en Water-Hydrology Water-Hydrology Technical Note Technical Note In this study digital image correlation (DIC) technique combined with a high speed video system was used to predict movement of particles in a water model. Comparing with Particle-image velocimetry (PIV) technique, it provides a low cost alternative approach to visualize flow fields and was successfully employed to predict the movement of particles in a water model at different submergence depth using gas injection. As the submergence depth increases, the number of the exposed eye is reduced accordingly. At 26.4 cm submergence depth, an exposed eye was found at 1/3 of the submergence depth, whereas two exposed eyes were observed at 1/2 depth and near the bottom wall at 24 cm submergence depth. Digital image correlation (DIC), Fluid flow, Water model, Mixing. 270 275 http://ijce.iust.ac.ir/browse.php?a_code=A-10-1372-2&slc_lang=en&sid=1 Jui-Chao Kuo jckuo@mail.ncku.edu.tw 180031947532846008031 180031947532846008031 Yes National Cheng-Kung University Teng-Yi Kuo 180031947532846008032 180031947532846008032 No National Cheng-Kung University Cheng-Han Wu 180031947532846008033 180031947532846008033 No National Cheng-Kung University Shih-Heng Tung shtung@nuk.edu.tw 180031947532846008034 180031947532846008034 No National University of Kaohsiung MIng-Hsiang Shih iloveaachen@gmail.com 180031947532846008035 180031947532846008035 No National Chi Nan University Wen-Pei Sung wps@ncut.edu.tw 180031947532846008036 180031947532846008036 No National Chin-Yi University of Technology Weng-Sing Hwang 180031947532846008037 180031947532846008037 No National Cheng-Kung University