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<br />34 <br /> <br />..........-. <br /> <br />... - - - - ... <br /> <br />- - <br />. , <br /> <br />1 <br /> <br /> <br />j <br /> <br />--""'---,- <br />L'~"'" ."us <br /> <br />,-~-_._. <br /> <br />FICIiIlt 2. CnncIaued: Profilt~ af Snake Ri\'H and c.,.lullll';a Rivet. The <br />J.ongiNditlal profile (t.rom uppt:,r rt:ac~C:I to mouth) of I Sfrc~'ll ill T)'pll:ally <br />conclve to I,he shoo V'TllflOnS III erosIon nrn along the prnhle .c.:ounl for <br />the irrqrubmies. (After S\'h"u(er, R. 0.. 1958 "\\'I!cr Quali!y Studlu in the <br />Columb.. RinrBasin," U. S. FiJh.md WJ/Jf'ftSn"1.'. Spec. 5n. R~., No. 2J9.) <br /> <br />-'0/11 G. K. Reid. 1961. EcoJoaY of Inland lIlters and ESluarlel. <br />ChapteT J. Stream Channel. and Strea~8. P~Re 56. R~1nhold <br />Publishing Corporation, N~ york. pp.375. <br /> <br />in their temporary or long-term deposition on alluvial floodplains, deltas <br />etc. Therefore, many factors comb!ne to mnke it prob.ible that the general <br />si~e of the particles forming the gubstratl' will decrlaase in the downstream <br />direction. This s\Jbstrate compoa1\;ion atremgly influ4ances the nature of <br />the overall ecosystem and communit)' structure and func:tion. <br /> <br />T,bIe I. <br /> <br />Cl...ification of channel lub.tnte Mteri.U. <br /> <br />PARTICLE DIAMErsR <br /> <br />Helric Sy.telll Enllilh Synem Coll'lllon <br /> "" illehe. N._ <br />)O~ 12 O'r over Boulder <br />76.1 to 304.7 J t. 11.99 Rubble <br />4,' t. 76.0 0.185 to 2.99 Gravel <br />4.' 0.184 " It,.,. F'11l(' 5c<li....nt <br /> <br />Bars <br />- <br /> <br />When bed materials are carried, deposited and concentrated within the <br />stream channel, the localized accumulation initially gives the appearance <br />of a small island or bar that is especially noticeable during low flows. <br />1'b.''llt.aUnction between a .!!!!. .Ildan ielend 18 arbitrarily made on the <br />bash otilhort ten atabllity.;,'AIUl parenoial vegetation, Therefore an <br />