长江口南北槽分流口洪季水沙变化过程研究

林益帆; 戴志军; 李为华; 谢华亮; 李九发

doi:10.3969/j.issn.0253-4193.2015.03.012

长江口南北槽分流口洪季水沙变化过程研究

doi: 10.3969/j.issn.0253-4193.2015.03.012

1.
华东师范大学河口海岸学国家重点实验室, 上海 200062;
2.
上海河口海岸科学研究中心, 上海 201201

基金项目: 国家自然科学基金(41306085,48505350);国家自然科学重点基金(50939003);新世纪优秀人才计划资助(NCET-12-0182)。

计量
- 文章访问数: 1605
- HTML全文浏览量: 18
- PDF下载量: 1195
- 被引次数: 0
出版历程
- 收稿日期: 2014-01-07

Changes in water and sediment of the bifurcation mouth between the North and South Passage during the flood season,Yangtze Estuary

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
2.
Shanghai Estuarine & Coastal Science Research Center, Shanghai 201201, China

摘要

摘要: 河口分流口的水沙变化过程是影响河口三角洲发育的核心环节,对下游河势的稳定起着关键性的作用。本文通过对北槽二、三期工程前后的南北槽分流口河段洪季大潮期间的同步水沙观测数据进行分析,以探讨长江口深水航道工程整治对分流口水沙过程的影响。结果表明:(1)北槽二期工程到三期工程后,分流口洪季以落潮优势流、优势沙为主的格局基本没有发生改变,但南槽优势流、优势沙出现略有变大,而北槽略有变小现象;(2)分流口洪季的水体输移主要受控于欧拉余流的变化,除北槽入口段水体净输移量一直较小外,其他河段在二、三期工程实施期间均有大幅提升,其中斯托克斯余流变化不大,拉格朗日余流与欧拉余流变化相一致,南槽呈波动状上升,北槽先增后减;(3)在二期到三期工程期间,北槽分流比明显减小,入口段落潮流速减小,含沙量较高,水体输移量降低,输沙强度减弱,由此导致二期工程以来北槽入口河段淤积强度加重。
- 水动力 /
- 悬沙 /
- 机制分解 /
- 南北槽分流口 /
- 长江口
Abstract: The water and sediment change of the bifurcation mouth is one of the key parts to influence the estuarine delta formation,which is a determinative controlled factor on the stability of the downstream river situations. Here,based on the flood season water and sediment data observed synchronously in the bifurcation mouth between North and South Passage (BMNSP) during the operations of the second and third phases of the Deep Water Channel Project (DWCP) in the Yangtze Estuary,impacts of DWCP on hydrodynamics and sediment dynamics of the BMNSP were discussed. The results can be summarized as follows: (1) There had been almost no changes for the situation of both the ebb flow and ebb sediment dominance located at the BMNSP,even though the operations of DWCP had experienced time span from the second to the post-third phase. However,the coefficients of both the ebb flow and ebb sediment dominance of the upstream mouth in the South Passage showed an obvious change from low values in the second DWCP to high values in the third DWCP during the flood season. The corresponding coefficients of both the ebb flow and ebb sediment dominance in the North Passage showed inverse changes comparing with those in the South Passage. (2) The Euler residual flow in the flood season could directly determine the flow transport of the BMNSP. During the second and third phase of the DWCP,average transport discharge of the BMNSP was enhanced except the upstream of the North Passage where the average transport discharge still remained low. The change of the Lagrange residual flow of the BMNSP was similar to that of the Euler residual flow. However,the Stokes residual flow of the BMNSP has remained minor changes. (3) Due to the decreased ebb current velocities,increased suspended sediment concentrations,decreased flow transportation and weaken sediment transport rate of the upstream mouth of the North Passage from the second to the post-third DWCP,it could be the main reasons to induce the aggravation of accretions in the upstream mouth of the North Passage.
- hydrodynamics /
- suspended sediment /
- mechanism decomposed analysis /
- bifurcation of North and South Passage /
- Changjiang (Yangtze) Estuary

HTML全文

参考文献(32)

Syvitski J P M, Kettner A J, Correggiari A, et al. Distributary channels and their impact on sediment dispersal[J]. Marine Geology, 2005(222-223): 75-94.

Dai Zhijun, Liu J T, Wei Wei, et al. Detection of the Three Gorges Dam influence on the Changjiang (Yangtze River) submerged delta[J]. Scientific Reports,2014,4, 6600, doi: 10.1038/srep06600

Slingerland R, Smith N D. River avulsions and their deposits[J]. Annual Review of Earth and Planetary Science, 2004, 32: 257-285.

