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<br />~~ehH.el lror. I :lIeIelel,., t:[!hJi~'[e g
<br />
<br />One rea~(ln the 1<;97 H\IF and Ihe ~OOO H\IF did nol replenish
<br />high-d1.'~alion "<If'; i~ Ihallhe Ill)" magnilude "as n01 greal ('nough.
<br />In Figurl'... ph'llographs illuslrale Ihis pallem ofchange./Iigher slages
<br />increase IhC' accnmodalion \pace a\ailable for dero..ilinn lll.vcl 1.'1 al..
<br />199'J). '\\lTagl' Mea and \olume change.. tiJr the Ihrl'C controlled lk,(>ds.
<br />and f,lr the 19'13 Lillie Colorado RiH~r 1l0(>d. arc sh.)" " in Figure-t.
<br />..\1 di<;chal1;l"S ~k," f'll\wrplam capacil~ lhl' changes arc rlol si~ificantl~
<br />dilTerent fwm O. suggesting Ihal H\lF-I~pc Ill,"s are stage-limih:d
<br />The changes do....nsln:am oflhe L.illle Col.nado Ri~er in 1')<13 shll\~
<br />large poslli,,: ~alues al a discharge of950 mls. a 11<1.... ,'ol~ slighll~
<br />higher Ihao a H\IF. 'ole thaI the area in.:rea-.e in l'N3 is grealer Ihan
<br />thaI oflhl." 199(, IHUH:. "hereas Ihe ~olunH: Increa'>C is abouI half of
<br />Ihe 191)6 \illue. The Jq.9J 1l0"Jd crealed large deposits because 01 a
<br />greall~ incn:a-.ed sand ~urpl~. The 1996 BIIBF ~Ulll-.J in larger \olume
<br />deposils, even though Ihe salld suppl) \~as 10\~cr. \~ h,1c the..e results
<br />suggcsl Ihal high dis.:harges onc m,lre ellicient al producing largn
<br />\'olume deposih ifs,lIld is ,1\ailahl1.', Ihe 1993 dala show Ihal lo....er
<br />djsch~t.'S are capahleofn:pleni..hing lOand ~ during trihu!.."lI) 110<.'oding.
<br />
<br />[eo:Iel 11 4 .ell~l:heIeIo a.Iii1II[!)
<br />
<br />Timing dcliheralC' l1ood~ 10 coincid.: "ith or closel~ filllo\\ Irihut<!0
<br />sand inputs. typil'ally in laIc summer for \Iarl>k Can)on tribularie~.
<br />ma~ pnlVide more ctlt.'cljve results Ihan ....hen tilll,,\~ing pl'ri.lds of
<br />prolonged high dis.:harge (U.s. Depanment llflnlerinr, I (}"15), The
<br />I'N.lllood and 19")7 H\lF "ere assodal.:J ....ith largc IrihUlary inpuls
<br />ofsaod. The 1Q96 BHBF and lhl' ~O()O It\lF ,,'occufTed in the spring,
<br />"hen ~uspcnded lOand measurement.. sugge"llhal ITlhulary sand in pUIS
<br />ha\c be.;:n m,)<;II) nponcd from Ihe s)<slem n,'pping ct aI., ~Ill){)). ..\s
<br />a rcsult, during Ihe 1'J'13 IlnoJ. ~and con.:entrati'lIls in Grand Can)o-'lI1
<br />ranged from 310 6llmc\ higher Ihan Iho..... during thl' I ')C)(, BIIBF tRI'll'
<br />t.1 a/.. 1')<l7). During the 11\IF 11."'>IS in 1":197 and :!OO{)...and t.-'.>nl-clllrmK>ns
<br />in \farhlc Can~on ....cre aho.lullhe Same l n, lopping. USGS. re'" conl..
<br />~OOI), and onl~ slightly lo\~er than tho!>C ofthc 19'}6 BIlBF lTo.1Pping
<br />1.'1 al.. 20001_ Lnfoflullaldy, Ihe 1'")<)7 .1\IF ,lCCUfTl'd more Ihan a month
<br />alter cess.alion ofl'aria Ri\er llooding. olheN-ise Ihe s.and surpl~ would
<br />have been C(lnsiderabl~ grealer llla.rel el al., :::0001- I"l're "as linle
<br />
<br />A. . - _"" . ,
<br />,.. -
<br />~-.....- h.,>-- ;> ~ '
<br />~l ~-..--------,.~~ .........,...
<br />- 1~ "-
<br />t""'"". -~'.:
<br />.. .... ~ ---
<br />--. ~::..-
<br />
<br />
<br />Figure 3. Sfllected phOlog<aphs from the study sitflloeat&d .II river mile
<br />16," in Marble Canyon A Prv-1996 8HBF. B P~I.1996 BHBF. C. Post.
<br />1997 HMF. 0 Post.2000 ltIIHF. FlOw in main Channel is Irom lef'lto nght.
<br />
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<br />200 .00 &.00 aoo 1000 1100 1400
<br />"'ui......Oiscnargt!(m3lsl
<br />Figure 4, Average high~lfl...ation arv.t and volume changfl$ plott&d as a
<br />lunctlon of thfl maximum daily mean dISCharge. The Change between two
<br />successive surveys was seated by the maximum affla or volume observltd
<br />.II each sile. error bars are slandard error about Ihe mean.
