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a) <br />1560 <br />y <br />d <br />m <br />E <br />c <br />0 <br />w <br />R <br />d <br />W <br />Rulison-Cameo, CO <br />Cisco-Moab, UT <br />Dolores <br />River <br />180 170 160 150 140 130 120 110 100 <br />Distance Upstream from Green River Confluence (km) <br />Figure 17. Plots of channel gradient in selected subreaches of the Colorado River <br />between (a) Rulison and Cameo, CO, and (b) Cisco Landing and Moab, UT. <br />The bed sediment texture of the Colorado River can vary significantly from place to place (see <br />appendix Tables A-2 and A-3). Nonetheless, plots of specific percentiles of the grain size <br />distribution (D8, D50, and D16) show that the sizes of both the surface and subsurface bed material <br />decrease systematically downstream (Fig. 18). Exponential fits of the surface-sediment data (Fig. <br />18a) give a series of subparallel lines with slopes ranging from 0.0009 to 0.0011. Percentiles of the <br />subsurface sediment size distributions are also well fit by exponential functions (Fig. 18b), <br />although the exponents in these relations are somewhat higher (0.0021-0.0034) than in the surface- <br />sediment relations. <br />1540 <br />a? <br />a? <br />1520 <br />c <br />1500 <br />?o <br />to 1480 <br />1460 <br />b) <br />1270 <br />1260 <br />1250 <br />1240 <br />1230 <br />1220 <br />1210 <br />1200 <br />28 <br />370 360 350 340 330 320 310 <br />Distance Upstream from Green River Confluence (km)