海河口海岸科学研究中心, 上海 201201 |
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| 基金项目： | 上海市科学技术委员会科研计划项目(12231203103);长江科学院开放研究基金资助项目(CKWV2012304/KY)~~ |
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| 摘 要： | 针对长江口12.5 m深水航道的回淤问题，收集整理了2010—2012年的航道回淤资料和水文测验资料，研究了航道回淤的时空变化特征及其与径流、潮流和含沙量的关系。结果表明:航道回淤呈洪季大、枯季小的年内变化特征，大风骤淤明显；航道回淤沿程主要集中在南港—圆圆沙段和北槽中下段，其回淤量占全航道的80%以上。南港—圆圆沙段回淤的泥沙颗粒以细砂为主，回淤强度与径流的关系不密切，与潮流的关系表现为大潮大、小潮小。北槽航道回淤泥沙颗粒以粉砂为主，回淤部位随径、潮流变化而变化，表现为径流增大，回淤部位下移；潮动力减弱，回淤部位上提。长江口拦门沙水域泥沙的再悬浮，可能是航道淤积最主要的泥沙来源。
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| 关 键 词： | 长江口 北槽 12.5 m深水航道 回淤 |
| 收稿时间： | 2014-01-07 |
Siltation characteristics of the 12.5 m deepwater navigation channel in Yangtze estuary |
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| LIU Jie,CHENG Haifeng,ZHAO Dezhao.Siltation characteristics of the 12.5 m deepwater navigation channel in Yangtze estuary[J].Advances in Water Science,2014,25(3):358-365. |
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| Authors: | LIU Jie CHENG Haifeng ZHAO Dezhao |
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| Institution: | Shanghai Estuarine and Coastal Science Research Center, Shanghai 201201, China |
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| Abstract: | A series of dredging and hydrologic data in situ measurement are collected to study temporal-spatial variation characteristics of siltation, and the dependency relationship of siltation on riverine discharge, tidal range and local suspended sediment concentration in the 12.5 m Deepwater Navigational Channel (DNC) in the Yangtze Estuary.The results show that: ① the quantity of siltation in DNC is much greater in flood season than that in dry season; ② the sedimentation during storms is very serious; ③ the deposited sediments mainly distribute in the South Channel—Yuanyuansha Channel and the middle reach of the North Passage; ④ the grain size of the dredged sediment in the upper reach is greater than that in the lower reach; ⑤ the quantity of siltation in the South Channel—Yuanyuansha Channel is no sensitive to the riverine discharge, but it deposits more during spring-tide and less during neap-tide; ⑥ the central position of the siltation in the North Passage varies with the intensity of discharge, when the discharge becomes small, it move up-estuary, and vice versa; the quantity of siltation in the North Passage will get greater in flood season than in dry season; ⑦ the resuspension of the deposited sediments near the estuarine turbidity maxium area is the main contribution to the siltation in the dredged navigational channel. |
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| Keywords: | Yangtze Estuary north passage 12 5 m deepwater navigational channel siltation |
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