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<br />Seasonal Equivalent Equivalent thickness, in meters, under three assumptions about the <br />sediment volume, in relative proportion of fine sediment stored in eddies and in the main <br />accumulation, in cubic channel and two assumptions about the proportion of the channel that <br />metric tons meters1 can store fine sediment2 <br /> eddies channel eddies channel eddies channel <br />proportion of the [0.9] [0.9] [0,9] <br />channel that can (0.3) (0.3) (0.3) <br />store fine <br />sediment <br />relative 0.1 0.9 0.5 0.5 0.9 0.1 <br />proportion <br />stored in eddies <br />and the main <br />channel <br />1,000000 640,000 0.02 [0.04] 0.08 [0.02] 0.15 [0.00] <br /> (0.13) (0.07) (0.01) <br />7,000,000 4,460,000 0.11 [0.30] 0.57 [0.17] 1.03 [0,03] <br /> (0.91) (0.51) (0.10) <br />13,000,000 8,280,000 0.21 [0.56] 1.06 [0.31 ] 1.91 [0.06] <br /> (1.69) (0.94) (0.19) <br />I assumes bulk specific weight offine sediment is 1570 kglm3 <br />2 assumes area of eddies is 3.9 x 106 m2, and area of channel is 14.7 x 106 m2 <br /> <br /> <br />002366 <br /> <br />Figure 18. Map showing Glen Canyon and locations of cross-sections that have been measured since 1956 (Grams <br />et aI., 2004, fig. 1). River miles locations are in miles upstream from the present Lees Ferry cableway. <br /> <br /> <br />Glen Canyon Dam <br /> <br />-'" f\ <br />,-- <br />"" <br />1>.,,\\ <br /> <br />.1 <br /> <br />f" ~ <br />R.,irA:: <br /> <br />?.~"'~~"'. <br />F(df'j 5.",19 )) <br />. ._~)f <br />~~~ <br />"1"4'::;::--- ~ <br />{Lr 1 Reach 2 <br />.1 <br />1l~~ 9-.We Dr.'" <br /> <br />(r ! <br /> <br />-~. ~~ <br />~":;~~"'-.>. ",1>1'" .~ <br /> <br />cable",ay ( ( <br /> <br />rilft,,:, awos~E! ,,~ <br />p"".Ri-.~' .~. ~~\. <br />b'" ,/4 \" <br />- / il <br />'?~. RN~~'--~Ur~ <br />!/ .:.~ \ cabJcw.1Y <br /> <br />~ Leesl'e~cableW.yan<l \,. Reach 5 ,,\ <br />f USGS Gagmg Stabon ",.~~. _ L/o4 <br />, ...,,~'"!'.~/ <br />f Faile-'< ......---.. c..veC8n'1"" <br /> <br /> <br />Q.'8 <br /> <br />1/m19y Drfh-r <br /> <br />. . . . . <br />. " <br /> <br />Reach 3 <br /> <br />Legend <br />~ eddies;02 <br />.. "ebrisf"o.& <br /> <br /> <br />- cross sectionS <br />River \.lie k)cation. <br /> <br />~Va:er Hal.. Cimyon <br /> <br />(} 0.5 1 2 Kilomf<te,. <br />1 I Z I I I Ii f <br /> <br />Table 5. Estimates of the average change in fine sediment thickness in Marble and upper Grand Canyons <br />under various scenarios of seasonal sediment accumulation, relative proportion of accumulation stored in <br />eddies and the main channel, and proportion of the main channel where storage occurs. Bold numbers <br />indicate the most likely scenario for pre-dam seasonal storage of fine sediment. <br /> <br />28 System-wide Changes in the Distribution of Fine Sediment in the Colorado River Corridor ... <br />