ANALYSES OF WIND-INDUCED FLOW AND MIXING IN STRATIFIED WATER BODY USING IMAGE PROCESSING AND PIV METHODS

Abstract

Experimental and numerical investigations were conducted in order to understand the windinduced flow and mixing in a closed stratified water body. The two-layer density model was provided in a two-dimensional wind flume. Measurements of conductivity at several vertical points were performed, and the result of the density measurements was compared with the luminance value obtained by the image processing technique. The distributions of luminance were comparable to that of conductivity. The PIV method was also used to measure the two-dimensional velocity field near the density interface. The velocity field by the PIV was compared with the numerical results by the κ-ε model with the TVD-MUSCL scheme. It was found that the major feature of the velocity field could be reproduced qualitatively by the present numerical model.