In this study, laboratory experiments are conducted to investigate flow-fields around floating breakwaters by
using the LDV (Laser Doppler Velocimetry) system. The LDV system is a well-known equipment to measure
fluid particle velocities in laboratory experiments. Although the system requires great efforts and enormous time
for measurements, it can provide precise velocity fields comparing to other available equipments. Various types
of drafts and shapes for breakwaters are employed in laboratory experiments to analyze a relation between flowfields
and vorticity. A series of numerical experiments are also carried out by using a two-dimensional NavierStokes
equations model. Numerically predicted results are compared with laboratory measurements.