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<br />
<br />.
<br />
<br />794
<br />
<br />HYDRAULIC ENGINEERING '94
<br />
<br />WIberg, P_ L and J.D. SmIIh, (19870), "CeIcUaI1ons ollhe CrItical S_ _ for
<br />MotIon ol Unlfonn and ~_ Sediments', Water IIeoourceo Reoeor<:Il, vol, 23, no.
<br />8, p. 1471-1480, August, 1987.
<br />WIberg, Patricia L and J.D. SmIth, (l987b). 'IniIIaI Mallon 01 eoa.... SedIment In S1reama d
<br />High Gradient". Erosion and Sed_In lhe P_ Rim, ProceOOIngs ollhe CoowII~
<br />S\'lfIIlO8I<Jm. AugusI. 1987, lAMS PubI. no. 165,
<br />Wbfg. Patricia L and J.D. Smflh. (l987c). "VelocfIy Dlslrfl>utlonand Bad R~In~
<br />Gradtant Sir......., Watar Resources R....rch, vel, 27, no. 5, pp. 825- 838, May 1981.
<br />
<br />
<br />UST OF VAAIARlII=~
<br />A Iangth ol partIcIa'. axis paJ8llellO IIow (m)
<br />B I~ ol --.. Olds JHII1lllndIc:Ua 10 IIow (m)
<br />C I~ ol particle'. ver1IcaI axis (m)
<br />SM I~ olllhort Olds ol rrtlcle (m)
<br />G long axis 01 partIcIa (m
<br />Om Intennadlala Olds 01 partlcle (m)
<br />C', modllod dmg coalIIcIant (_ass)
<br />z ftow depIh at..... ollnt....., measured down \rOm watar _ (m)
<br />D. lhel sedIman 8Iza lor which 50% ol parUcIas comprtsIng lhe bad surface are........ (m)
<br />9 acceI_ ol gnMIy (m/sac' )
<br />F, dmg force (N)
<br />F 11ft force (N)
<br />K von Karman'. con_, K . 0.407 (_)
<br />k, bad roughneas (m)
<br />, partlcla radius (m)
<br />Rho density ol_ (glom' )
<br />Rho densIly ollhe partIcIa (glom'I
<br />R ~ralJllc radius ol channel, R . AJP (m)
<br />S energy slopa (mfm)
<br />sp spocIftc gravly ol watar (dl_)
<br />SP. spacIftc gravly ol_ (d_)
<br />_ spacIlIc weight 01 water (Nfrr\' )
<br />_. spacIlIc weight 01 sedImanl (Nfm' )
<br />v, mean IIow velocfIy (mfsee)
<br />Z. zero IaveI ol bad. tal<en 10 be lhe mean I"" ollhe conte.. ollhe grains ccrnprIoIng!to
<br />bad surface (m)
<br />. coelflc\enl describing grain geometry (dimensionless)
<br />. bedslopa (mfm)
<br />T bad shear (N/rr\' )
<br />Ta critical shear, or lhe _est shear lhel wII move a particle ola given 8Iza (Nfm' )
<br />T..dlmenslonless crIllceI shea, stress. '[~ = '[a f((sp, "'" )D,)
<br />. bad pock" engIe (dog'...)
<br />a _Ion axls. the engIe olthe particle's long axis wtth the hoIIzonlBl (degteos)
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<br />
<br />SOKB BBNEFITS OF GRID BY
<br />Davi4 Crowderl and Panayiotis
<br />
<br />NUIIBER SAMPLING
<br />Diplas,2 Member, AseE
<br />
<br />A~:Jtract
<br />
<br />Describing the overall .
<br />gravel-bed river reach sedlment composition
<br />dit~icult problem due e; and d,epositional bars is of
<br />sedIment size. Past 0 spatIal variations in a
<br />obt<\in,ing an unbiased ~~sleuamrCth .has focused largely tohne
<br /><\t a slngl. , e rlcally e '
<br />, ~ pOlnt, however littl qUI valent sample
<br />
<br />~~;~:~:~F~:!~/~::%;i~ ~:f~~:~ l~~i:S::~;::i:S~~:I~JEr
<br />
<br />pOSSlblllty of extendi ,are 91.ven here
<br />~~~~r~:: ~~a~~~lllY heter~~e,{:ulsd m:{er~~~~e:i 1 slabmpibin.9 T~~
<br />. e rlefly
<br />
<br />In~rOduction
<br />
<br />, Being able to mOr
<br />1.('0.1 s overall sedi e accUrately describe a
<br />',r Oar WOuld b b meI?t .com~osition \tIithin . gravel-
<br />t JON depth ande en~flclal 1n two important ~ rIver ~each
<br />j 1l't1icted. sed1ment transport rate ays. Fl.rst,
<br />~'Jle dist:t:::i;~ey are dependent On as r~~~;~sbe b~tter
<br />.lfl.1dromous fish ~nd se~ond, ecological habit~~dll1l~nt
<br />I.I.t tcr mooi tored for t:: ~ngereci mUssel species c~n ~r
<br />Increase of fines Whl'ch . e
<br />1mpacts
<br />
<br />1
<br />Graduate Stud~ t
<br />: n'llneering, Vir in,n , Department of CiVil
<br />nlversity Blackg bla Polytechnic Institute
<br />, s urg, VA 24060 and State
<br />
<br />2
<br />;', Associate Prote
<br />'''llneering Virgi . Ssor, Depat'tment of Civil
<br />
<br />r'l'Jersity,' 81aCks~~~g~O~rt~~~~~c Institute and State
<br />
<br />795
<br />
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