摘要
Abstract
This paper focused on the seasonal variation and influencing mechanisms of the major tidal constituents(M2,S2,K1,and O1).Using the sliding harmonic analysis method and numerical simulation experiments,tidal data from three tidal stations—Hong Kong(low-latitude region),Toyama,Japan(mid-latitude region),and Nome,the USA(high-latitude region)—over 10 years were analyzed.The results show that the four major tidal constituents exhibit annual,semi-annual,and 1/3-year periodic signals,with some constituents also showing 1/4-year periodic signals and clear trend terms.The amplitude of the tidal constituents is generally larger in summer than in winter,with little difference between spring and autumn.The seasonal average values obtained from sliding harmonic analysis are close to the calculated harmonic constants,which validates the reliability of the method.Through numerical simulation experiments,it is found that vertical eddy viscosity and sea surface height both affect the amplitude of tidal constituents,with vertical eddy viscosity having a more significant impact.These findings indicate that major tidal constituents have distinct seasonal variations,and the seasonal changes in vertical eddy viscosity are an important mechanism affecting the seasonal variation of major tidal constituents.关键词
海潮动力学/季节变化分析/滑动调和分析方法/数值模拟/垂直涡流黏度/海面高变化Key words
ocean tidal dynamics/seasonal variation analysis/sliding harmonic analysis method/numerical simulation/vertical eddy viscosity/sea surface height variation分类
测绘与仪器
