AN APPLICATION OF DYE INJECTION METHOD FOR MEASUREMENT OF DEPTH-AVERAGED VELOCITY DISTRIBUTION OF SHALLOW WATER

Abstract

Conventionally, two-dimensional velocity distribution of model experiment with relatively shallow water depth has been measured by surface tracers because intrusion of probe itself will disturb the flow field significantly especially, in the case of movable bed experiment. However, surface flow is not always a good representation of mean flow when secondary flow effects are not negligible. On the other hand, the dye-injection method has been used for understanding general flow features by visualizing the depthwise flow. In this paper, a novel idea of utilizing dye-injected flow images for the measurement of depth-averaged velocity distribution is proposed. Through the particle simulation and experiments using straight and curved channels, the validity of the new idea was verified.