Abstract

Lagrangian fluid motion under breaking waves and settling motion of glass-particles released into a still water are measured by the 3D stereoscopic particle tracking velocimetry for a large domain (3DSPTV-LD). Since the 3DSPTV-LD dose not require to use a laser sheet for illuminating a single flow plane in a measur domain, it has an advantageous feature in engineering use -i.e. high applicability to 3D measurementsfor a large domain on less costs. In coastal engineering, the large-scale turbulence associated with a large-scale eddy structur, such as a separated vortex array around a structure, which futures three-dimensional behav-iora.is one of the crucial factors affecting sediment transport and stability of a structurc.The 3DSPTV-LD enables it to acquire the 3D large-scale Lagrangian motion over a wide area.

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