Abstract
An indivisual coherent structure in a wind induced turbulent shear flow of water was investigated by using flow visualization technique and a Beam-Scanning-type LDV (SLV) which can measure pseudo-simultaneous velocity profile in a cross section. The visualization of the structure by applying conditional sampling technique indicated an appearance of the structure. But the numerical simulation with a vorton model showed a defect in the visualization technique. So by using SLV the structures were measured. The results of the investigation suggest that the condition to sample the structures is proper and that the quantitative results obtained before show the right features of the coherent structures.
