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<br /> - <br />.00630 <br /> ,\1odelling of und tkposltion In COfOfddo Ri"ef J71 <br />. ,,) B4ld"'valiOn(m) <br /> ~~ r <br /> - - <br /> e- 82. <br /> :!. 200 <br /> H : <br /> ~. '00 . <br /> u~ <br /> 00 100 200 ~ 000 500 600 700 "" .., <br /> o..nc.lrom ......(m) <br /> (0) Becl~.bon(ml <br /> F:~- r <br /> - <br /> 82. <br /> il.oo : <br /> u' <br /> 00 .00 200 ~ 000 500 "" 700 "" .., <br /> ~trotnlfMl(ml <br /> ") B4ldlievlllcn(m) <br /> ~ r <br /> -- <br /> e- 821 <br /> 2!.. 200 <br /> "i : <br /> j~ .00 <br />. 0 <br /> 0 '00 200 300 000 500 "" 700 800 .., <br /> C/IsIat'QlYtvninlM(m) <br /> <br />F;~ '4.6 Contour m.,Jf>> 01 the Io.bow LoJviJ Chuar redch d' 18JO~/J showing rid th(. <br />mit!dl bf!d morphology (,at rime:; OJ, (b) the model prediction .liter 11 hours with rM /()4N <br />/1983) s.Jnd supply dnddso= O.29mm, ilnci(cJ I~ model prediction ,)h~t J7 hours wirh thE- <br />high (1956) s..ndsuppJy,mddso=O.14mm. <br /> <br />U.6.1.1 -"IOthI pr~dkt;OIu <br /> <br />The taLaI cbange in sand deposit volume in the Above Lava Chuar reach was <br />negative for aU cases (Figures 14.5. 14.6 and 14.7) largely as a rtSult of erosion of the <br />u'nd deposit in the channel expansion marked A under aU combinations of disc-barge <br />and sand supply (Figure 14.8). The modelled erosion of tbe sand bar in A may, <br />in part. be a con~ucnce of the mood's functioning ....ith just one grain size. If the <br />initial sand <kposit wlthin the expansion wtt(' of signifKaIltly coarser material than <br />tbe modelled grain size. it would be more resistant to erosion. The combmation of <br />high djscbar~ and finest grain-size resulted in the most rapid erosion (Figure 14.8). <br />During the cOUC'SC' of thi.s erosion. bars that deflect flo.... towards the bank fonned <br />\l.ithin the expansIOn, multing in erosion of sand deposits along tbt bank. After the <br /> <br />. <br />