伶仃洋河口横向环流

易侃; 龚文平

doi:10.3969/j.issn.0253-4193.2015.03.001

伶仃洋河口横向环流

doi: 10.3969/j.issn.0253-4193.2015.03.001

易侃,
龚文平

中山大学海洋学院近岸海洋科技研究中心, 广东广州 510275

基金项目: 国家自然科学基金(41061130542)。

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出版历程
- 收稿日期: 2014-05-12

Lateral circulation in the Lingding Estuary

Center for Coastal Ocean Science and Technology Research, School of Marine Science, Sun Yat-sen University, Guangzhou 510275, China

摘要

摘要: 横向环流存在于大多数河口中,在河口的动量平衡和物质输运过程中起着重要的作用,其形成的机制众多。本文利用三维水动力模型EFDC(Environmental Fluid Dynamics Code),结合1989年和2002年的实测数据对伶仃洋河口进行研究,得到了伶仃洋河口在洪季和枯季时期不同的水动力和盐度分布结构。在文中选取了具有代表性的两个断面,针对洪枯季、大小潮以及涨落潮等不同时期的横向流结构和盐度剖面分布特点进行比较和分析。结果显示,受局地的径、潮流条件和地形约束影响,横向环流结构并不能充分形成,在不同的区域表现出截然不同的结构特点。伶仃洋河口横向环流主要是在径、潮流与地形三者之间的相互作用下形成的,不同的区域的形成机制存在差异。综合分析后,本文认为伶仃洋河口的横向环流在该区域的动力过程中相对较为次要。
- 伶仃洋河口 /
- EFDC模型 /
- 河口横向环流 /
- 水动力
Abstract: Lateral circulation,which can be generated in estuarine systems by a variety of mechanisms,plays an important role in the momentum balance and mass transport in estuaries. A three-dimensional hydrodynamic model (EFDC),combined with field measurement data in 1989 and 2002,is used to investigate the lateral circulation in the Lingding Estuary. The model have successfully reproduced the hydrodynamics and salinity distribution during the flood and dry seasons. Two cross-sectional profiles in two different regions are chosen to examine the lateral circulation and salinity dynamics in different periods. The results show that lateral circulation is poorly developed in the Lingding Estuary and features more local characteristics because of its special bathymetry and hydrodynamic conditions. The lateral circulation in the Lingding Estuary is generated by the interaction among river flow,tidal currents and bathymetry,and the mechanisms in two sections are different. In this study,we conclude that lateral circulation is not significant for the dynamics of Lingding Estuary.
- Lingding Estuary /
- EFDC model /
- lateral circulation /
- estuarine hydrodynamics

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参考文献(17)

Smith R. Longitudinal dispersion of a buoyant contaminant in a shallow channel[J]. Journal of Fluid Mechanics,1976,78(04):677-688.

West J R,Mangat J S. The determination and prediction of longitudinal dispersion coefficients in a narrow,shallow estuary[J]. Estuarine,Coastal and Shelf Science,1986,22(2):161-181.

Guymer I,West J R. Longitudinal dispersion coefficients in estuary[J]. Journal of Hydraulic Engineering,1992,118(5):718-734.

Seim H E,Gregg M C. The importance of aspiration and channel curvature in producing strong vertical mixing over a sill[J]. Journal of Geophysical Research: Oceans (1978-2012),1997,102(C2):3451-3472.

Geyer W R,Signell R P,Kineke G C. Lateral trapping of sediment in a partially mixed estuary [C]//Physics of Estuaries and Coastal Seas: Proceedings of the 8th International Biennial Conference on Physics of Estuaries and Coastal Seas.1998: 115-124.

Nidzieko N J,Hench J L,Monismith S G. Lateral circulation in well-mixed and stratified estuarine flows with curvature[J]. Journal of Physical Oceanography,2009,39(4):831-851.

Lerczak J A,Rockwell G W. Modeling the lateral circulation in straight,stratified estuaries[J]. Journal of Physical Oceanography,2004,34(6): 1410-1428.

Chen S N,Sanford L P. Lateral circulation driven by boundary mixing and the associated transport of sediments in idealized partially mixed estuaries[J]. Continental Shelf Research,2009,29(1):101-118.

Chen S N,Sanford L P,Ralston D K. Lateral circulation and sediment transport driven by axial winds in an idealized,partially mixed estuary[J]. Journal of Geophysical Research: Oceans (1978-2012),2009,114(C12):C12006.

Valle-Levinson A,Li C,Wong K C,et al. Convergence of lateral flow along a coastal plain estuary[J]. Journal of Geophysical Research: Oceans (1978-2012),2000,105(C7): 17045-17061.

Wong L A,Chen J C,Xue H,et al. A model study of the circulation in the Pearl River Estuary (PRE) and its adjacent coastal waters: 1. Simulations and comparison with observations[J]. Journal of Geophysical Research: Oceans (1978-2012),2003,108(C5):3156.

袁丽蓉,杨清书,谢莉莉,等. 人类活动干扰下伶仃洋河口湾地形演变趋势变化 [C]//第十六届中国海洋 (岸) 工程学术讨论会 (下册). 2013. Yuan Lirong,Yang Qingshu,Xie Lili,et al.Trend of the Lingding Estuary topographic evolution under human interference [C]//The 16th China Ocean(Shore)Engineering Symposium(the 2nd volume).2013.

应秩甫,陈世光. 珠江口伶仃洋咸淡水混合特征[J]. 海洋学报,1983,5(1):1-10. Ying Zhifu,Chen Shiguang.The characteristics of saline and fresh water mixing in the Lingding Estuary[J]. Haiyang Xuebao,1983,5(1):1-10.

赵焕庭. 珠江河口湾伶仃洋的地形[J]. 海洋学报,1981,3(2):255-274. Zhao Huanting.The topography of the Lingding,Pearl River Estuary[J]. Haiyang Xuebao,1981,3(2):255-274.

应秩甫,伶仃洋横向动力平衡[M]//珠江口海岸带和滩涂资源综合调查研究文集(四).广州:广东科技出版社,1986. Ying Zhifu.The lateral dynamic balance of the Lingding Estuary[M]//The Comprehensive Investigation and Research Anthology of the Coastal Zone and Salt Marsh Resources in the Pearl River Estuary(4th). Guangzhou: Guangdong Science and Technology Press,1986.

Hamrick J M. Users manual for the environmental fluid dynamics computer code [R].Special Report NO.331 in Applied Marine Science and Ocean Engineering,Virginia Institute of Marine Science,College of William and Mary,1996.

Hamrick J M. A three-dimensional environmental fluid dynamics computer code: the oretical and computational aspects [R]. Special Report 337,Virginia Institute of Marine Science,College of William and Mary,1992.

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