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<br />~ <br /> <br />Proceedings of the Seventh Federal Interagency Sedimentation Conference. March 25 10 19. 2001. Reno. Nevada <br /> <br />. <br /> <br />A. <br /> <br />. <br /> <br /> <br />Figure 1. Rotating sonar images from the Colorado River at the Grand Canyon gage cableway. <br />Flow is approximately from top of the image to the bottom. Bright areas on the image are strong <br />acoustic reflections, indicating slopes that are facing toward the centrally located sonar <br />transducer. The diameter of the circular part of the image is 20 m. Numbers identify 6 specific <br />locations on 6 dunes. A. Image at initial time ofbedfonn migration measurements, B. Same area <br />of river bed after 2.5 hours of dune migration. C. Initial image with dune migration vectors <br />superimposed. To track individual dunes requires viewing the intervening frames. The mean <br />dune migration distance during the observation period was 2 m, and the migration speed was <br />0.02 cm/s. <br /> <br />. <br /> <br />111- 141 <br />