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<br />R1v.r by debris flo.s cr..t. or ch.ng. hydr.ulic control. (rapids)j th...
<br />controll app.ar to be governed by theugnit...da and fr.qu.ncy of tributary.
<br />flow .v.nts and the hiatory of clhch.rge. on the Color.clo Riv.r. Reworking
<br />of debris fans by the Coloraclo Riv.r cr.aee. clabrl. b.r. th.t conatr.ln the
<br />a1l:. of .ddy syat... and fol'JU ..condary rapids and riffl.. b.low tributary
<br />lIOutha.
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<br />S.diJI.nttransport.d froll s...ll drainages isapotllntially
<br />aignificant contributiontoth.s.dillentbudget of th.e Colorado Ri...,er in
<br />Grand Canyon N.tionalPark, Arizona (fig. 1). Little is known ab()ut the
<br />annual s.dillentyi.lds frollth.sedrainages; how.v.r, many r.s.arch.rs have
<br />not.d the .ffic.cy, of tributari.sfor moving large boulders intoth.
<br />Colorado River. which locally form rapids (Dolan and others , 1978;;,.Graf,
<br />1979; Hallblin andR1gby, 1968; Kieffer ,1985; Leopold, 1969). . Indeed,
<br />large r.pids ...y b. th.lIOst obvious geomorphic and hydrologic
<br />aariif..tation of ..dfaenttransport frolls...ll dr.inag.. in Grand Canyon
<br />N.tional P.rk.
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<br />E.tiDlationof..d1Jlent ,yi.lclSfroll '" ungag.dColorado Riv.r
<br />. tributariesinGrancl CanyonN.tiO'i'l&lPark 11' difficult ',and 'uncertainti.lI"in>
<br />cited "figur..ar.larg.. ,Howard',md,Dolan(l98l)..tiDlat.d,anaverage,
<br />annual..cl1aentyi.ldfor th.se tribut&ri.. of. 2;100 acr..ft/yr by. us.' of,.
<br />..diaent..... balanc. for, the Colorado].R.iv.r." Howevt.r.th~y'e.tiD8.ted..\the
<br />' ,change ,.,in','.',.torage, "of '.,..dillent'..in,,',thebed,cof<.th.,.Colorado.,.,'Ri..,.rb,,\Uling,an '
<br />aver.g. channel".'.,' width , and'byasaUll1ng.thit.sandcover.danaV~r~ge::of,;.75,'
<br />p.rc.ntof,'th.cba:aDelbed. Laur..n:".and.:Oth.r.(1976)...tiMt4ld'an.&vet:ag. ,.'"
<br />anmaal ..d1aent yt.ld<,',of ,.0. 7acr..f.t/yrOf:.b.ach-bu11d.i11g;"'~~;"OIlith.;
<br />b..l.".Of".cl1ff.r.nc..ln".,'SU8p8llded....c!1M1lt;.,.trauport:b.t1na.1:I,:;'jji.th~..:igallng:' ,,' .
<br />.tations" .t',th., , Colorado ".,.R1v.r:,.tIA.~-F.1:ry;ancl.tblt:,Color.ae.Rivar!J.~:
<br />Grand 'CaI1ycnt..," ,Mas. ..b.lanc...tiJlat....Of.....cUaantJ...;Yl.~~i;-,<<?~t&ln.,
<br />, , COnaiderabl.,unc.reainty<b.cause..."th.ctumge",..btb.d.tor.g.,:1.'~,;'<<., .'".
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<br />, .', 'us1ngll8thodologypr...nted' byth.PaciflC;:S,f)Uthve.t.Int.~..Ag~Ucy...~..ltt:..
<br />""'; , (1968 )"~""" ,..' Thls", ...thodology,W..,dev.lop.d.,fr~!r~.land\lIOtlit~ring.,.~fo~.ts,
<br />" ','.,'on;,t.rr.ln"..with .10. ""to .JIOclar.t.topoar.ph1c...., "..r.li.f.>,'.'Sediaent.:;j'i.lCJii' are
<br />,detera1ned ". frOll a '",'.,quaa1..anal7t1c&l,...,., '.' proc.dur.tbati. '.' b..~d'on.g.olo&y.
<br />8011., ", clUat., clrainap..basincbaracteri.tic.; and channel.8t:ah11ity-o, Us.
<br />oftb.,..tbo40logy 'r.quir..:th... tacit " aar.apt1ontll4t, ..df.Jleilt,is
<br />tr8DlJtOrtect ,byle1rtonian.,.trea..nov.The Mthod.produc..-at..d1.Mnt ,y1..ld
<br />' .' per uri1t area, Rich illpli...,thac. dr.1naS.-b..in ar.a~ 1. the IIOst illportant '
<br />,';" factor Influencing .ed1aent yi.ld; ,',,'.,., ',',', ,". ..',. .
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