Edmonds D A, Slingerland R L. Mechanics of river mouth bar formation: implications for the morphodynamics of delta distributary networks[J]. Journal of Geophysical Research: Earth Surface (2003-2012), 2007, 112(F2).

Stouthamer E, Berendsen H J A. Avulsion: the relative roles of autogenic and allogenic processes[J]. Sedimentary Geology, 2007, 198(3): 309-325.

陈吉余.中国河口海岸研究与实践[M]. 北京: 高等教育出版社,2007. Chen Jiyu. Research and practice of Estuary and coast in china[M]. Beijing: Higher Education Press, 2007.

交通运输部长江口航道管理局.长江口深水航道治理三期工程交工验收会议专题报告. 2010. The Yangtze estuary waterway administration bureau of Ministry of Transport. Special reports of the acceptance meeting about the 3rd phase of Yangtze Estuary deepwater channel regulation project [R]. 2010.

刘杰.长江口深水航道河床演变与航道回淤研究 [D]. 上海: 华东师范大学,2008. Liu Jie. Study on morphological evolution and siltation in deep waterway due to channel re-construction in the North Passage, Yangtze Estuary [D]. Shanghai: East China Normal University, 2008.

刘杰,徐志杨,赵德招,等. 长江口深水航道(一二期工程)回淤变化[J]. 泥沙研究,2009(02): 22-28. Liu Jie, Xu Zhiyang, Zhao Dezhao, et al. Change of re-siltation in the Yangtze Estuary deep water channel during 1st and 2nd stages[J]. Journal of Sediment Research, 2009(02): 22-28.

谈泽炜,范期锦,郑文燕,等. 长江口北槽航道回淤原因分析[J]. 水运工程,2009(06): 91-102. Tan Zewei, Fan Qijin, Zheng Wenyan, et al. Analysis of reasons for the siltation in North Passage of Yangtze Estuary[J]. Port & Waterway Engineering, 2009(06): 91-102.

Dai Z J, Liu J T, Fu G, et al. A thirteen-year record of bathymetric changes in the North Passage, Changjiang (Yangtze) estuary[J]. Geomorphology, 2013, 187: 101-107.

潘灵芝,丁平兴,葛建忠,等. 长江口深水航道整治工程影响下北槽河床冲淤变化分析[J]. 泥沙研究,2011(5): 51-60. Pan Lingzhi, Ding Pingxing, Ge Jianzhong, et al. Analysis of influence of Deep Waterway Project on morphological change in North Passage of Changjiang Estuary[J]. Journal of Sediment Research, 2011(5): 51-60.

冯凌旋. 长江口南北槽分流口演变及其对北槽深水航道整治工程的响应 [D]. 上海: 华东师范大学,2010. Feng Lingxuan. Morphological evolution of the South and North Passage Diffluence Pass in the Yangtze Estuary and its response to the Deepwater Channel Regulation Project [D]. Shanghai: East China Normal University, 2010.

陈炜,李九发,李为华. 近期长江口南北槽分流口河段悬沙输运机制研究[J]. 长江流域资源与环境,2013,22(7):865-870. Chen Wei, Li Jiufa, Li Weihua. Recent suspended sediment transport in bifurcation area of North and South Passage of the Yangtze Estuary[J]. Resources and Environment in the Yangtze Basin, 2013, 22(7): 865-870.

陈吉余,沈焕庭,恽才兴,等. 长江河口动力过程和地貌演变[M]. 上海: 上海科学技术出版社,1990. Chen Jiyu, Shen Huanting, Yun Caixing, et al. Dynamic process and morphological evolution in the Changjiang Estuary[M]. Shanghai: Shanghai Scientific and Technical Publishers, 1990.

沈焕庭,李九发,朱慧芳. 长江河口悬沙输移特性[J]. 泥沙研究,1986(1):1-13. Shen Huanting, Li Jiufa, Zhu Huifang. Transport of the suspended sediments in the Changjiang Estuary[J]. Journal of Sediment Research, 1986(1):1-13.

Bowden K F. The mixing processes in a tidal estuary[J]. International Journal of Air and water pollution, 1963, 7: 343-356.

Hansen D V. Current and mixing in the Columbia River Estuary [C]//Transactions of the Joint Conference of the Marine Technology Society and American Society of Limnology and Oceanography. Washington D C, 1965: 943-955.

