Abstract
Field measurements using an image analysis technique, the large-scale particle image velocimetry (LSPIV), are conducted for a river reach having a series of groins in the Uji River. The measurements are performed using a digital video camera from a height of 27m of the nearby tower for meteorological survey. The river reach with a streamwise length of about 150m and the width of about 60m is cover by three-angle recordings. The measurement results from each angle are successfully connected with each other, by which the general flow feature of the region can be revealed with a reasonable accuracy. The measurement by an ADCP is also performed to obtain the internal three-dimensional flow structure. In addition, a numerical simulation based on the unstructured grid system of the shallow water equation is conducted to compare with the field measurement results and to evaluate the effect of the groins to the main flow.
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