热带海洋学报 ›› 2015, Vol. 34 ›› Issue (5): 40-50.doi: 10.11978/2014095CSTR: 32234.14.2014095

• 海洋地貌学 • 上一篇    下一篇

数值模拟英国利物浦湾在潮汐作用下的泥沙输运

罗晶1, 李明2, 孙志林1, 王威2   

  1. 1. 浙江大学海洋学院, 浙江 杭州 310058;
    2.利物浦大学工程学院, 英国 利物浦 L69 3GQ
  • 收稿日期:2014-08-19 修回日期:2014-12-24 出版日期:2015-09-11 发布日期:2015-09-11

Numerical simulation of tidal hydrodynamics and sediment transport in Liverpool Bay

LUO Jing1, LI Ming2, SUN Zhi-lin1, WANG Wei2   

  1. 1. Ocean College, Zhejiang University, Hangzhou 310058, China;
    2.School of Engineering, The University of Liverpool, Liverpool L69 3GQ, UK
  • Received:2014-08-19 Revised:2014-12-24 Online:2015-09-11 Published:2015-09-11

摘要: 通过二维数值模拟研究了位于英国西北海岸的利物浦湾在潮汐单独作用下的水动力以及泥沙输运情况。使用开源软件TELEMAC, 在对模型的源程序进行修改以后能够根据研究需要定制边界条件和初始条件。模型采取输入精简法对利物浦湾中长期的潮汐状况进行分类, 并对每种潮汐作用下的水动力与泥沙输运分别进行对比和分析, 最终确定了对利物浦湾的泥沙输运最相关的潮汐作为代表潮汐, 进而简化了潮汐作用下地形演变的长期计算。研究表明, 利物浦湾内河口海岸的水动力在潮汐作用下主要表现为非对称的涨落潮过程, 而泥沙输运会受到非对称潮汐和当地地形的显著影响。此外, 河口宽度和当地地形还会影响涨落潮的潮位和流速。潮差还会改变涨落潮流速、转流时间、输沙强度和输沙范围。

关键词: 潮汐, 泥沙输运, 河口, 数学模型

Abstract: In order to understand the influence of tide on sand exchange between an estuary and adjacent coastal region, three estuaries around North West England were chosen for detailed study using an open-source numerical morphological model system, TELEMAC. The source code of model was modified to customize tidal conditions and bed sand sizes. An “input- reduction” method was used to model sediment transport under several tides. “Morphological representative tide” was further achieved for long-term morphological modelling. It is clear that the dominant hydrodynamic processes of an estuary are influenced by tidal asymmetry. Local sediment transport is affected by seabed bathymetry and tidal asymmetry. Furthermore, shape and bathymetry of an estuary can influence tidal elevation and velocity. Tidal range can change transportation of the tidal wave which further changes the range of sediment transport.

Key words: tide, sediment transport, estuary, numerical model