Fischer H B. Mass transport mechanisms in partially stratified estuaries[J]. Journal of Fluid Mechanics, 1972, 53: 672-687.

Dyer K R. The salt balance in stratified estuaries[J]. Estuarine and Coastal Marine Science, 1974, 2: 275-281.

Dyer K R. The balance of suspended sediment in the Gironde and Thames Estuaries [C]//Estuarine Transport Processes. Giessen: Bruhlsche universitatsdruckerst Publisher, 1978: 125-133.

Uncles R J, Elliott R C A, Weston S A, et al. Synoptic observations of salinity, suspended sediment and vertical current structure in a partly mixed estuary[J]. Lecture Notes on Coastal and Estuarine Studies, 1986, 16: 58-70.

Su J L, Wang K S. The suspended sediment balance in Changjiang Estuary[J]. Estuarine, Coastal and Shelf Science, 1986, 23(1): 81-98.

王康缮,苏纪兰. 长江口南港环流及悬移物质输运的计算分析[J]. 海洋学报,1987, 9(5): 627-637. Wang Kangshan, Su Jilan. Analysis of circulation and suspended sediment transport in South channel of the Changjiang Estuary[J]. Acta Oceanologica Sinica, 1987, 9(5): 627-637.

沈健,沈焕庭,潘定安,等. 长江河口最大混浊带水沙输运机制分析[J]. 地理学报,1995,50(5):411-420. Shen Jian, Shen Huanting, Pan Ding,an, et al. Analysis of transport mechanism of water and suspended sediment in the turbidity maximum of the Changjiang Estuary[J]. Acta Geographica Sinica, 1995, 50(5):411-420.

吴家学,沈焕庭,吴华林. 潮汐河口断面悬沙通量组分模式及其在长江口的应用[J]. 海洋学报,2002,24(6):49-58. Wu Jiaxue, Shen Huanting, Wu Hualin. Fractional model of cross-sectional suspended sediment flux and its application in the Changjiang(Yangtze) Estuary[J]. Acta Oceanologica Sinica, 2002,24(6):49-58.

张文静,朱首贤,沙文钰. 二维悬沙长期输运速度的定义和机理分析[J]. 海洋工程,2003,21(3):56-82. Zhang Wenjing, Zhu Shouxian, Sha Wenyu. Definition and mechanism analysis of two-dimensional long-period transport velocity of suspended sediment[J]. The Ocean Engineering, 2003, 21(3):56-82.

刘高峰,朱建荣,沈焕庭. 河口涨落潮槽水沙输运机制研究[J]. 泥沙研究,2005(5):51-57. Liu Gaofeng, Zhu Jianrong, Shen Huanting. Study on mechanism of water and suspended sediment transport in flood and ebb channels[J]. Journal of Sediment Research, 2005(5):51-57.

陈炜,李九发,李占海,等. 长江口北支强潮河道悬沙运动及输移机制[J]. 海洋学报,2012,34(2):84-91. Chen Wei, Li Jiufa, Li Zhanhai, et al. The suspended sediment transportation and its mechanism in strong tidal reaches of the North Branch of the Changjiang Estuary[J]. Acta Oceanologica Sinica, 2012, 34(2):84-91.

赵方方,李占海,李九发,等. 长江口北支小潮至大潮水沙输运机制研究[J]. 泥沙研究,2013(4):55-62. Zhao Fangfang, Li Zhanhai, Li Jiufa, et al. Mechanism of water and suspended sediment transport from neap tide to spring tide in North Branch of Changjiang Estuary[J]. Journal of Sediment Research, 2013(4):55-62.

蒋陈娟,李九发,吴华林,等. 长江河口北槽水沙过程对航道整治工程的响应[J]. 海洋学报,2013,35(4):129-141. Jiang Chenjuan, Li Jiufa, Wu Hualin, et al. Effects of the Deep Waterway Project on the characteristics of hydrodynamics and sediment dynamics in the North Passage of the Changjiang Estuary[J]. Acta Oceanologica Sinica, 2013, 35(4):129-141.

高敏,范期锦,谈泽炜,等. 对长江口北槽分流比的分析研究[J]. 水运工程,2009,427(5): 82-86. Gao Min, Fan Qijin, Tan Zewei, et al. Research on bifurcation ratio in the North Passage of Yangtze Estuary[J]. Port & Waterway Engineering, 2009, 427(5): 82-86.

施引文献

资源附件(0)

访问统计