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! Introduction! Methods  ..5 Navigation  5 Instrumentation^ Seismic Reflection  5 Side-scan Sonar  5 Underwater Video? Data Analysis? Description of Reaches 9 Reach A9 Reach B9 Reach C...  ....9 Reach D15 Reach E15 Reach F  15 Discussion  22 Conclusion  23 List or Figures: Figure 1 Location of the monitored reaches 2 Figure 2 Location of monumented cross sections  3 Figure 3 Section of the high-resolution seismic reflection profile data6 Figure 4 Map, Photo, and side scan sonar images 8 Figure 5 Reach A 10 Figure 6 Combined changes along reach A....  1 1 Figure 7 Reach B12 Figure 8 Combined changes along reach B 13 Figure 9 Reach C  14 Figure 10 Combined changes along reach C  16 Figure 11 Reach D17 Figure 12 Combined changes along reach D..  18 Figure 13 Reach E29 Figure 14 Combined changes along reach E..  20 Figure 15 Reach F21 Figure 16 Combined changes along reach F..  24 Figure 17 Plots of percentages of sand-size sediment along reaches A and B between  25 Figure 18 Plots of percentages of sand-size sediment along reach C and D27 Figure 19 Plots of percentages of sand-size sediment along reach E and F 29 Figure 20 Plots of reaches A, B, and C combined, and D, E, and F combined  31 Table: Table 1 Reaches along the Colorado River Corridor surveyed...  .4 Comparison of Sand Distribution Between April 1994 and June 1996 along in Six Reaches of the Colorado River, in Grand Canyon, Arizona Roberto J. Anima, Michael S. Marlow, David M. Rubin and David J. Hogg U.S. Geological Survey Coastal and Marine Geology Team 345 Middlefield Road M/S 999 , Menlo Park, CA. 94025 Abstract Two geophysical surveys in April, 1994 and June, 1996 collected data along 15 reaches of the Colorado River in Grand Canyon. This report discusses six of those reaches between the Little Colorado River and Tanner Rapid. The surveys imaged the distribution of sand and mixtures of sand with pebbles, cobbles and boulders stored within the reaches. The surveys established a baseline of sand distribution before an experimental flood in March, 1996 and mapped changes in the areal distribution of sand within each reach after the 1996 flood. This study does not attempt to estimate the volume change in sediment stored within the reaches. Survey control relied on a network of monuments established by the Glen Canyon Environmental Study (GCES) and the United States Geological Survey Water Resources Division (WRD). The 1994 survey utilized a high-resolution seismic-reflection profiler, a side-scan sonar system, a bathymetric profiler, and underwater video system. The 1996 survey did not use the high-resolution seismic profiler because the system was generally unsuccessful in detecting subsurface structure due to multiples created in shallow water. Both surveys used underwater video to collect images of the river bed to validate our interpretations of the side-scan record. This report describes data collection, interpretation, and discusses trends found along the reaches studied in detail. Introduction This report is part of a study by the U.S. Geological Survey (USGS) and the Glen Canyon Environmental Study (GCES, now the Grand Canyon Monitoring and Research Center, GCMRC), to analyze sediment transport within the Grand Canyon system in response to controlled water releases at Glen Canyon Dam (Fig. 1). Graf et al. (1995) give an excellent summary of the establishment of GCES, and the Congressional mandates regulating Glen Canyon Dam. This report presents data collected by the USGS (Coastal and Marine Geology Team) for GCES during two cruises. The first cruise was conducted between April 24 and May 13, 1994, and the second in June of 1996, following the experimental flow of March 1996. Data shown in this report include side-scan sonar and video images for both cruises, and examples of the high-resolution seismic-reflection records collected during the 1994 cruise. Data were collected along 32 traverses that cross 6 reaches located along 11 kilometers below the Little Colorado River (LCR) to Tanner Rapid (Fig. 2). This study provides a baseline of sediment distribution and its temporal variability for six reaches below the LCR) Additional data were collected along 10 additional reaches both above and below the LCR (Table 1). All analog and digital data are stored in U.S. Geological Survey Coastal and Marine Geology Team archives. 37 113' UTAH 112' 111

Comparison of sand distribution between April 1994 and June 1996 along six reaches of the Colorado River in Grand Canyon, Arizona