在潮差逐日变化的半个朔望月的周期里，有朔望大潮，它与月相有关。
In the tidal difference daily variations, there is a period of half lunar month of syzygy spring tides related to the phase of the moon.
笔者在阐明涡流波痕产地地理背景的基础上，指出大潮差沙滩的后滨是发育涡流波痕的理想环境。
Based on geographical setting where eddy ripple are produced, the author notes that the backshore of sandy beach with large tide range is the ideal environment of eddy ripples.
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