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利用粤东寮咀口岬间海滩重复测量的剖面数据 ,通过经验特征函数及主要空间函数的分析和功率谱估计分析 ,结果表明 ,海滩剖面主要由 2个空间模式构成 :前滨模式和滩肩模式。空间模式在时域上具有一定的振荡周期。其中 ,前滨模式以 4天的准周期变化为主 ,滩肩模式则有 2 8天的准周期性变化。此外 ,影响海滩剖面短期变化的主要动力因素是波浪 ,台风大浪则是剖面迅速变化的直接驱动力。
Based on the repeated measurements of cross-section data of beach in Liaotu, Guangdong Province, through the analysis of the empirical eigenfunctions and main spatial functions and the power spectrum estimation, the results show that the beach profile is mainly composed of two spatial modes: foreshore model and beach shoulder mode. Spatial modes have a certain period of oscillation in the time domain. Among them, the foreshore model to 4-day quasi-period-based changes, beach shoulder mode has 28 days of quasi-cyclical changes. In addition, the major driving force behind the short-term changes in beach profile is the waves, while the typhoon waves are the direct drivers of rapid changes in the profile.