涂成东, 纪棋严, 左军成
浙江海洋大学海洋科学与技术学院, 浙江 舟山 316022

摘要:
基于非结构网格半隐式跨尺度海洋模式（semi-implicit cross-scale hydroscience integrated system model，SCHISM），作者采用非结构三角网格，对全球大洋潮波进行数值模拟。通过调和分析，将196个潮位站的实测数据与模拟结果进行比较验证，两者符合良好，M₂、K₁分潮同潮图的形态也与TPXO8、FES2014b和NAO.99b模型给出的相似。根据模拟结果，给出了M₂、S₂、K₁、O₁4个主要分潮的同潮图。结果表明，太平洋中存在8个M₂分潮无潮点，大西洋中存在4个M₂分潮无潮点，印度洋中存在3个M₂分潮无潮点。总体上来说，M₂分潮在北太平洋和北大西洋东岸附近海域的振幅大于西岸附近海域的振幅，而在南太平洋和南大西洋情况相反。S₂分潮分布特征与M₂分潮类似，但振幅较小。太平洋中存在5个K₁分潮无潮点，大西洋中存在3个K₁分潮无潮点，印度洋中存在2个K₁分潮无潮点。K₁分潮的振幅普遍较小，在大部分海域不超过30 cm，在北太平洋和南极洲附近海域，由大洋向近岸有增加的趋势。太平洋中存在4个O₁分潮无潮点，大西洋和印度洋中各存在2个无潮点。O₁分潮在大部分海域不超过20 cm，在北太平洋和南极洲附近海域，由大洋向近岸有增加的趋势。最后，讨论了本模型与对比模型之间误差存在的原因。
关键词:SCHISM全球潮波数值模拟
DOI：10.11759/hykx20200826002
分类号:P731.2
基金项目:国家重点研发计划项目（2016YFC1401406）

Global tide simulation based on the semi-implicit cross-scale hydroscience integrated system model
TU Cheng-dong, JI Qi-yan, ZUO Jun-cheng
School of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, China
Abstract:
Based on the SCHISM (semi-implicit cross-scale hydroscience integrated system model), an unstructured triangular grid is used to numerically simulate global ocean tides. Through harmonic analysis, the measured data of 196 tidal stations are compared with simulated results to verify that the two are in good agreement. The shape of the cotidal global M₂ and K₁chart components were found to be similar to those given by the TPXO8, FES2014b, and NAO99.b models. According to the simulated results, the cotidal charts of the four main components of M₂, S₂, K₁, and O₁ are given. The results show that there are eight M₂ amphidromic points in the Pacific Ocean, four M₂ amphidromic points in the Atlantic Ocean, and 3 M₂ amphidromic points in the Indian Ocean. Generally speaking, the amplitudes of the M₂ tidal component in the waters near the eastern border of the North Pacific and North Atlantic oceans are always greater than that of the waters near the western border, whereas the opposite is true in the South Pacific and South Atlantic oceans. The distribution characteristics of the S₂ tidal component are similar to that of the M₂ tidal component, although the amplitude is smaller. There are five K₁ amphidromic points in the Pacific Ocean, three K₁ amphidromic points in the Atlantic Ocean, and two K₁ amphidromic points in the Indian Ocean. The amplitude of the K₁ tidal component is generally small, not exceeding 30 cm in most sea areas, in the waters near the North Pacific and Antarctica with an increasing trend from an ocean to a nearshore. There are four amphidromic points of O₁ in the Pacific Ocean and two amphidromic points in the Atlantic and Indian Oceans. The amplitude of the O₁ tidal component does not exceed 20 cm in most sea areas, and in the waters near the North Pacific and Antarctica there is an increasing trend from an ocean to a nearshore. Finally, the reasons for the errors between the proposed model and the comparison model are discussed.
Key words:SCHISMglobal tidesnumerical simulation





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