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<br />60 <br /> <br />San Dieguito River <br />Section 51 - looking upstream <br /> <br /> 50 <br />Qj 40 <br />~ <br />C <br />.2 <br />OJ <br />'" 30 <br />Gl <br />W <br /> 20 <br /> <br />10 <br /> <br />I <br />I <br />I <br />Flni~__-2__ ,..J ! <br />, I f <br /> <br />1..._..._...._._...1 ..-....... ._...J.-..._.! <br />. . \ <br />IT---\,--!-1 Final <br />Al peak flood \ ! <br />(T=66 hrs.) '-"-"A~er 1st flood <br />(T = 50 hrs.) <br />2200 <br /> <br />2000 <br /> <br />1800 <br /> <br />Slation, feet <br /> <br />FIG. 9.-SlmuI8l8d Croe..Secttonal ChlIngee lit Via da Senlll Fe Brtdge <br /> <br />A picture of the eroded concave bank is shown in Fig. 6. <br />River Channel Changes in Relation to Power Expenditure.-Changes <br />in river-channel configuration are accompanied by changes in flow re- <br />sistance and hence the rate of energy (or power) expenditure. The .,QS <br />product represents the rate of energy expenditure per unit channel length. <br />Since the spatial variation of Q is small, the spatial variation of 'YQS may <br />be represented by the spatial variation of the energy gradient S shown <br />in Fig. 7. <br /> <br />45 <br /> <br />At peak flood San DieguilO River <br />1; "-..... (T=66 hrs.).. Section 46 - looking upstream <br />.S! 35 -'\ -I"'tia~_________ <br />g , \ ,. <br />~ \.. \ \ -. :'.~fC-...:~:."""""""""~" <br />Q) 25 \'-"-"-'''-'c::~' ...' '- <br />w ~ ~) <br />Final \............ 'Aller 1st flood <br />(1=140 hrs.) (T=50 hrs.) <br />15 900 1000 1100 1200 1300 1400 1500 <br /> <br />Station, feet <br /> <br />FIG. 10.-Slmulaled Cross-SectIonal Changes .1 Sacllon 48 Showing Lateral MI- <br />gration Toward 1he Concave Bank <br /> <br />1600 <br /> <br />168 <br /> <br />17 <br />