A novel system for the combined measurement of wave- and flow-fields beneath wind induced water waves

At the same time and location, simultaneous time series of wave slope images and the flow eld beneath water waves were obtained using an integrated set-up including particle-tracking and wave slope instruments. By an especially developed tracking algorithm, hundreds of seeding particles can be traced automatically, measuring the flow field. At the the same location the wave-field was measured with an illumination technique based on shape-from-refraction. Simultaneous flow- and wave- field measurements allow the investigation of transport processes across the water surface.