摘要
大亚湾潮位具有独特的“双峰”现象,且表现为高潮时的双高水位.基于大亚湾10个临时潮位站1个月长度的冬季潮位观测资料,分析了大亚湾海域双峰现象的形成条件及准调和分量的应用.调和分析结果表明:浅水分潮(含倍潮M4与M6、复合分潮MS4与2MS6)振幅的增长是造成双峰现象强度在湾内增强的主要原因;潮波由湾口传播至湾顶时,复合分潮2MS6增长幅度最大,超过200%;单一复合分潮调制M2分潮形成的双峰特征随时间呈长周期变化.运用准调和分量分析可知:双峰水位的特征周期由浅水分潮与基础分潮的振幅比决定,分潮振幅和初相位影响特征周期内的双峰水位变化;此外,通过解析和分潮重构,发现用1/6日分潮的余弦准调和分量可以简化浅水分潮,重现实测水位中的双峰特征.
"Bimodal"phenomenon is unique for tides in the Daya Bay,especially for double high-water levels at high tides.Based on one month-long observations at 10 temporary tidal stations in the Daya Bay in winter,we analyzed the formation conditions of the bimodal phenomenon and the application of quasi-harmonic components in the Daya Bay.The harmonic analysis reveals that the increase in the amplitude of shallow water tides(including overtides M4 and M6,and composite partial tides MS4 and 2MS6)is the main reason for intensification of the bimodal phenomenon in the bay.When the tidal wave propagates from the mouth to the head of the bay,the amplitude of a composite constituent,2MS6,increases the most by more than 200%.The bimodal characteristic caused by single composite tide modulating the fundamental tide varies periodically with time.By using quasi-harmonic component analysis,we demonstrate that the characteristic period of double high-water levels is determined by the ratio of the amplitude of shallow water tides to that of the fundamental tide,and that the amplitude and initial phase of the tidal components affect the change of water level in the period.In addition,by analyzing and reconstructing partial tides,we find that the cosine quasi-harmonic component of sexta-diurnal tides can be used to simplify shallow water tides,and to reconstruct bimodal characteristic in the measured water level.
作者
彭帅星
朱佳
陈照章
孙振宇
杨龙奇
胡建宇
PENG Shuaixing;ZHU Jia;CHEN Zhaozhang;SUN Zhenyu;YANG Longqi;HU Jianyu(State Key Laboratory of Marine Environmental Science,College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China)
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第5期937-944,共8页
Journal of Xiamen University：Natural Science
基金
国家自然科学基金(41776027)
惠州市海洋渔业资源环境调查项目(F2017-01-1)。
关键词
潮汐
双峰现象
复合分潮
准调和分量
tide
bimodal phenomenon
composite tide
quasi-harmonic component
