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<br />~
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<br />
<br />792
<br />
<br />HYDRAULIC ENGINEERING '94
<br />
<br />,qJz ." on lP- _(DOOoI3O)))IO,4
<br />(Ft.IFD)- flIIID 01 chg klrc8 III In kln:e (1lIl.........M$)
<br />. D.se In tNl!I lIIUdy (suggilsI8d by WIb8Ig and SmIIh (1987b))
<br />Komafo oquotIon (Komar (1987)) Is:
<br />
<br />'1.J' o.G4&(Rtlo./RhO) 9 OSO.'. 0:"
<br />
<br />~.co;::.. ":r~:1
<br />:':''':'=.:''oI'':::.''t''g.;l
<br />DeO. uaed 050._ 88dIment" (br number) for wNch 5O%oI1he""" CllfJ1:IfI9lng the bed ufec:8..
<br />-(em)
<br />D..- lllngIhofp8f1lcle's ..,..... II Ii ....(em)
<br />CrIlk:aI _ end ........ _ _ lor oach of the rocl<o _ moved U8Ing Itlo
<br />_ oql.IIllIon& n.._comporodwlhtheocluolvelocllyend _ranges__
<br />the lOCko, ond the error _the prodIcI8d end _vel... _ U81ngthe_
<br />E=SUM{((ACT-<:ALCI{ACT)'}, UoIng Ihlo orror onaiylIIs, Komafs roIoIIonohIp prodk:led
<br />__wlththe_ orror, E=1.0. HelIoy'loquotIon prodIcI8d crIIcoI boIlomwlocly
<br />with an error E-1,64, end WIberg end SmIth'l oquotIon forcrllk:al shoar _In on""", !
<br />of 1.8. AetuoI-vs-prodk:Ied crIlk:aI boIlom veloc111es lor the rocl<o _ moved 8f8 p10l1l1d In
<br />FIgure 2, end octuat-vs-predk e_ _ ......... 8f8 pIoIled In FIgure 3. '"-lPBPha
<br />"'- _ rocl<o m<Mt aI veloc11leo end.........hat _ _than predlcled duIfng IhsIQo
<br />rei...... ThIs coUd ...... -. due 10 IU_ now nucluallons wI1Ich _In_
<br />end ........ higher than the .......go&" IMBsurod end """"_, Some of the rocks Ihs
<br />moved aI hlgherftowo _ ...... -. dloploced by""""'" veloc111es end......... Tho bod
<br />pockol ondos of lh8s8 rocl<o (the anglo tf1rough which 0 rock has 10 turn 10 roll _ from
<br />lis loolglborv, anoIogous IOlhe orV8 of _) coUd...... -. hIghorthan _sd. Bed
<br />pockol ondos 8f8 _10 I118lIIUI8 __Illy, end 1_ _ not meosured 1orD*
<br />oxperlmont. 1_, Ihlo anglo W88 8811"_" 0 funcIIon of rock end sunoundlng portIde
<br />-,
<br />
<br />PREDICTED-va-ACTUAL VELOCITIES
<br />(HElLEY)
<br />
<br />ACTUAL
<br />BOTTOM
<br />VELOCITY
<br />(OI/a)
<br />
<br />1."
<br />1.2
<br />1
<br />
<br />... """,,,,,,,,,,;_,",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,8..0100-
<br />'.1
<br />....
<br />I
<br />'.2
<br />.
<br />.
<br />
<br />I
<br />...........;.~. ~.~.!~...m............................
<br />
<br />i
<br />
<br />---
<br />
<br />I
<br />
<br />. ..
<br />
<br />i
<br />
<br />a__
<br />
<br />'.5 1 1.5 2 2.5 3 3.5 .. ".5
<br />PREDICTED BOTTOM DELDCITY (OI/a)
<br />
<br />5
<br />
<br />FIgure 2
<br />
<br />.
<br />
<br />.
<br />
<br />THRESHOLDs-GRAVEL & COBBLE
<br />
<br />793
<br />
<br />PREDICTED-va-ACTUAL SHEARS
<br />
<br />ACTUAL
<br />SHUR
<br />(HI.')
<br />
<br />91
<br />u..__
<br />~: \/<.m'3Id_
<br />6' /
<br />/
<br />::............~..~
<br />
<br />2' ...;/.......00......
<br />11 /
<br />.
<br />.
<br />
<br />1...
<br />
<br />IIJUR .
<br />EG_ 0
<br />1IIIER\l....1III .
<br />
<br />......................2j..:.'Jliiiittff..
<br />~O 0......
<br />..............U.;;;:..l1t...
<br />
<br />jJ.
<br />
<br />I1w3/IeCRtlflle
<br />
<br />2'
<br />
<br />... 61 II
<br />PREDICTED SHEAR
<br />
<br />ill 12'
<br />(HI.')
<br />
<br />Agure 3
<br />
<br />CONCLUSIONS _. equation lor crIlIc8I _ W88 the ..- 10
<br />':;;~':~IIoI~Wm,the _.mount of error. M81::~t"==
<br />rred~ In Older to opply the equo1IonS :I'::~::':"'~;" -= end _'I equation)
<br />IcrlIlcoI sIloar). The"'r""~ the most quesIIonobIe oosumpUon applied, WIberg and
<br />~";."(~ a method 10 -.. opproxImaI8 the veIocIy ~~ 00::::
<br />IUlWsnco. dl8ll end lilt forces (epplIcallleIO bolh Holley ~ ~ wa.g .;00 $mIlh'1
<br />'r9BB (used In Halloy'l oquotIon), end "":!~u:...~ Fut1her Inform8tIon on
<br />r<I81IonshIp) ... necesoory In order to heIIer ......, . InlUoI motton can be
<br />poItk:to -"'" 6.0. poct<et or u1hnobdtvn OnglBB) and lis - on
<br />found In Komar end U (1988),
<br />
<br />~'":~~ lu.- thIo etudy. Thalr oupport Is graotIy _....Ia1ed.
<br />
<br />REFERENCES I\Ivar T\u1lShOIdllor Gravel end ~ MoIIon. Black
<br />ChllBo. _ J, (1992). 'GunnIson ,---,," MS Th8sIs. CoIo<ado _ UnIver8lly.
<br />Conyoo 01 tho Gunnison NatIonoI Mon..,-" .
<br />of the InlUa1Ion of Large Bad PartlcIe _In 81118
<br />Holley. E.J.. (1969). "F1oId M~~....... p_ 562.G
<br />Creole Noor _, CA", USGS P".~- .
<br />" Gravel Entra_ end the EmpIrtcaI EvoI_ of Row
<br />Komar, Poll D" (1987), - 6 1165 1176.
<br />Compo\8l1C8". _ology, vd. 34, no. ,pp, .
<br />
<br />Komsr, Pall 0, end Z. U, (1988), "~~~:~ :~~.:.
<br />SoIlellvo Enhalnmont 01 Gravel end 10 r~ ~'....-.- .
<br />35. no. 4. p. 681.
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