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Dredged hole in the nearshore zone may change direction of wave propagation due to wave refraction and diffraction. These physical phenomenon change the longshore sediment transport and hence the shoreline. In order to evaluate the pattern change of shoreline under short wave condition, some experiments were conducted in 3D wave basin. Wave height and topography of the beach were measured before and after sand dredging. The shoreline change due to sand dredging at the nearshore bar is discussed in terms of the change of wave breaking position at the lee of dredged hole and its both sides before and after sand dredging. The result showed the shoreline accretion and erosion at the lee and both sides of dredged hole after sand bar dredging. It is shown the significant physical characteristics are responsible for change the pattern of the shoreline. The source of infilled sediment and infill rate of dredged hole is also discussed.

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