<br />
<br />ditlerence in har resp.m~e het\"een Ihe It\f!" 1t.'SIS in 1947 and ~OOO
<br />(Fi~. -tl. In contra..I, Ihe 1C}t}J 1l,}t,>J huih lar~c hal'>. sho....ing that if
<br />....lIlJ .:on.::entr..li,)!1s arc high enough, nel dero~ilion will result from
<br />II\II:-t~ r>t.' 110\\5
<br />Our d,lIa dClllon..trall;' that sl'dimentation in cddie~ is al least as
<br />\erhili\c to Ill>\\ magnilude as sand \uppl~. tlecause .)flhc major role
<br />ofa.::comllJ,lliun ~p;\<:e 111 dClermining depu~llional liolullle and rille.
<br />rhe etTecl o.lf IImer 'ilnd ..uppl~ ':;in he olT..et h~ higher slages. The
<br />durali.," of high Il.)ws is considered les.. impc.nant hccallsc suspcnded-
<br />salld con central ion dC'crt'ased rapidl~ during e,l.::h of the eonlrolled
<br />rt'lcas.:s ( {"upping 1.'1 ::11., ~O()OI. and deposition rate~ ....crc highest during
<br />Ihe tiN .fa) or 1\\0 (Wide \'1 al.. I'l'~}). Fl,ms grealer Ihan po.l\\crplanl
<br />.:apa.:ily m;)~ Oe the ,mly means b~ \~hll'h en..,kd han; loan he mainlaint.-d
<br />,lr rd'uilt. cspccially If It'll-' reka\es \'annlll hI.' s.:ht.'dulcd c1oscl~ "ilh
<br />nc....l)' input.lrihutar:-surrlicd sand.
<br />
<br />~-m[~Iet.lOIi l;;:rn{;I.:IIIei~J.='1
<br />HazelJ. JE I,! Kaph""', R 1'."""11.( l.Ox"""" a<ldA 0.... 1999 Topo<;frapI>C:ana
<br />t>lolflyme1nCd'I.tI"ll~.I.,,!fty,II>"""ong-te<m51<Xly ~~S,!tl T~Cot1trT)/lfJ(1FIood,n
<br />GflmaC""l"Of'Gt!O,P/'IrsMonoQrSfff..o l'Oed'le<lbyRk'^"'t>b~aI.AGU
<br />-,..$tl."OlOn,OC p 16\-18<1
<br />HUttl JE J' I,! Kaphns>, R Pamoltl aMU Uanone 2O(X) Sand""pOMlOn"'_
<br />Cdotl>OO RIVer ecoo.y'lem Ir<>m ftOO<long 01/_ P....I'l~ _ iN' ~ecn.0I/ lI'>tl.."...
<br />1997. GlftflCar>yOfl Dam ,,"IFIoot F.....ReoortlOG<-aflClCa"YOflUor>~aflCl
<br />Re...artllCt!'fller'-lon~AnzOflaU"""FIag,"'''-A.r>ZOflaJ7PO
<br />ROle JJ \'IE FtY"",aflClOJ Sll. 1997 Hyct"*>Qot;d.ata COkI<It<lQR,......afldma/Of
<br />tnboJltIfIf!' Go.... CanyOfl Oam to Olamond CrH'" A.nlOfle "'al"'-~eaf$ '990--1~5
<br />tJSGeaIo;JcalSU~,()PCfll'...RI!CJOI197-2s.o"4po
<br />Toc>Ptrog OJ 0\'1 R"bon J\'I """1lOfl I'J ,,""'zelUI.an<lIC Cor'W>fl 2OO(l COkI<l>OO
<br />R'_se<l"""n'tran~2Sy""""'bC~..bOf>afldgra'I'>-""'''"",,"-oIIUn<l
<br />krpJIl,I""U10C11\'..."tR_ce.R........artll.J6"S4J-S60
<br />US Depa~ofln"'''''' 1995 ()pe<aI.onol/Gl""C.fl'QnOam-FmalEn~\;}I
<br />Impad SltIle.....fl' s." l..eC"" UltI~ 337 PO
<br />'NeieS\'I Grat,JB .afldJO Sm"", 1996 Sancl~po$'1IOn'''iN'ColofaooR~ofliN'
<br />Gf1"'dCanYOfl!rornl\oodongol/lt>e'lrmeCOlOraaoR,_ I'ital",R~ftleSR"se.n:t>
<br />,,36,,3579-3596
<br />""'-SM EO """'.-.anoERGn!lofl 1999 The""ec;tol/wfldconcefllrJl"""Ofl
<br />~'t..t"fn4I9'l'luOeanoloca""".,tt>eCOIOf'aOOR_'l:>trtcN.t""'lfl'lle
<br />COlOrado 1'1........ '" The Controled I'tood '" Grafl<l Canyon Geopn,. Uoo-ooo;Jr Ser
<br />'10 e<l~edl:PyRH """tltleu' "GU....~ DC P '31.'45
<br />
<br />. lot" I/a:.". ""ft lI:uf'Ii",I.;, Rod "/Jrndl ""d Hurl. Ham",..
<br />
<br />Funded by Grand C.nyon Mon"o"ng and R....rell Center
<br />
<br />For mo~ infor-mation. pie... contact u. at:
<br />Nonhem Aril"ona Um".,."y
<br />o.p.rtrmm' 0# GfJOIOgy
<br />ao.409ll'
<br />Flagal_". AZ 8't!IOU-40ll'll'
<br />hrtp'lIv..h"u gig nau edurgcmtCltnd.. hlmt
<br />
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