Nearshore surf zones are turbulent places. Yet despite the apparently chaotic nature of the sea surface in these areas, sandbars often show complex patterns with an intricate structure. We aim to discuss recent efforts to understand how these patterns form, considering new Non Linear transport mechanism based on flow acceleration within the waves. These mechanisms, the detailled monitoring and observations of the Patterns (By in situ or remote sensing) and the comparison with numerical models should help to improve the predictability of morfological sand structures, wave-current-coast interactions and sediment transport in beaches.