抄録
Data acquisition of river flow information especially at a peak flow condition is indispensable for a proper management of a river basin. However, due to the difficulty to conduct a float method appropriately in an extremely fast flow, non-contact methods such as imaging techniques or radio wave velocity meters have become good candidates as alternative methods. Among them, imaging techniques used to have a weak point difficult to apply during the night, but we could overcome this problem by using a far infrared camera in the present research. The field measurements conducted at the Uono River yielded consistent results with radio wave velocity meters even in a dark condition. In addition, traceability of surface features composed of small wavy patterns to the surface flow was verified in a straightforward manner by comparing a space time image (STI) generated while applying the STI velocimetry (STIV) to the surface flow images.
