Abstract
Gravity currents are very important phenomenan for the marine environment.
In this paper, a new and original technique for simultaneous measurement of density field and velocity field is proposed.
If a density distribution changes in a certain area, the refractive index distribution in that area will change. So, the volume areas with a density distribution are inserted between a CCD camera and a picture, the picture moves small displacement corresponding to the density gradient. Integrate the displacement, density distribution is reproduced numerically.
Combining PIV method with the above procedure, it enable to measure both density and velocity simultaneously.Steady and unsteady flow fields are measured and compared with the data which measured by conductive salinity probes. The results show good agreement between them.
