Abstract
A new photographic technique has been used, in which a still camera, or a cinecamera with standard speeds, can be successfully used to photograph the rapid changes of breaking wind-wave surfaces. This photographic technique is an overlapping photographing technique which uses multiple strobes, flashing one after another at short intervals through optical filters of different colors. Using this technique, images of splashing droplets or of micro-scale configurations of wave surface at different instants are photographed in one picture, and the time sequences between the overlapping exposed images can be easily determined by their colors. This technique can also be used for comparative precise measurements of velocity vectors of fluid particles, including tracer particles in the air flow visualization over the waves.
