Ground Truth Trekking

Aeolian ladder ripples

I typically think of ladder ripples on sandy intertidal areas with large waves - large ripples form beneath waves and then smaller ones can form perpendicular to them from currents or small waves in troughs between along-shore bars. However these ripples are in coastal sand dunes in Peru. I assume they simply record a 90-degree transition from consistent daytime breezes from the ocean (forming the large ripples) and a brief period of evening along-shore breeze that were strong enough to begin building new ripples, but too short-lived to erase the originals.

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