潮水在沙上留下了波洑沙纹。
通过一托浅滩时，要一直测深校时水深及海面下多变的沙纹。
When passing One Fathom Bank, check the depth and variable sand waves below the sea level all the time by echo sounder.
海滨地区广泛存在涡动沙纹，它很大程度上决定着波浪衰减和泥沙运动。
Vortex ripples widely exist in coastal area and greatly control the attenuation of wave and movement of sediment.
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