大亚湾冬季海流波动的分析

Analysis of winter current fluctuation in Daya Bay

本文以实测资料为依据,利用时间序列功率谱的方法,分析大亚湾湾口冬季的海流波动特点,得出了本海域海流波动是以半日分潮潮流为主的半日分潮、全日分潮和浅海分潮潮流共存的波动形式,其振幅表层大于底层等结论。文中还指出了半日分潮、全日分潮和浅海分潮潮流波动振幅变化的特征。

In this paper, we process the field-data by means of time series analysis method, and analyse the current fluctuation feature near the mouth of the Daya Bay in winter. We point out the current is composed of diurnal current, semi-diurnal current and shallow water constituents, and the semi-diurnal current occupies an important posistion. The current fluctuation range is larger at the upper layer than the bottom layer, and Station C2 than Station C1. The correlation of current fluctuation between various layers and various stations is well. The current fluctuation is synchronism at the same station. At Station C1, current fluctuation phase of diurnal and semi-diurnal currents fall behind C2 station and the shallow water constituents are on the opposite. We also discuss the characteristics of amplitude variation of diurnal current, semi-diurnal current and shallow water constituents.